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[10-Q] Tecogen Inc. Quarterly Earnings Report

Filing Impact
(Moderate)
Filing Sentiment
(Neutral)
Form Type
10-Q
Rhea-AI Filing Summary

Tecogen Inc. reported consolidated revenues of $14.57 million for the six months ended June 30, 2025, up from $10.91 million a year earlier, driven by a large increase in Products revenue to $5.69 million (prior $1.61 million) while Services remained roughly steady at $8.21 million and Energy Production declined to $0.67 million.

Gross profit rose to $5.68 million and consolidated net loss improved to $2.13 million for the six months (loss attributable to Tecogen $2.12 million, $(0.08) per share basic), compared with larger losses a year earlier. Cash and cash equivalents declined to $1.64 million from $5.41 million at year-end and operating activities used $3.78 million of cash in the first half. Acquisition-related contingent consideration and related liabilities tied to the Aegis maintenance acquisition carry a fair-value liability of about $1.25 million. Subsequent to the period, the company completed a public offering raising approximately $18.16 million net proceeds to fund growth and working capital.

Tecogen Inc. ha registrato ricavi consolidati di $14.57 million per i sei mesi terminati il 30 giugno 2025, in aumento rispetto a $10.91 million dell'anno precedente, sostenuti da un forte incremento dei ricavi da Prodotti a $5.69 million (precedente $1.61 million), mentre i Servizi sono rimasti sostanzialmente stabili a $8.21 million e la Produzione di Energia è calata a $0.67 million.

Il profitto lordo è salito a $5.68 million e la perdita netta consolidata si è ridotta a $2.13 million per i sei mesi (perdita attribuibile a Tecogen $2.12 million, $(0.08) per azione di base), rispetto a perdite maggiori nello stesso periodo dell'anno precedente. Le disponibilità liquide e gli equivalenti sono diminuite a $1.64 million da $5.41 million a fine anno e le attività operative hanno assorbito $3.78 million di cassa nella prima metà dell'anno. La contropartita condizionata e le passività correlate legate all'acquisizione del ramo manutenzione Aegis presentano una passività a fair value di circa $1.25 million. Successivamente al periodo, la società ha completato un'offerta pubblica raccogliendo circa $18.16 million di proventi netti per finanziare la crescita e il capitale circolante.

Tecogen Inc. registró ingresos consolidados de $14.57 million en los seis meses terminados el 30 de junio de 2025, frente a $10.91 million un año antes, impulsados por un gran incremento en los ingresos por Productos hasta $5.69 million (antes $1.61 million), mientras que los Servicios se mantuvieron aproximadamente estables en $8.21 million y la Producción de Energía descendió a $0.67 million.

El beneficio bruto aumentó a $5.68 million y la pérdida neta consolidada mejoró hasta $2.13 million en los seis meses (pérdida atribuible a Tecogen $2.12 million, $(0.08) por acción básica), comparado con pérdidas mayores un año antes. El efectivo y equivalentes disminuyeron a $1.64 million desde $5.41 million a cierre del ejercicio y las actividades operativas consumieron $3.78 million de efectivo en la primera mitad. La contraprestación contingente relacionada con la adquisición de mantenimiento de Aegis y las pasivos vinculados reflejan un pasivo a valor razonable de aproximadamente $1.25 million. Tras el periodo, la compañía completó una oferta pública que recaudó aproximadamente $18.16 million de ingresos netos para financiar crecimiento y capital de trabajo.

Tecogen Inc.ëŠ� 2025ë…� 6ì›� 30ì� 종료ë� 6개월 ë™ì•ˆ 통합 ë§¤ì¶œì•¡ì´ $14.57 million으로 ì „ë…„ì� $10.91 millionì—서 ì¦ê°€í–ˆë‹¤ê³� 보고했습니다. ì´ëŠ” 제품 매출ì� $5.69 million(종전 $1.61 million)으로 í¬ê²Œ 늘어ë‚� ë� 따른 것ì´ë©�, 서비ìŠ� ë§¤ì¶œì€ ì•� $8.21 million으로 대체로 유지ë˜ê³  ì—너지 ìƒì‚°ì€ $0.67 millionë¡� ê°ì†Œí–ˆìŠµë‹ˆë‹¤.

ì´ì´ìµì€ $5.68 million으로 ì¦ê°€í–ˆê³  통합 순ì†ì‹¤ì€ 6개월 기준 $2.13 million으로 개선ë˜ì—ˆìŠµë‹ˆë‹�(í…Œì½”ì  ì— ê·€ì†ë˜ëŠ� ì†ì‹¤ $2.12 million, 주당 기본 $(0.08)). 현금 ë°� 현금성ìžì‚°ì€ 기ë§ì� $5.41 millionì—서 $1.64 million으로 ê°ì†Œí–ˆìœ¼ë©� ì˜ì—…활ë™ì€ ìƒë°˜ê¸°ì— $3.78 millionì� 현금ì� 사용했습니다. Aegis 유지보수 ì¸ìˆ˜ì™€ ê´€ë ¨ëœ ì¸ìˆ˜ ê´€ë � ìš°ë°œ 지급액 ë°� ì—°ê´€ 부채는 ì•� $1.25 millionì� 공정가ì¹� 부채를 ë°˜ì˜í•©ë‹ˆë‹�. 기간 ì´í›„ 회사ëŠ� 공개 모집ì� 통해 ì•� $18.16 millionì� 순수ìµì„ 조달하여 성장ê³� ìš´ì „ìžë³¸ì—� 사용í•� 예정입니ë‹�.

Tecogen Inc. a déclaré des revenus consolidés de $14.57 million pour les six mois clos le 30 juin 2025, contre $10.91 million un an plus tôt, portés par une forte hausse des revenus Produits à $5.69 million (±è°ù鳦é»å±ð³¾³¾±ð²Ô³Ù $1.61 million), tandis que les Services sont restés à peu près stables à $8.21 million et la Production d'Énergie a diminué à $0.67 million.

La marge brute a augmenté à $5.68 million et la perte nette consolidée s'est améliorée à $2.13 million pour les six mois (perte attribuable à Tecogen $2.12 million, $(0.08) par action de base), comparé à des pertes plus importantes l'année précédente. Les liquidités et équivalents ont diminué à $1.64 million contre $5.41 million à la clôture de l'exercice, et les activités d'exploitation ont consommé $3.78 million de trésorerie au cours du premier semestre. La contrepartie conditionnelle liée à l'acquisition de la maintenance d'Aegis et les passifs connexes affichent une passivité à la juste valeur d'environ $1.25 million. Après la période, la société a réalisé une offre publique levant environ $18.16 million de produit net pour financer la croissance et le fonds de roulement.

Tecogen Inc. meldete für die sechs Monate zum 30. Juni 2025 konsolidierte Umsatzerlöse von $14.57 million, gegenüber $10.91 million ein Jahr zuvor. Treiber war ein deutlicher Anstieg der Produktumsätze auf $5.69 million (zuvor $1.61 million), während die Dienstleistungen mit rund $8.21 million annähernd unverändert blieben und die Energieproduktion auf $0.67 million ³ú³Ü°ùü³¦°ì²µ¾±²Ô²µ.

Der Bruttogewinn stieg auf $5.68 million, und der konsolidierte Nettoverlust verbesserte sich auf $2.13 million für das Halbjahr (auf Tecogen entfallender Verlust $2.12 million, $(0.08) je Aktie/Grundlage), verglichen mit höheren Verlusten im Vorjahr. Zahlungsmittel und Zahlungsmitteläquivalente gingen von $5.41 million zum Jahresende auf $1.64 million zurück, und die operative Tätigkeit verwendete in der ersten Jahreshälfte $3.78 million an Zahlungsmitteln. Eine erwerbsbezogene Eventualverbindlichkeit und damit verbundene Verbindlichkeiten im Zusammenhang mit der Übernahme des Aegis-Wartungsgeschäfts weisen eine Fair-Value-Verbindlichkeit von etwa $1.25 million auf. Nach Periodenende schloss das Unternehmen eine öffentliche Platzierung ab und erzielte netto rund $18.16 million, um Wachstum und Betriebskapital zu finanzieren.

Positive
  • Total revenues increased to $14.57M for the six months ended June 30, 2025 from $10.91M a year earlier.
  • Products revenue surged to $5.69M (prior $1.61M), driven by chiller and product sales.
  • Gross profit improved to $5.68M, reflecting higher product sales and overall margin expansion.
  • Net loss narrowed to consolidated $2.13M for six months (loss attributable to Tecogen $2.12M, $0.08 per share basic) versus larger prior-year losses.
  • Subsequent equity offering raised estimated net proceeds of approximately $18.16M, materially bolstering liquidity.
Negative
  • Operating cash outflow of $3.78M for the six months ended June 30, 2025 indicative of cash burn.
  • Cash and cash equivalents declined$1.64M at June 30, 2025 from $5.41M at December 31, 2024 prior to the offering.
  • Consolidated net loss persisted$2.13M for the six months, showing the company remains unprofitable year-to-date.
  • Acquisition-related contingent consideration$1.25M as of June 30, 2025.
  • Related-party financing$1.07M as of June 30, 2025, reflecting continued insider lending and exposure.

Insights

Revenue growth and narrower loss, but pre-offering cash burn created near-term liquidity pressure.

Tecogen's H1 2025 results show meaningful top-line expansion, led by a jump in Products revenue (notably chiller sales) and higher gross profit margin year-over-year. Operating loss narrowed to $2.01 million and consolidated net loss improved to $2.13 million for six months, or $0.08 per share basic versus $0.11 last year, indicating operating progress. However, operating cash used $3.78 million and cash on hand was only $1.64 million at June 30, 2025 prior to the subsequent equity raise. The July follow-on offering (net proceeds ~$18.16M) materially improves near-term liquidity and capacity to invest in product development and commercial expansion. Overall, operational trends are positive; liquidity profile was strained pre-offering but is substantially addressed by the raise.

Improved operating results offset by continued losses, contingent liabilities, and related-party debt exposure.

Key risk elements in the filing include: recurring net losses (H1 consolidated loss $2.13M), negative operating cash flow ($3.78M used), and acquisition-related contingent consideration and deferred maintenance reserves with a combined carrying amount (~$1.25M contingent consideration plus deferred maintenance reserves disclosed in acquisition liabilities). Related-party notes remain on the balance sheet (note balance to Mr. Hatsopoulos reclassified to long-term at $1.07M at June 30, 2025) although one related-party note converted to equity during the period. These items create execution and liquidity risk should operating improvements slow. The subsequent equity offering mitigates immediate funding risk but raises potential dilution and lock-up considerations for insiders and holders.

Tecogen Inc. ha registrato ricavi consolidati di $14.57 million per i sei mesi terminati il 30 giugno 2025, in aumento rispetto a $10.91 million dell'anno precedente, sostenuti da un forte incremento dei ricavi da Prodotti a $5.69 million (precedente $1.61 million), mentre i Servizi sono rimasti sostanzialmente stabili a $8.21 million e la Produzione di Energia è calata a $0.67 million.

Il profitto lordo è salito a $5.68 million e la perdita netta consolidata si è ridotta a $2.13 million per i sei mesi (perdita attribuibile a Tecogen $2.12 million, $(0.08) per azione di base), rispetto a perdite maggiori nello stesso periodo dell'anno precedente. Le disponibilità liquide e gli equivalenti sono diminuite a $1.64 million da $5.41 million a fine anno e le attività operative hanno assorbito $3.78 million di cassa nella prima metà dell'anno. La contropartita condizionata e le passività correlate legate all'acquisizione del ramo manutenzione Aegis presentano una passività a fair value di circa $1.25 million. Successivamente al periodo, la società ha completato un'offerta pubblica raccogliendo circa $18.16 million di proventi netti per finanziare la crescita e il capitale circolante.

Tecogen Inc. registró ingresos consolidados de $14.57 million en los seis meses terminados el 30 de junio de 2025, frente a $10.91 million un año antes, impulsados por un gran incremento en los ingresos por Productos hasta $5.69 million (antes $1.61 million), mientras que los Servicios se mantuvieron aproximadamente estables en $8.21 million y la Producción de Energía descendió a $0.67 million.

El beneficio bruto aumentó a $5.68 million y la pérdida neta consolidada mejoró hasta $2.13 million en los seis meses (pérdida atribuible a Tecogen $2.12 million, $(0.08) por acción básica), comparado con pérdidas mayores un año antes. El efectivo y equivalentes disminuyeron a $1.64 million desde $5.41 million a cierre del ejercicio y las actividades operativas consumieron $3.78 million de efectivo en la primera mitad. La contraprestación contingente relacionada con la adquisición de mantenimiento de Aegis y las pasivos vinculados reflejan un pasivo a valor razonable de aproximadamente $1.25 million. Tras el periodo, la compañía completó una oferta pública que recaudó aproximadamente $18.16 million de ingresos netos para financiar crecimiento y capital de trabajo.

Tecogen Inc.ëŠ� 2025ë…� 6ì›� 30ì� 종료ë� 6개월 ë™ì•ˆ 통합 ë§¤ì¶œì•¡ì´ $14.57 million으로 ì „ë…„ì� $10.91 millionì—서 ì¦ê°€í–ˆë‹¤ê³� 보고했습니다. ì´ëŠ” 제품 매출ì� $5.69 million(종전 $1.61 million)으로 í¬ê²Œ 늘어ë‚� ë� 따른 것ì´ë©�, 서비ìŠ� ë§¤ì¶œì€ ì•� $8.21 million으로 대체로 유지ë˜ê³  ì—너지 ìƒì‚°ì€ $0.67 millionë¡� ê°ì†Œí–ˆìŠµë‹ˆë‹¤.

ì´ì´ìµì€ $5.68 million으로 ì¦ê°€í–ˆê³  통합 순ì†ì‹¤ì€ 6개월 기준 $2.13 million으로 개선ë˜ì—ˆìŠµë‹ˆë‹�(í…Œì½”ì  ì— ê·€ì†ë˜ëŠ� ì†ì‹¤ $2.12 million, 주당 기본 $(0.08)). 현금 ë°� 현금성ìžì‚°ì€ 기ë§ì� $5.41 millionì—서 $1.64 million으로 ê°ì†Œí–ˆìœ¼ë©� ì˜ì—…활ë™ì€ ìƒë°˜ê¸°ì— $3.78 millionì� 현금ì� 사용했습니다. Aegis 유지보수 ì¸ìˆ˜ì™€ ê´€ë ¨ëœ ì¸ìˆ˜ ê´€ë � ìš°ë°œ 지급액 ë°� ì—°ê´€ 부채는 ì•� $1.25 millionì� 공정가ì¹� 부채를 ë°˜ì˜í•©ë‹ˆë‹�. 기간 ì´í›„ 회사ëŠ� 공개 모집ì� 통해 ì•� $18.16 millionì� 순수ìµì„ 조달하여 성장ê³� ìš´ì „ìžë³¸ì—� 사용í•� 예정입니ë‹�.

Tecogen Inc. a déclaré des revenus consolidés de $14.57 million pour les six mois clos le 30 juin 2025, contre $10.91 million un an plus tôt, portés par une forte hausse des revenus Produits à $5.69 million (±è°ù鳦é»å±ð³¾³¾±ð²Ô³Ù $1.61 million), tandis que les Services sont restés à peu près stables à $8.21 million et la Production d'Énergie a diminué à $0.67 million.

La marge brute a augmenté à $5.68 million et la perte nette consolidée s'est améliorée à $2.13 million pour les six mois (perte attribuable à Tecogen $2.12 million, $(0.08) par action de base), comparé à des pertes plus importantes l'année précédente. Les liquidités et équivalents ont diminué à $1.64 million contre $5.41 million à la clôture de l'exercice, et les activités d'exploitation ont consommé $3.78 million de trésorerie au cours du premier semestre. La contrepartie conditionnelle liée à l'acquisition de la maintenance d'Aegis et les passifs connexes affichent une passivité à la juste valeur d'environ $1.25 million. Après la période, la société a réalisé une offre publique levant environ $18.16 million de produit net pour financer la croissance et le fonds de roulement.

Tecogen Inc. meldete für die sechs Monate zum 30. Juni 2025 konsolidierte Umsatzerlöse von $14.57 million, gegenüber $10.91 million ein Jahr zuvor. Treiber war ein deutlicher Anstieg der Produktumsätze auf $5.69 million (zuvor $1.61 million), während die Dienstleistungen mit rund $8.21 million annähernd unverändert blieben und die Energieproduktion auf $0.67 million ³ú³Ü°ùü³¦°ì²µ¾±²Ô²µ.

Der Bruttogewinn stieg auf $5.68 million, und der konsolidierte Nettoverlust verbesserte sich auf $2.13 million für das Halbjahr (auf Tecogen entfallender Verlust $2.12 million, $(0.08) je Aktie/Grundlage), verglichen mit höheren Verlusten im Vorjahr. Zahlungsmittel und Zahlungsmitteläquivalente gingen von $5.41 million zum Jahresende auf $1.64 million zurück, und die operative Tätigkeit verwendete in der ersten Jahreshälfte $3.78 million an Zahlungsmitteln. Eine erwerbsbezogene Eventualverbindlichkeit und damit verbundene Verbindlichkeiten im Zusammenhang mit der Übernahme des Aegis-Wartungsgeschäfts weisen eine Fair-Value-Verbindlichkeit von etwa $1.25 million auf. Nach Periodenende schloss das Unternehmen eine öffentliche Platzierung ab und erzielte netto rund $18.16 million, um Wachstum und Betriebskapital zu finanzieren.

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UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, DC 20549
 
FORM 10-Q
QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
For the quarterly period ended June 30, 2025
TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

Commission file number 001-36103

Clean Energy Solutions.jpg
TECOGEN INC.
(Exact name of Registrant as Specified in its Charter)
Delaware04-3536131
(State or Other Jurisdiction of Incorporation or Organization)(IRS Employer Identification No.)
76 Treble Cove Road, Building 1
North Billerica, Massachusetts 01862
(Address of Principal Executive Offices and Zip Code)
(781) 466-6400
(Registrant's Telephone Number, Including Area Code)
Securities registered pursuant to Section 12(b) of the Act:
Title of Each Class        Trading Symbol        Name of Each Exchange on Which Registered
Common Stock, $0.001 par value per share     TGEN         NYSE American LLC
Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. Yes ý No ¨
Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit such files). Yes ý No ¨
Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company or an emerging growth company. See the definitions of “large accelerated filer”, “accelerated filer”, “smaller reporting company” and "emerging growth company" in Rule 12b-2 of the Exchange Act.
Large accelerated filer          Accelerated filer         o
Non–Accelerated Filer          Smaller reporting company     
Emerging growth company     
If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ¨
Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Act).Yes No ý
As of August 12, 2025, 29,690,798 shares of common stock, $0.001 par value per share, of the registrant were issued and outstanding.


TECOGEN INC.




QUARTERLY REPORT ON FORM 10-Q
FOR THE PERIOD ENDED JUNE 30, 2025
TABLE OF CONTENTS
 
PART I - FINANCIAL INFORMATION
Item 1.
Financial Statements
Condensed Consolidated Balance Sheets (Unaudited)
June 30, 2025 and December 31, 2024
1
Condensed Consolidated Statements of Operations (Unaudited)
Three Months Ended June 30, 2025 and 2024
2
Condensed Consolidated Statements of Operations (Unaudited)
Six Months Ended June 30, 2025 and 2024
3
Condensed Consolidated Statements of Stockholders' Equity (Unaudited)
Three and Six Months Ended June 30, 2025 and 2024
4
Condensed Consolidated Statements of Cash Flows (Unaudited)
Three and Six Months Ended June 30, 2025 and 2024
5
Notes to Unaudited Condensed Consolidated Financial Statements
6
Item 2.
Management’s Discussion and Analysis of Financial Condition and Results of Operations
25
Item 3.
Quantitative and Qualitative Disclosures About Market Risk
36
Item 4.
Controls and Procedures
37
PART II - OTHER INFORMATION
Item 1.
Legal Proceedings
37
Item 1A.
Risk Factors
38
Item 2.
Unregistered Sales of Equity Securities and Use of Proceeds
38
Item 3.
Defaults in Senior Securities
38
Item 4.
Mine Safety Disclosures
38
Item 5.
Other Information
39
Item 6.
Exhibits
40
Signatures
Signature Page
41

References in this Form 10-Q to "we", "us", "our"', the "Company" and "Tecogen" refers to Tecogen Inc. and its consolidated subsidiaries, unless otherwise noted.


TECOGEN INC.




PART I - FINANCIAL INFORMATION
Item 1 - Financial Statements

CONDENSED CONSOLIDATED BALANCE SHEETS
(unaudited)
 June 30, 2025December 31, 2024
ASSETS
Current assets:
Cash and cash equivalents$1,640,864 $5,405,233 
Accounts receivable, net6,640,483 6,026,545 
Inventories, net9,679,229 9,634,005 
Unbilled revenue126,738 398,898 
Prepaid and other current assets949,256 680,565 
Total current assets19,036,570 22,145,246 
Long-term assets:
Property, plant and equipment, net1,820,059 1,738,036 
Right-of-use assets - operating leases1,728,780 1,730,358 
Right-of-use assets - finance leases933,671 452,390 
Intangible assets, net2,330,959 2,513,189 
Goodwill2,346,566 2,346,566 
Other assets155,232 166,474 
TOTAL ASSETS$28,351,837 $31,092,259 
LIABILITIES AND STOCKHOLDERS’ EQUITY
Current liabilities:
Related party notes, current portion$ $1,548,872 
Accounts payable4,946,218 4,142,678 
Accrued expenses2,976,211 2,890,886 
Deferred revenue, current portion4,420,644 6,701,131 
Operating lease obligations, current portion481,891 430,382 
Finance lease obligations, current portion173,362 85,646 
Acquisition liabilities, current portion883,541 902,552 
Unfavorable contract liability, current portion83,962 113,449 
Total current liabilities13,965,829 16,815,596 
Long-term liabilities:
Related party notes, net of current portion1,067,848  
Deferred revenue, net of current portion1,252,831 1,165,951 
Operating lease obligations, net of current portion1,295,450 1,341,789 
Finance lease obligations, net of current portion675,198 325,235 
Acquisition liabilities, net of current portion878,151 1,008,760 
Unfavorable contract liability, net of current portion275,079 309,390 
Total liabilities19,410,386 20,966,721 
Commitments and contingencies
Stockholders’ equity:
Tecogen Inc. stockholders’ equity:
Common stock, $0.001 par value; 100,000,000 shares authorized; 25,571,490 issued and outstanding at June 30, 2025 and 24,950,261 shares issued and outstanding at December 31, 2024
25,571 24,950 
Additional paid-in capital58,837,181 57,845,289 
Accumulated deficit(49,763,921)(47,639,894)
Total Tecogen Inc. stockholders’ equity9,098,831 10,230,345 
Non-controlling interest(157,380)(104,807)
Total stockholders’ equity8,941,451 10,125,538 
TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY$28,351,837 $31,092,259 
 The accompanying notes are an integral part of these condensed consolidated financial statements. 


TECOGEN INC.




CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS
(unaudited)
Three Months Ended
 June 30, 2025June 30, 2024
Revenues
Products$3,155,323 $119,673 
Services3,965,168 4,126,517 
Energy production174,329 481,597 
Total revenues7,294,820 4,727,787 
Cost of sales
Products2,232,155 171,982 
Services2,469,737 2,191,815 
Energy production130,436 284,835 
Total cost of sales4,832,328 2,648,632 
Gross profit2,462,492 2,079,155 
Operating expenses:
General and administrative3,091,175 2,897,993 
Selling514,735 405,277 
Research and development268,724 246,489 
(Gain) loss on disposition of assets(280)3,363 
Total operating expenses3,874,354 3,553,122 
Loss from operations(1,411,862)(1,473,967)
Other income (expense)
Other income (expense), net(6,378)18,894 
Interest expense(38,153)(17,869)
Unrealized loss on investment securities (37,497)
Total other income (expense), net(44,531)(36,472)
Loss before provision for state income taxes(1,456,393)(1,510,439)
Provision for state income taxes16,762 37 
Consolidated net loss(1,473,155)(1,510,476)
(Income) loss attributable to the non-controlling interest9,050 (28,320)
Loss attributable to Tecogen Inc.$(1,464,105)$(1,538,796)
Net loss per share - basic$(0.06)$(0.06)
Weighted average shares outstanding - basic25,250,217 24,850,261 
Net loss per share - diluted$(0.06)$(0.06)
Weighted average shares outstanding - diluted25,250,217 24,850,261 
 
The accompanying notes are an integral part of these condensed consolidated financial statements.

2

TECOGEN INC.





CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS
(unaudited)


Six Months Ended
June 30, 2025June 30, 2024
Revenues
Products$5,689,132 $1,611,071 
Services8,210,190 8,140,827 
Energy production673,268 1,161,985 
Total revenues14,572,590 10,913,883 
Cost of sales
Products3,719,905 1,221,525 
Services4,728,635 4,284,072 
Energy production440,518 753,475 
Total cost of sales8,889,058 6,259,072 
Gross profit5,683,532 4,654,811 
Operating expenses:
General and administrative6,019,310 5,746,559 
Selling1,109,216 934,946 
Research and development561,392 501,185 
Gain on sale of assets(280)(4,028)
Total operating expenses7,689,638 7,178,662 
Loss from operations(2,006,106)(2,523,851)
Other income (expense)
Other income (expense), net(20,623)3,147 
Interest expense(70,479)(36,539)
Unrealized loss on investment securities(18,749)(18,749)
Total other income (expense), net(109,851)(52,141)
Loss before provision for state income taxes(2,115,957)(2,575,992)
Provision for state income taxes17,687 22,100 
Consolidated net loss(2,133,644)(2,598,092)
(Income) loss attributable to non-controlling interest9,617 (45,671)
Net loss attributable to Tecogen Inc.$(2,124,027)$(2,643,763)
Net loss per share - basic $(0.08)$(0.11)
Weighted average shares outstanding - basic25,103,388 24,850,261 
Net loss per share - diluted$(0.08)$(0.11)
Weighted average shares outstanding - diluted25,103,388 24,850,261 

The accompanying notes are an integral part of these condensed consolidated financial statements
3

TECOGEN INC.





CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY
For the Three and Six Months June 30, 2025 and 2024
(unaudited)
Three Months ended June 30, 2025Common Stock Shares
Common Stock $0.001 Par Value
Additional
Paid-In
Capital
Accumulated
Deficit
Non-controlling
Interest
Total
Balance at March 31, 202524,985,261 $24,985 $57,924,587 $(48,299,816)$(138,263)$9,511,493 
Exercise of stock options345,973 346 356,080 — — 356,426 
Related party note conversion to common stock240,256 240 513,908 — — 514,148 
Distributions to non-controlling interest— — — — (10,067)(10,067)
Stock-based compensation expense— — 42,606 — — 42,606 
Net loss— — — (1,464,105)(9,050)(1,473,155)
Balance at June 30, 202525,571,490 $25,571 $58,837,181 $(49,763,921)$(157,380)$8,941,451 
Six Months ended June 30, 2025Common Stock Shares
Common Stock $0.001 Par Value
Additional
Paid-In
Capital
Accumulated
Deficit
Non-controlling
Interest
Total
Balance at December 31, 202424,950,261 $24,950 $57,845,289 $(47,639,894)$(104,807)$10,125,538 
Exercise of stock options380,973 381 394,545 — — 394,926 
Related party note conversion to common stock240,256 240 513,908 — — 514,148 
Distributions to non-controlling interest— — — — (42,956)(42,956)
Stock-based compensation expense— — 83,439 — — 83,439 
Net loss— — — (2,124,027)(9,617)(2,133,644)
Balance at June 30, 202525,571,490 $25,571 $58,837,181 $(49,763,921)$(157,380)$8,941,451 
Three Months ended June 30, 2024Common Stock Shares
Common Stock $0.001 Par Value
Additional
Paid-In
Capital
Accumulated
Deficit
Non-controlling
Interest
Total
Balance at March 31, 202424,850,261 $24,850 $57,645,936 $(43,984,623)$(76,950)$13,609,213 
Stock-based compensation expense— — 45,464 — — 45,464 
Distributions to non-controlling interest— — — — (48,654)(48,654)
Net (loss) income— — — (1,538,796)28,320 (1,510,476)
Balance at June 30, 202424,850,261 $24,850 $57,691,400 $(45,523,419)$(97,284)$12,095,547 
Six Months ended June 30, 2024Common Stock Shares
Common Stock $0.001 Par Value
Additional
Paid-In
Capital
Accumulated
Deficit
Non-controlling
Interest
Total
Balance at December 31, 202324,850,261 $24,850 $57,601,402 $(42,879,656)$(94,301)$14,652,295 
Stock-based compensation expense— — 89,998 — — 89,998 
Distributions to non-controlling interest— — — — (48,654)(48,654)
Net loss— — — (2,643,763)45,671 (2,598,092)
Balance at June 30, 202424,850,261 $24,850 $57,691,400 $(45,523,419)$(97,284)$12,095,547 

The accompanying notes are an integral part of these condensed consolidated financial statements.
4

TECOGEN INC.




CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS
(unaudited)
Six Months Ended
 June 30, 2025June 30, 2024
CASH FLOWS FROM OPERATING ACTIVITIES:
Consolidated net loss$(2,133,644)(2,598,092)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation and amortization391,381 281,498 
Provision for (recovery of) credit losses(75,000)19,063 
Stock-based compensation83,439 89,998 
Unrealized loss on investment securities18,749 18,749 
Gain on disposition of assets(280)(4,028)
Non-cash interest expense33,538 12,800 
Changes in operating assets and liabilities
(Increase) decrease in:
Accounts receivable(538,938)1,398,193 
Inventory(45,224)439,926 
Unbilled revenue272,160  
Prepaid assets and other current assets(268,691)(125,784)
Other assets186,766 576,926 
Increase (decrease) in:
Accounts payable803,540 (108,646)
Accrued expenses and other current liabilities85,325 39,838 
Deferred revenue (2,193,607)806,266 
Other liabilities(395,134)(756,410)
Net cash provided by (used in) operating activities(3,775,620)90,297 
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of property and equipment(277,989)(556,636)
Proceeds from disposition of assets280 36,213 
Distributions to non-controlling interest(42,956)(48,654)
Net cash used in investing activities(320,665)(569,077)
CASH FLOWS FROM FINANCING ACTIVITIES:
     Finance lease principal payments(63,010)(30,577)
Proceeds from exercise of stock options394,926  
Net cash provided (used in) by financing activities331,916 (30,577)
Net increase (decrease) in cash and cash equivalents(3,764,369)(509,357)
Cash and cash equivalents, beginning of the period5,405,2331,351,270 
Cash and cash equivalents, end of the period$1,640,864 $841,913 
Supplemental disclosure of cash flow information:
Cash paid for interest$36,526 $22,909 
Cash paid for taxes$17,687 $22,100 
Non-cash investing activities
Right-of-use assets acquired under operating leases$193,480 $1,547,800 
Right-of-use assets acquired under finance leases$557,893 $27,282 
Aegis Contract and Related Asset Acquisition:
Contingent consideration$ $272,901 
Non-cash financing activities
Related party note conversion to common stock$514,148 $ 

The accompanying notes are an integral part of these condensed consolidated financial statements. 
5

TECOGEN INC.
Notes to Condensed Consolidated Financial Statements


Note 1. Description of Business and Basis of Presentation
Description of Business
Tecogen Inc., a Delaware corporation, was incorporated on September 15, 2000 (together with its subsidiaries "we", "our", "us", "Tecogen," or "Company"). We produce commercial and industrial, natural-gas-fueled engine-driven, combined heat and power (CHP) products that reduce energy costs, decrease greenhouse gas emissions and alleviate congestion on the national power grid. Our products supply electric power or mechanical power for cooling, while heat from the engine is recovered and purposefully used at a facility. The majority of our customers are located in regions with the highest utility rates, typically California, the Midwest and the Northeast.
Our operations are comprised of three business segments. Our Products segment designs, manufactures and sells industrial and commercial cogeneration systems. Our Services segment provides operation and maintenance services to customers for our products. Our Energy Production segment sells energy in the form of electricity, heat, hot water and cooling to our customers under long-term sales agreements.

Our common stock is listed on the NYSE American, LLC, stock exchange and trades under the symbol "TGEN." See "Note 14. Subsequent Events" of the Notes to Condensed Consolidated Financial Statements.
On July 21, 2025, we closed on the sale of an aggregate of 3,985,000 shares of common stock, $0.001 par value per share ("Common Stock"), including an additional 485,000 shares of common stock to cover over-allotments, at a price to the public of $5.00 per share (before deduction of underwriting discounts and commissions), in a firm commitment underwritten public offering pursuant to an underwriting agreement, dated July 18, 2025 ("Underwriting Agreement"), between the Company and Roth Capital Partners, LLC ("Roth") as sole underwriter and manager for the offering ("Offering").The net proceeds from the offering, after deducting underwriting discounts and commissions and estimated offering expenses were approximately $18,160,750.
Basis of Presentation
    The financial statements have been prepared in accordance with accounting standards set by the Financial Accounting Standards Board, or FASB. The FASB sets United States' ("U.S.") generally accepted accounting principles, or GAAP, to ensure financial condition, results of operations, and cash flows are consistently reported. References to GAAP issued by the FASB in these footnotes are to the FASB Accounting Standards Codification, or ASC. We adopted the presentation requirements for noncontrolling interests required by ASC 810 Consolidation. Under ASC 810, earnings or losses attributed to the noncontrolling interests are reported as part of the consolidated earnings and not a separate component of income or expense.
The accompanying condensed consolidated financial statements include our accounts and the accounts of the entities in which we have a controlling financial interest. Those entities include our wholly-owned subsidiary, American DG Energy Inc. ("ADGE"), Tecogen CHP Solutions, Inc., and a joint venture, American DG New York, LLC, or ADGNY, in which ADGE holds a 51.0% interest. As the controlling partner, all major decisions in respect of ADGNY are made by ADGE in accordance with the joint venture agreement. The interests in the individual underlying energy system projects in ADGNY vary between ADGE and its joint venture partner. The noncontrolling interest and distributions are determined based on economic ownership. The economic ownership is calculated by the amount invested by us and the noncontrolling partner in each site. Each quarter, we calculate a year-to-date profit or loss for each site that is part of ADGNY and the noncontrolling interest percent of economic ownership in each site is applied to determine the noncontrolling interest share in the profit or loss. The same methodology is used to determine quarterly distributions of available cash to the noncontrolling interest partner. On our balance sheet, noncontrolling interest represents the joint venture partner’s investment in ADGNY, plus its share of after-tax profits less any cash distributions. ADGE owned a controlling 51.0% legal and economic interest in ADGNY as of June 30, 2025 and December 31, 2024. Operating results for the six months ended June 30, 2025 are not necessarily indicative of the results that may be expected for the year ending December 31, 2025. All intercompany transactions have been eliminated in consolidation.
    The condensed consolidated balance sheet at December 31, 2024 has been derived from the audited consolidated financial statements at that date included in our Annual Report on Form 10-K for the year ended December 31, 2024, but does not include all of the information and footnotes required by U.S. GAAP for complete financial statements.
    For further information, refer to the consolidated financial statements and footnotes thereto included in Tecogen's Annual Report on Form 10-K for the year ended December 31, 2024.


6

TECOGEN INC.
Notes to Condensed Consolidated Financial Statements

Use of Estimates
The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates.
Inventory
Raw materials, work in process, and finished goods inventories are stated at the lower of cost, as determined by the average cost method, or net realizable value. We periodically review inventory quantities on hand for excess and/or obsolete inventory based primarily on historical usage, as well as based on estimated forecast of product demand. Any reserves that result from this review are charged to cost of sales.
Income Taxes
    The provisions for income taxes in the accompanying unaudited consolidated statements of operations differ from that which would be expected by applying the federal statutory tax rate primarily due to losses for which no benefit is recognized.
Business Combinations
In accordance with applicable accounting standards, we estimate the fair value of assets acquired and liabilities assumed as of the acquisition date of each business combination. Any excess purchase price over the fair value of the net tangible and intangible assets acquired is allocated to goodwill. We may make certain estimates and assumptions when determining the fair values of assets acquired and liabilities assumed, including intangible assets. Critical estimates in valuing certain intangible assets include but are not limited to future expected cash flows from energy production sites or customer maintenance contracts, estimated operating costs, as well as discount rates. At the acquisition date, we will also record acquisition related liabilities, if applicable, for any contingent consideration or deferred payments to the seller and pre-acquisition deferred maintenance contingencies identified at service contract acquisition. Contingent consideration and pre-acquisition deferred maintenance contingencies are recorded at fair value on the acquisition date based on our expectation of achieving the contractually defined revenue targets and actual and projected future costs. The fair value of the contingent consideration and pre-acquisition deferred maintenance liabilities are remeasured each reporting period after the acquisition date and any changes in the estimated fair value are reflected as gains or losses in cost of goods sold or general and administrative expense in the condensed consolidated statements of operations. Contingent consideration liabilities and deferred payments to sellers are recorded as current liabilities and other long-term liabilities in the consolidated balance sheets based on the expected timing of settlement.
Management’s estimates of fair value are based upon assumptions believed to be reasonable, but which are inherently uncertain and unpredictable and, as a result, actual results may differ from estimates. Any changes to provisional amounts identified during the measurement period are recognized in the reporting period in which the adjustment amounts are determined. Transaction costs associated with business combinations are expensed as incurred.
Segment Information
Our operations are comprised of three business segments. Our Products segment designs, manufactures and sells industrial and commercial cogeneration systems as described above. Our Services segment installs and maintains our cogeneration systems. Our Energy Production segment sells energy in the form of electricity, heat, hot water and cooling to our customers under long-term sales agreements. Segment profit is based on operating income after the elimination of intercompany transactions. Segment profit is a measure of operating performance of our reportable segments and may not be comparable to similar measures reported by other companies. Segment profit is a performance metric utilized by our Chief Executive Officer, who is our Chief Operating Decision Maker, to allocate resources to and assess performance of our segments. See "Note 13. Segments " of the Notes to Condensed Consolidated Financial Statements, for a reconciliation of segment profit to income from operations.

Recently Issued Accounting Standards
Income Taxes (Topic 740) - Improvements to Income Tax Disclosures. In December 2023, the Financial Accounting Standards Board issued ASU 2023-09, Income Taxes (Topic 740) - Improvements to Income Tax Disclosures. ASU 2023-09 provides more transparency about income tax information through improvements to income tax disclosures primarily related to the rate reconciliation and income taxes paid information. The amendments in this update are effective for annual periods beginning after December 15, 2024. Early adoption is permitted. The adoption of Topic 740 did not have a material effect on our consolidated financial statements, other than with respect to expanded disclosure.
Compensation - Stock Compensation (Topic 718) - In March 2024, the Financial Accounting Standards Board Issued ASU 2024-01, Compensation - Stock Compensation (Topic 718). ASU 2024-01 addresses generally accepted accounting
7

TECOGEN INC.
Notes to Condensed Consolidated Financial Statements

principles relating to profits interest awards and similar awards provided to employees or non-employees to align compensation with an entity's operating performance and provide the holders with the opportunity to participate in future profits and/or equity appreciation of the entity. We do not issue profits interest awards, and therefore, the adoption of ASU 2024-01 024-01 did not have a material effect on our financial position or results of operation.
Codification Improvements – Amendments to Remove References to the Concepts Statements. In March 2024, the Financial Accounting Standards Board Issued ASU 2024-02, Codification Improvements – Amendments to Remove References to the Concepts Statements. ASU 2024-02 contains amendments to the Codification that remove references to various FASB Concept Statements, affecting a variety of Topics in the Codification and applies to all reporting entities. The amendments in this update are effective for public entities for fiscal years beginning after December 15, 2024. Early application of the amendments in this update are permitted for any fiscal year or interim period for which financial statements have not yet been issued or made available for issuance. If adopted in an interim period, the amendment must be adopted as of the beginning of the fiscal year that includes the interim period. An entity should apply the amendments prospectively to all new transactions recognized on or after the date that the entity first applies the amendments, or retrospectively to the beginning of the earliest comparative period presented in which the amendments were first applied, by adjusting the opening balance of retained earnings, or other appropriate components of equity or net assets, as of the beginning of the earliest comparative period presented. The adoption of ASU 2024-02 did not have a material effect on our financial position or results of operation.
    Income Statement – Reporting Comprehensive Income – Expense Disaggregation Disclosures (Subtopic 220-40). In November 2024, the Financial Accounting Standards Board Issued ASU 2024-03 Income Statement - Reporting Comprehensive Income – Expense Disaggregation Disclosures (Subtopic 220-40). This update is intended to improve disclosures about public entity’s expenses and will require more detailed information about types of expenses including inventory purchases, employee compensation, depreciation, amortization and depletion in commonly presented captions such as cost of sales, SG&A and research and development. In addition, an entity will be required to include certain amounts that are already disclosed under U.S. GAAP in the same disclosure as the other disaggregation requirements; disclose a qualitative description of the amounts remaining in expense captions not separately disaggregated quantitatively; and, disclose the amount of selling expense and, in annual reporting periods, the entity’s definition of selling expenses. The amendments are effective for annual reporting periods beginning after December 15, 2026, and interim reporting periods beginning after December 15, 2027. Early adoption is permitted. The amendments should be applied prospectively to the financial statements after the effective date and retrospectively to any and all prior periods presented in the financial statements. ASU 2024-03 will apply to Tecogen after December 15, 2026, adoption of which will not have a material effect on our financial position or results of operation, but will require additional disclosure.

Note 2. Revenue
Revenue is recognized when performance obligations under the terms of a contract with a customer are satisfied; generally this occurs with the transfer of control of our products, services, and energy production. Revenue is measured as the amount of consideration we expect to receive in exchange for transferring goods or providing services or energy to customers.
Shipping and handling fees billed to customers in sales transactions are recorded in revenue and shipping and handling costs incurred are recorded in cost of sales. We have elected to exclude from revenue any value-added sales and other taxes which we collect concurrent with revenue-producing activities. These accounting policy elections are consistent with the manner in which historically we have recorded shipping and handling fees and value-added taxes. Incremental costs incurred by us to obtain a contract with a customer are negligible, if any, and are expensed ratably in proportion to the related revenue recognized.
Disaggregated Revenue    
In general, our business segmentation is aligned according to the nature and economic characteristics of our products and customer relationships and provides meaningful disaggregation of each business segment's results of operations. See "Note 13. Segments" of the Notes to Condensed Consolidated Financial Statements.
The following table further disaggregates our revenue by major source and by segment for the three and six months ended June 30, 2025 and 2024.

8

TECOGEN INC.
Notes to Condensed Consolidated Financial Statements

Three Months EndedSix Months Ended
RevenuesJune 30, 2025June 30, 2024June 30, 2025June 30, 2024
Products:
Cogeneration$1,066,835 $119,673 $2,147,204 $893,902 
Chiller2,015,893  3,390,090 657,061 
Engineered Accessories72,595  151,838 60,108 
Total Products Revenue3,155,323 119,673 5,689,132 1,611,071 
Services3,965,168 4,126,517 8,210,190 8,140,827 
Energy production174,329 481,597 673,268 1,161,985 
Total revenues$7,294,820 $4,727,787 $14,572,590 $10,913,883 
Products Segment
Products. Our Products revenues include cogeneration systems that supply electricity and hot water, chillers that provide air-conditioning and hot water and engineered accessories, which consist of ancillary products and parts necessary to install a cogeneration unit including integration into the customers’ existing electrical and mechanical systems. We refer to the package of engineered accessories and engineering and design services necessary for the customers' installation of a cogeneration unit as light installation services.
We transfer control and generally recognize a sale when we ship a product from our manufacturing facility at which point title has transferred and the customer takes ownership of the product. Payment terms on product sales are generally thirty (30) days.
We recognize revenue in certain circumstances before delivery to the customer has occurred (commonly referred to as bill and hold transactions). We recognize revenue related to such transactions once, among other things, the customer has made a written fixed commitment to purchase the product(s) under normal billing and credit terms, the customer has requested the product(s) be held for future delivery as scheduled and designated by them, risk of ownership has been assumed by the customer, and the product(s) are tagged as sold and segregated for storage awaiting further direction from the customer. Due to the infrequent nature and duration of bill and hold arrangements, the value associated with custodial storage services is deemed immaterial in the context of the contract and in total, and,accordingly, none of the transaction price is allocated to such service.
Depending on the product and terms of the arrangement, we may defer the recognition of a portion of the transaction price received because we have to satisfy a future obligation (e.g., product start-up service). Amounts allocated to product start-up services are recognized as revenue when the start-up service has been completed. We use an observable selling price to determine standalone selling prices where available and either a combination of an adjusted market assessment approach, an expected cost plus a margin approach, and/or a residual approach to determine the standalone selling prices for separate performance obligations as a basis for allocating contract consideration when an observable selling price is not available. Amounts received but not recognized pending completion of performance are recognized as contract liabilities and are recorded as deferred revenue along with deposits by customers.
Services Segment
Maintenance services are provided under either long-term maintenance contracts or time and material maintenance contracts. Revenue under time and material maintenance contracts is recognized when the maintenance service is completed. Revenue under long-term maintenance contracts is recognized either ratably over the term of the contract where the contract price is fixed or when the periodic maintenance activities are completed and the invoiced cost to the customer is based on run hours or kilowatts produced in a given period. We use an output method to measure progress towards completion of our performance obligation which results in the recognition of revenue on the basis of a direct measurement of the value to the customer of the services transferred to date relative to the remaining services promised under the contract. We use the practical expedient at ASC 606-10-55-18 of recognizing revenue in an amount equal to the amount we have the right to invoice the customer under the contract.
Our initial acquisition of the Aegis Energy Services, LLC ("Aegis"), maintenance contracts and related business closed on March 15, 2023. We have included the financial results of the Aegis maintenance agreements in our condensed consolidated financial statements from April 1, 2023, from February 1, 2024 and from May 1, 2024, the closing or acquisition dates for the acquisitions in our revenue from the Services segment. See "Note 7. Aegis Contract and Related Asset Acquisitions" of the Notes to Condensed Consolidated Statements for a further discussion of the Aegis acquisition. Payment terms for maintenance services are generally thirty (30) days.

9

TECOGEN INC.
Notes to Condensed Consolidated Financial Statements

Energy Production Segment    
Revenue from energy contracts is recognized when electricity, heat, hot and/or chilled water is produced by our owned on-site cogeneration systems. Each month we bill the customer and recognize revenue for the various forms of energy delivered, based on meter readings which capture the quantity of the various forms of energy delivered in a given month under a contractually defined formula which takes into account the current month's cost of energy from the local power utility.

As the various forms of energy delivered by us under energy production contracts are simultaneously delivered and consumed by the customer, our performance obligation under these contracts is considered to be satisfied over time. We use an output method to measure progress towards completion of our performance obligation which results in the recognition of revenue on the basis of a direct measurement of the value to the customer of the services transferred to date relative to the remaining services promised under the contract. We use the practical expedient at ASC 606-10-55-18 of recognizing revenue in an amount equal to that amount to which we have the right to invoice the customer under the contract. Payment terms on invoices under these contracts are generally thirty (30) days.
Contract Balances
    The timing of revenue recognition, billings and cash collections result in billed accounts receivable, unbilled revenue (contract assets) and deferred revenue, consisting of customer deposits and billings in excess of revenue recognized (contract liabilities) on the condensed consolidated balance sheets.
    We did not recognize any revenue during the six months ended June 30, 2025, that was included in unbilled revenue as of June 30, 2025.
    Revenue recognized during the six months ended June 30, 2025, that was included in deferred revenue at December 31, 2024 was approximately $4,948,347.
Remaining Performance Obligations
Remaining performance obligations related to ASC 606 represent the aggregate transaction price allocated to performance obligations with an original contract term of greater than one year, excluding certain maintenance contracts and all energy production contracts where a direct measurement of the value to the customer is used as a method of measuring progress towards completion of our performance obligation. Exclusion of these remaining performance obligations is due in part to the inability to quantify values based on unknown future levels of delivery and in some cases rates used to invoice customers. Remaining performance obligations therefore consist of unsatisfied or partially satisfied performance obligations related to fixed price maintenance contracts and installation contracts.
As of June 30, 2025, the aggregate amount of the transaction price allocated to remaining performance obligations was approximately $5,673,475. We expect to recognize revenue of approximately 81.5% of the remaining performance obligations over the next 24 months, 77.9% recognized in the first 12 months and 3.6% recognized over the subsequent 12 months and the balance thereafter.

Note 3. Income (Loss) Per Common Share
Basic and diluted loss per share for the three and six months ended June 30, 2025 and 2024, respectively, were as follows: 
Three Months EndedSix Months Ended
June 30, 2025June 30, 2024June 30, 2025June 30, 2024
Numerator:
Net loss available to stockholders$(1,464,105)$(1,538,796)$(2,124,027)$(2,643,763)
Denominator:
Weighted average shares outstanding - Basic25,250,217 24,850,261 25,103,388 24,850,261 
Effect of dilutive securities:
Stock options    
Weighted average shares outstanding - Diluted25,250,217 24,850,261 25,103,388 24,850,261 
Basic loss per share$(0.06)$(0.06)$(0.08)$(0.11)
Diluted loss per share$(0.06)$(0.06)$(0.08)$(0.11)
Anti-dilutive shares underlying stock options outstanding 1,911,532  1,911,532 

10

TECOGEN INC.
Notes to Condensed Consolidated Financial Statements

Note 4.Inventories, net
Inventories at June 30, 2025 and December 31, 2024 consisted of the following:

June 30, 2025December 31, 2024
Raw materials, net$8,784,481 $8,525,879 
Work-in-process629,430 930,769 
Finished goods, net265,318 177,357 
Total inventories, net$9,679,229 $9,634,005 


Note 5. Property, Plant and Equipment, net

Property, plant and equipment at June 30, 2025 and December 31, 2024 consisted of the following:
Estimated Useful
Life (in Years)
June 30, 2025December 31, 2024
Energy systems
10 - 15 years
$2,810,232 $2,810,232 
Machinery and equipment
5 - 7 years
1,613,697 1,598,538 
Furniture and fixtures
5 years
249,498 224,868 
Computer software
3 - 5 years
192,865 192,865 
Leasehold improvements*1,114,592 906,739 
5,980,884 5,733,242 
Less - accumulated depreciation and amortization(4,160,825)(3,995,206)
Property, plant and equipment, net$1,820,059 $1,738,036 
* Lesser of estimated useful life of asset or lease term
Depreciation and amortization expense on property and equipment for the three and six months ended June 30, 2025 and 2024 was $100,198 and $195,966 and $110,873 and $205,711, respectively.

Note 6. Intangible Assets and Liabilities Other Than Goodwill

As of June 30, 2025 and December 31, 2024 we had the following amounts related to intangible assets and liabilities other than goodwill:
June 30, 2025December 31, 2024
Intangible assetsCostAccumulated AmortizationTotalCostAccumulated AmortizationTotal
Product certifications$777,465 $(721,888)$55,577 $777,465 $(709,855)$67,610 
Patents888,910 (631,592)257,318 888,910 (584,493)304,417 
Developed technology240,000 (196,000)44,000 240,000 (188,000)52,000 
Trademarks26,896  26,896 26,896  26,896 
In Process R&D263,936 (160,247)103,689 263,936 (141,394)122,542 
Favorable contract asset384,465 (381,690)2,775 384,465 (379,839)4,626 
Customer contracts2,225,123 (384,419)1,840,704 2,225,123 (290,025)1,935,098 
$4,806,795 $(2,475,836)$2,330,959 $4,806,795 $(2,293,606)$2,513,189 
Intangible liability
Unfavorable contract liability$2,618,168 $(2,259,127)$359,041 $2,618,168 $(2,195,329)$422,839 
11

TECOGEN INC.
Notes to Condensed Consolidated Financial Statements

The aggregate amortization expense related to non-contract related intangible assets were $42,273 and $85,984 and $50,353 and $103,348 for the three and six months ended June 30, 2025 and 2024, respectively. The net aggregate expense (credit) related to the amortization of the contract related intangible assets and liabilities for the three and six months ended June 30, 2025 and 2024 were $18,398 and $32,448 and $2,024 and $(5,674), respectively.

Contract Related Intangibles
The favorable contract asset and unfavorable contract liability in the foregoing table represent the fair value of ADGE's customer contracts (both positive for favorable contracts and negative for unfavorable contracts) which were acquired by us on May 18, 2017. The customer contract asset includes the maintenance services contracts acquired by us on April 1, 2023 as part of the Aegis acquisition and pursuant to the February 2024 Amendment and the May 2024 Amendment. See" Note 7. Aegis Contract and Related Asset Acquisitions."
Amortization of intangibles including contract related amounts is calculated using the straight-line method over the remaining useful life or contract term, which range from approximately one year to eleven years, and is charged against either administrative expenses or cost of sales in the accompanying condensed consolidated statement of operations. Aggregate future amortization over the next five years is estimated to be as follows:
Non-contract Related IntangiblesContract Related IntangiblesTotal
Year 1$168,137 $107,141 $275,278 
Year 2167,954 127,411 295,365 
Year 395,470 136,329 231,799 
Year 414,395 137,208 151,603 
Year 55,650 137,743 143,393 
Thereafter8,978 838,606 847,584 
Total$460,584 1,484,438 $1,945,022 

Note 7.Aegis Contract and Related Asset Acquisitions
On March 15, 2023, we entered into an agreement ("Assumption Agreement") with Aegis Energy Services, LLC (“Aegis”), pursuant to which Aegis agreed to assign to us and we agreed to assume certain Aegis maintenance agreements, we agreed to purchase certain assets from Aegis, and related matters (“Acquisition”). On April 1, 2023, the Acquisition closed. Under the Assumption Agreement, we agreed to acquire from Aegis and assume Aegis’ rights and obligations arising on or after April 1, 2023, under maintenance agreements pursuant to which Aegis provided maintenance services to third parties for approximately 200 cogeneration systems and we agreed to acquire from Aegis certain vehicles and inventory used by Aegis in connection with the performance of its maintenance services. At closing, we acquired eight (8) Aegis vehicles for consideration consisting of $170,000 in cash. Also, we issued credits against outstanding accounts receivable due from Aegis in the amount of $300,000 for the acquisition of inventory that Aegis used to provide maintenance services. At closing, we hired eight (8) Aegis employees who, following the closing, have agreed to continue to provide maintenance services relating to the cogeneration systems covered by the maintenance agreements assumed pursuant to the Assumption Agreement. Following the closing and for a period of up to seven (7) years, we agreed to pay Aegis a percentage of the revenue collected for maintenance services provided pursuant to the maintenance agreements acquired from Aegis. Further, prior to December 31, 2023, we had the right to acquire and assume additional Aegis’ maintenance agreements for cogeneration systems on substantially similar terms and conditions. The Assumption Agreement contained certain indemnification provisions and agreements on the part of Aegis and for each party to cooperate with each other and provide certain transitional assistance. We acquired the Aegis maintenance agreements to expand our Service portfolio and to benefit from the long-term contract revenue stream generated by these agreements.
On February 1, 2024, Tecogen and Aegis amended the Assumption Agreement to add eighteen (18) additional maintenance contracts assumed by us ("February 2024 Amendment") which includes an undertaking by Aegis to use commercially reasonable efforts to support and assist our execution of maintenance service agreements for an additional thirty-six (36) cogeneration units sold to customers by Aegis.
On May 1, 2024, Tecogen and Aegis amended the Assumption Agreement to add thirty-one (31) additional maintenance contracts assumed by us ("May 2024 Amendment") which includes an undertaking by Aegis to use commercially reasonable efforts to support and assist our execution of maintenance service agreements for an additional forty-eight (48) cogeneration units sold to customers by Aegis.
12

TECOGEN INC.
Notes to Condensed Consolidated Financial Statements

No additional maintenance service agreements contemplated in the February 2024 Amendment or the May 2024 Amendment have been acquired as of June 30, 2025.
We have determined that the assignment and assumption of the Aegis maintenance agreements, in combination with the related asset acquisition and the retention of the former Aegis employees, constitutes a business and should be accounted for as a business combination under the acquisition method. As of the Acquisition date, we recognized, separately from goodwill, the identifiable assets acquired and the liabilities assumed, at fair value. We have applied an interpretation of the guidance in ASC 805, Business Combinations, that allows an entity to combine multiple acquisitions as one single transaction due to the April 1, 2023, February 1, 2024, and May 1, 2024, acquisitions being executed in contemplation of one another to achieve the same commercial objective for the Company. As a result, we have adjusted the initial accounting for the April 1, 2023 acquisition for the value of net assets acquired from the February 1, 2024 and May 1, 2024 acquisitions.
We have included the financial results of the Aegis maintenance agreements in our condensed consolidated financial statements from April 1, 2023, from February 1, 2024, and from May 1, 2024, the closing or acquisition dates for the acquisitions.
The following table summarizes the consideration paid for the Aegis acquisition and the fair value of assets acquired and contract-related liabilities assumed as of the acquisition date:
Acquisitions
April 1, 2023February 1, 2024May 1, 2024Total
Consideration Paid:
Cash$170,000 $ $ $170,000 
Accounts receivable credit issued300,000   300,000 
Account payable due to Aegis91,048   91,048 
Contingent consideration1,256,656 101,641 171,260 1,529,557 
Total fair value of consideration transferred1,817,704 101,641 171,260 2,090,605 
Identifiable assets acquired and liabilities assumed:
Assets acquired
Property, plant and equipment170,000   170,000 
Inventory391,048   391,048 
Identifiable intangible asset - customer contracts1,772,659 184,587 267,877 2,225,123 
2,333,707 184,587 267,877 2,786,171 
Acquired contract-related liabilities assumed
Deferred maintenance reserve(853,271)  (853,271)
Net identifiable assets acquired1,480,436 184,587 267,877 1,932,900 
Excess of cost over fair value of net assets acquired (Goodwill)$337,268 $(82,946)$(96,617)$157,705 
Initial Acquisition - April 1, 2023
The amounts initially recognized for inventory, identifiable intangible assets, contingent consideration and deferred maintenance reserves were provisional pending completion of the necessary valuations and analysis. ASC 805 establishes a measurement period to provide companies with a reasonable amount of time to obtain the information necessary to identify and measure various items in a business combination and cannot extend beyond one year from the acquisition date. As of December 31, 2023, we completed our analysis and valuation.
As of December 31, 2024, we recorded no remeasurement adjustments to the fair value of the contingent consideration and deferred maintenance reserves given the probability of achieving the revenue estimates and the actual and expected maintenance costs were consistent with our initial valuation.
February 2024 Amendment
The amounts initially recognized for identifiable intangible assets and contingent consideration were provisional, pending completion of the necessary valuations and analysis. ASC 805 establishes a measurement period to provide companies with a reasonable amount of time to obtain the information necessary to identify and measure various items in a business
13

TECOGEN INC.
Notes to Condensed Consolidated Financial Statements

combination and cannot extend beyond one year from the acquisition date. As of December 31, 2024, we completed our analysis and valuation for the February 2024 Amendment.
May 2024 Amendment
The amounts initially recognized for identifiable intangible assets and contingent consideration were provisional pending completion of the necessary valuations and analysis. ASC 805 establishes a measurement period to provide companies with a reasonable amount of time to obtain the information necessary to identify and measure various items in a business combination and cannot extend beyond one year from the acquisition date. As of December 31, 2024, we completed our analysis and valuation for the May 2024 Amendment.
Acquisition Valuation
The fair value of the identifiable intangible asset was estimated using the income approach. The excess cash flow was discounted to present value using an appropriate rate of return to estimate the market value of the customer identifiable intangible asset and the risks associated with the future revenue forecasts due to potential changes in customer energy requirements or changes in the economic viability of these CHP sites which depend on the spread between natural gas fuel and electricity prices, all of which are not within our control. Key assumptions to value the customer identifiable intangible asset included the discount rate of 15%, profitability assumptions, revenue assumptions, and anticipated existing contract run out were the material assumptions utilized in the discounted cash flow model used to estimate fair value. The discount rate reflects an estimate of our weighted-average cost of capital.
Following the closing and for a period of up to seven (7) years, we agreed to pay Aegis contingent consideration equal to a percentage of the revenue collected for maintenance services provided pursuant to the maintenance agreements acquired from Aegis. On the date of acquisition, the fair value of the contingent consideration and the deferred maintenance reserve were calculated under the income approach using a weighted average cost of capital of 15%, discounting the future cash flows to present value, and are subsequently remeasured to fair value at each reporting date until the fair value contingencies are resolved. Fair value adjustments which may be determined at subsequent reporting dates will be recorded in our condensed consolidated statements of operations and will not impact the goodwill balance after the measurement period.
The contingent consideration is payable within forty-five (45) days following the end of each calendar quarter through the earlier of the expiration or termination of the relevant maintenance agreements, or the seventh (7th) anniversary of the acquisition date. The consideration is equal to the product of the revenues collected in a calendar quarter multiplied by an applicable percentage. The agreement stipulates quarterly aggregate revenue targets and an applicable percentage, and provides for a higher applicable percentage if revenues exceed the target revenues. The applicable percentage ranges from 5% to 10% over the agreement term. The deferred maintenance reserve represents costs, which are expected to be incurred over a three-year period from the date of acquisition to repair customer equipment which had not been sufficiently maintained prior to our acquisition of the maintenance service agreements.
The purchase price of the acquisition was allocated to the tangible and intangible assets acquired and liabilities assumed and recognized at their fair value based on widely accepted valuation techniques in accordance with ASC 820, "Fair Value Measurement," as of the acquisition date. The process for estimating fair value requires the use of significant assumptions and estimates of future cash flows and developing appropriate discount rates. The excess of the purchase price over fair value of the net identified assets acquired and liabilities assumed was recorded as goodwill. Goodwill is primarily attributable to the going concern element of the Aegis business, including its assembled workforce and the long-term nature of the customer maintenance agreements, as well as anticipated cost synergies due primarily to the elimination of administrative overhead. Goodwill resulting from the Aegis acquisition is not expected to be deductible for income tax purposes.
Acquisition-related costs which consisted on recurring internal resources were de minimis and such costs were expensed as incurred (ASC 805-50-30-1).The following table summarizes the contract-related liabilities assumed as of June 30, 2025, and December 31, 2024:

14

TECOGEN INC.
Notes to Condensed Consolidated Financial Statements

June 30, 2025December 31, 2024
Acquisition liabilities, current portion
Contingent consideration$370,697 $328,350 
Deferred maintenance reserve512,844 574,202 
883,541 902,552 
Acquisition liabilities, net of current portion
Contingent consideration878,151 1,008,760 
$878,151 $1,008,760 

Revenues and gross profit from the Aegis maintenance contracts were $500,736 and $271,784 and $1,193,028 and $734,066, respectively, for the three and six months ended June 30, 2025. Revenue and gross profit for the three and six months ended June 30, 2024 were $652,785 and $471,835 and $1,411,547 and $956,879, respectively. The revenue and gross profit are and have been included in our Services segment since the respective contract acquisitions.
Periodic Remeasurement of Contingent Liabilities
The fair value of the contingent consideration and pre-acquisition deferred maintenance liabilities are remeasured each reporting period after the acquisition date and any changes in the estimated fair value are reflected as gains or losses in cost of goods sold or general and administrative expense in the condensed consolidated statement of operations.
We performed a remeasurement analysis of the contingent consideration and pre-acquisition deferred maintenance liabilities at June 30, 2025 and determined that the carrying value of the liabilities approximated the estimated fair value of the liabilities, based on a discounted cash flow analysis, and did not record a remeasurement adjustment for the year ended June 30, 2025.
We are unable to provide the pro forma information required under ASC 805-10-50-2(h) as the disclosure is impracticable since the required pre-acquisition historical contract records were not maintained by Aegis in a manner that would allow for an accurate reconstruction of financial performance prior to the acquisition. Despite reasonable efforts to obtain and validate the necessary data, including a review of the available information that was provided during the acquisition, we were unable to compile reliable financial information that would meet the disclosure requirements under ASC 805.
Note 8.Sale of Energy Producing Assets
    During the first quarter of 2019, we recognized two individual sales of energy producing assets for a total of eight power purchase agreements, including the associated energy production contracts, for total consideration of $7 million.
    In connection with these assets sales, we entered into agreements with the purchaser to maintain and operate the assets over the remaining periods of the associated energy production contracts (through August 2033 and January 2034, respectively) in exchange for monthly maintenance and operating fees. These agreements contain provisions whereby we have guaranteed to the purchaser a minimum level or threshold of cash flows from the associated energy production contracts. Actual results are compared to the minimum threshold bi-annually and we are contractually obligated to reimburse any shortfall to the purchaser. To the extent actual cash flow results exceed the minimum threshold, we are entitled to 50% of such excess under the agreements. Based upon an analysis of these energy producing assets' expected future performance, as of June 30, 2025, we do not expect to make any material payments under the guarantee.
At June 30, 2025, we owed $42,089 under the energy production contracts, representing 100% of the cash flows shortfall below the minimum threshold for the bi-annual period ended June 30, 2025. We expect to remit these funds in the third quarter of 2025.
    The foregoing agreements also contain provisions whereby we have agreed to make whole the purchaser in the event the counterparty to the energy production contract(s) defaults on or otherwise terminates before the stated expiration of the energy production contract. Should we be required to make whole the purchaser under such provisions, we would be entitled to seek recovery from the counterparty to the energy production contract(s) under a similar provision contained in those contracts in respect of early termination.
    We are also responsible under the agreements for site decommissioning costs, if any, in excess of certain threshold amounts by site. Decommissioning of site assets is performed when, if and as requested by the counterparty to the energy production contract upon termination of the energy production contract.    We review and assess the likelihood and potential liability for decommissioning when sites cease operating. To date, our decommissioning liability exposure has not been material since most customers assume the decommissioning costs in connection with their facility upgrade.
15

TECOGEN INC.
Notes to Condensed Consolidated Financial Statements

Note 9.Leases
    Our leases principally consist of operating leases related to our corporate office, field offices, and our research, manufacturing, and storage facilities. Effective December 19, 2023, we entered into a master finance lease agreement for motor vehicles.
At inception, we determine if an arrangement constitutes a lease and whether that lease meets the classification criteria of a finance or operating lease. Some of our lease agreements contain lease components (e.g. minimum rent payments) and non-lease components (e.g. maintenance, labor charges, etc.). We account for each component separately based on the estimated standalone price of each component.
Operating Leases
Operating leases are included in Right-of-use assets - operating leases, Operating lease obligations, current portion and Operating lease obligations, net of current portion, on the consolidated balance sheets. These assets and liabilities are recognized at the commencement date based on the present value of remaining lease payments over the lease term and using an incremental borrowing rate consistent with the lease terms or implicit rates, when readily determinable. For those leases where it is reasonably certain at the commencement date that we will exercise the option to extend the lease, then the lease term will include the lease extension term. Short-term operating leases, which have an initial term of 12 months or less, are not recorded on the balance sheet.
On March 31, 2023, we entered into two lease agreements for two adjacent buildings, located in North Billerica, Massachusetts, containing approximately 26,412 square feet of manufacturing, storage and office space to serve as our headquarters and manufacturing facilities. The lease agreements provide for initial lease terms of five (5) years with two successive options to renew for additional terms of five (5) years. Both leases commenced on January 1, 2024 and require payment of the base rent, real estate taxes, common maintenance expenses and aggregate deposits of $38,200. Our costs for initial improvements required to the leased premises is estimated to range between $1,125,000 and $1,175,000. As of June 30, 2025 we have expended $1,091,976 on the required improvements at our North Billerica facility.The estimated straight-line monthly rent expense for the initial term of the lease is approximately $26,962 per month. In accordance with ASC 842-20-30-1, we recorded the lease liability and right-of-use asset using the discount rate for the lease upon the lease commencement date, January 1, 2024.
On January 1, 2024 we extended the lease for our 2,800 square foot Valley Stream, NY service center for an additional three (3) years through December 31, 2026, with an option to renew for an additional term of three (3) years. The straight-line base monthly rent for the extension is $4,560 per month. On February 1, 2024, we entered into a lease agreement for 2,063 square feet of office and storage space in East Syracuse, New York for an initial lease term of three (3) years, expiring on January 31, 2027, with an option for an additional lease term of two (2) years. The straight-line base monthly rent for the initial lease term is $1,891 per month. On June 17, 2024, we extended our lease for our 1,751 square foot Hayward, CA service facility for an additional three (3) years through July 31, 2027. The straight-line monthly rent for the extension is $3,662 per month. On January 15, 2025, we entered into a lease agreement for 2,969 square feet of office and storage space in Easton, MA for an initial term of five (5) years, expiring on January 31, 2030, with an option for an additional lease term of five (5) years. The straight-line base monthly rent for the initial lease term is $2,324 per month. On April 30, 2025, we extended the term of our Windsor, CT service center for an additional two (2) years through March 31, 2027, effective April 1, 2025, for 2,000 square feet of office and storage space, with an option for an additional lease term of two (2) years. The straight-line base monthly rent for the initial lease term is $1,850 per month. On July 1, 2025, we exercised our option and extended the term of our 1,414 square foot Mamaroneck, NY service center for an additional term of five (5) years, expiring on February 28, 2031. The straight-line monthly rent for the additional term is $4,519 of our Mamaroneck, NY service facility
The lease on our former headquarters located in Waltham, Massachusetts which consisted of approximately 43,000 square feet of manufacturing, storage and office space, expired on April 30, 2024. The base monthly rent in 2024 was $44,254.
Lease expense for operating leases, which principally consists of fixed payments for base rent, is recognized on a straight-line basis over the lease term. Operating lease expense for the three and six months ended June 30, 2025 and 2024 was $148,969 and $297,260 and $195,651 and $467,213, respectively.

16

TECOGEN INC.
Notes to Condensed Consolidated Financial Statements

Supplemental information related to operating leases for the six months ended June 30, 2025 and 2024 was as follows:
June 30, 2025June 30, 2024
Cash paid for amounts included in the measurement of operating lease liabilities$274,399 $451,881 
Right-of-use assets obtained in exchange for operating lease liabilities$193,480 $1,547,800 
Weighted-average remaining lease term - operating leases3.7 Years4.5 Years
Weighted-average discount rate - operating leases7.6 %7.5 %
Supplemental balance sheet information related to operating leases as of June 30, 2025 and December 31, 2024 was as follows:
June 30, 2025December 31, 2024
Operating leases
Right-of-use assets$1,728,780 $1,730,358 
Operating lease liability, current portion$481,891 $430,382 
Operating lease liability, net of current portion1,295,450 1,341,789 
Total operating lease liability$1,777,341 $1,772,171 
Finance Leases
Finance leases are included in Right-of-use assets - finance leases, Finance lease obligations, current portion and Finance lease obligations, net of current portion, on the condensed consolidated balance sheets. These assets and liabilities are recognized at the commencement date based on the present value of remaining lease payments over the lease term and using an incremental borrowing rate consistent with the lease terms or implicit rates, when readily determinable. For those leases where it is reasonably certain at the commencement date that we will exercise the option to extend the lease, then the lease term will include the lease extension term. On December 19, 2023, we entered into a master finance lease agreement for motor vehicles.
Lease expense for finance leases for the six months ended June 30, 2025 and 2024 was as follows:
June 30, 2025June 30, 2024
Finance lease cost:
Depreciation of right-of-use assets$76,469 $21,888 
Interest on lease liabilities30,253 9,584 
Total finance lease cost$106,722 $31,472 

Supplemental information related to finance leases for the six months ended June 30, 2025 and 2024 was as follows:
June 30, 2025June 30, 2024
Cash paid for amounts included in the measurement of finance lease liabilities$144,463 $44,049 
Right-of-use assets obtained in exchange for finance lease liabilities557,893 27,282 
Weighted-average remaining lease term - finance leases4.4 Years4.5 Years
Weighted-average discount rate - finance leases10.2 %10.4 %

17

TECOGEN INC.
Notes to Condensed Consolidated Financial Statements

Supplemental balance sheet information related to finance leases as of June 30, 2025 and December 31, 2024 is as follows:
June 30, 2025December 31, 2024
Finance leases
Right-of-use assets - motor vehicles$909,572 $425,563 
Right-of-use assets - boiler24,099 26,827 
Total finance lease assets$933,671 $452,390 
Finance lease liability, current portion$173,362 $85,646 
Finance lease liability, net of current portion675,198 325,235 
Total finance lease liability$848,560 $410,881 

Future minimum lease commitments under non-cancellable operating and finance leases as of June 30, 2025 were as follows:
Operating LeasesFinance LeasesTotal
Year 1$593,020 $255,513 $848,533 
Year 2554,233 239,623 793,856 
Year 3477,516 239,623 717,139 
Year 4286,620 215,170 501,790 
Year 572,947 100,825 173,772 
Thereafter37,960  37,960 
Total lease payments2,022,296 1,050,754 3,073,050 
Less: imputed interest244,955 202,194 447,149 
Total$1,777,341 $848,560 $2,625,901 

Note 10.Stock-Based Compensation
Stock-Based Compensation
On December 22, 2005, our Board of Directors adopted Tecogen's 2006 Stock Option and Incentive Plan ("2006 Plan") under which the Board of Directors or a committee appointed by the Board of Directors may grant incentive stock options to officers and employees and may grant non-qualified stock options, restricted stock and stock to officers, employees, directors, advisors and consultants. The 2006 Plan was amended at various dates by the Board of Directors to increase the number of shares of common stock reserved for issuance under the Plan to 3,838,750, and, in June 2017, stockholders approved an amendment to extend the termination date of the Plan to January 1, 2026 (2006 Plan as amended, "Amended Plan").
Stock options vest based upon the terms of each individual option grant with an acceleration of the unvested portion of such options upon a change of control event, as defined in the Amended Plan. The options are not transferable except by will or domestic relations order. Under the Internal Revenue Code, the option exercise price per share under the Amended Plan cannot be less than the fair market value of the underlying shares on the date of the grant. Incentive stock options granted to an officer or employee owning more than 10% of the combined voting power of the Company, are required to be exercisable at a price per share equal to 110% of the fair market value of a share on the date of grant. The number of shares remaining available for future issuance under the Amended Plan as of June 30, 2025 was 1,079,568.
During the six months ended June 30, 2025, we granted non-qualified options to purchase an aggregate of 30,000 shares of common stock to certain employees at prices between $2.14 per share and $2.88 per share to purchase shares of common stock under the Amended Plan. The fair value of the options issued in 2025 was $33,470. The weighted-average grant date fair-value of stock options granted in 2025 was $1.12 per share.
On March 8, 2022, our Board of Directors adopted Tecogen's 2022 Stock Incentive Plan ("2022 Plan"), under which the Board of Directors or a committee appointed by the Board of Directors may grant incentive stock options to officers and employees and grant non-qualified stock options, restricted stock, and stock grants to officers, employees, directors, advisors
18

TECOGEN INC.
Notes to Condensed Consolidated Financial Statements

and consultants. We have reserved 3,800,000 shares of our common stock for issuance pursuant to awards under the 2022 Plan. The adoption of the 2022 Plan was approved by our shareholders on June 9, 2022. The 2022 Plan expires ten years from its effective date or March 1, 2032.
Under the 2022 Plan, stock options vest based upon the terms of each individual option grant with an acceleration of the unvested portion of such options upon a change of control event, as defined in the 2022 Plan. The options are not transferable except by will or domestic relations order. Under the Internal Revenue Code, the option exercise price per share under the Amended Plan cannot be less than the fair market value of the underlying shares on the date of the grant. Incentive stock options granted to an officer or employee owning more than 10% of the combined voting power of the Company are required to be exercisable at a price per share equal to 110% of the fair market value of a share on the date of grant. The number of shares remaining available for future issuance under the Plan as of June 30, 2025 was 2,950,000.
During the six months ended June 30, 2025, we did not grant any options to purchase shares of common stock under the 2022 Plan.
Stock option activity for the six months ended June 30, 2025 was as follows: 
Common Stock OptionsNumber of
Options
Exercise
Price
Per
Share
Weighted Average Exercise PriceWeighted
Average
Remaining
Life
Aggregate
Intrinsic
Value
Outstanding, December 31, 20242,752,962 $0.71$3.93$1.14 6.70 years$1,348,684 
Granted
30,000 $2.14$2.88$2.32 
Exercised
(380,973)$0.71$3.44$1.04 $2,195,741 
Canceled and forfeited
(1,400)$1.10 
Outstanding, June 30, 20252,400,589 $0.71$3.93$1.17 6.30 years$13,507,704 
Exercisable, June 30, 20251,548,089 $1.30 $8,518,466 
Vested and expected to vest, June 30, 20252,272,714 $1.19  $12,759,318 
We used a forfeiture rate of 15% to calculate the expected to vest shares in the table above. We use the Black-Scholes option pricing model to determine the fair value of stock options granted. Use of a valuation model requires management to make certain assumptions with respect to selected model inputs. Expected volatility was calculated based on the average volatility of four comparable publicly traded companies. The average expected life was estimated using the simplified method to determine the expected life based on the vesting period and contractual terms, since we do not have the necessary historical exercise data to determine an expected life for stock options. We use a single weighted-average expected life to value option awards and recognize compensation on a straight-line basis over the requisite service period for each separately vesting portion of the awards. The risk-free interest rate is based on U.S. Treasury zero-coupon issues with a remaining term which approximates the expected life assumed at the date of grant.
The weighted average assumptions used in the Black-Scholes option pricing model for options granted in six months ended June 30, 2025 and 2024 are as follows:
Stock Option Award AssumptionsJune 30, 2025June 30, 2024
Expected dividend yield%%
Expected life6.25 years6.25 years
Risk-free interest rate4.22%4.28%
Expected volatility42.33%40.17%
Consolidated stock-based compensation expense for the three and six months ended June 30, 2025 and 2024 was $42,606 and $83,439 and $45,464 and $89,998, respectively. No tax benefit was recognized related to the stock-based compensation recorded during the period.
At June 30, 2025, the total compensation cost related to unvested stock option awards not yet recognized is $228,481 and this amount will be recognized over a weighted average period of 2.33 years.

Note 11.Related Party Notes
On October 9, 2023, we entered into note subscription agreements with each of John N. Hatsopoulos and Earl R. Lewis, III, each a director and shareholder of the Company, pursuant to which Mr. Hatsopoulos agreed to provide financing to us of up to $1,000,000, and Mr. Lewis agreed to provide financing to us of $500,000, and potentially, an additional $500,000 at his discretion. On October 10, 2023, we borrowed $500,000 from Mr. Hatsopoulos and issued him a one-year promissory note with interest accruing at 5.12% per annum. On July 23, 2024, we borrowed an additional $500,000 from Mr. Hatsopoulos, and
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Notes to Condensed Consolidated Financial Statements

issued a one-year promissory note with interest accruing at 5.06% per annum. On March 21, 2024, Mr. Hatsopoulos amended the terms of the promissory note, dated October 10, 2023, extending the maturity date by one-year, making the maturity date October 10, 2025. On September 18, 2024, we borrowed $500,000 from Mr. Lewis and issued him a one-year promissory note with interest accruing at 4.57% per annum.
On January 14, 2025, we agreed to permit Mr. Lewis to either receive repayment of his note in cash or, at his discretion, convert the balance of the promissory note into shares of our common stock. In the event of such a conversion, the number of shares required to be issued will be determined by dividing the balance due under the promissory note by the average closing price per share of our shares during the thirty-day period prior to the date of conversion.
On February 18, 2025, we amended the promissory notes with Mr. Hatsopoulos to extend the maturity dates for both promissory notes to July 31, 2026. We also agreed to permit Mr. Hatsopoulos to either receive repayment of his notes in cash, or at his discretion, convert the balance(s) due of one or both of the promissory notes into shares of our common stock. In the event of such a conversion, the number of shares we will be required to issue will be determined by dividing the balance(s) due under the promissory note(s) by the average closing price per share of our shares during the thirty-day period prior to the date of conversion.
The loans are required to be repaid in the event of a change of control of the company and upon the occurrence of an event of default under the note, including upon a failure to pay when due the principal and interest when due, or the commencement of voluntary or involuntary bankruptcy or insolvency proceeding.
The loans and terms of the loan agreements were unanimously approved by our Board of Directors.
The loans bear interest on the outstanding principal at the Internal Revenue Service’s Applicable Federal Rate to be determined at the time we issue a promissory note in connection with a loan draw-down. The notes may be prepaid by us at any time. The principal amount of each loan and accrued interest is subject to mandatory prepayment in the event of a change of control of the registrant. The promissory notes are subject to customary events of default and are transferable provided the conditions to transfer set forth in the promissory notes are satisfied by the noteholder. The proceeds of the loans have been used for general working capital purposes and to fund the initial improvements required at our North Billerica facility.
At June 30, 2025, our obligation to Mr. Hatsopoulos under the promissory notes, inclusive of $67,848 of accrued and unpaid interest, was $1,067,848, and was reclassed to long-term liabilities due to the February 18, 2025 amendment.
On May 1, 2025, Mr. Lewis elected to convert the promissory note we issued to him in connection with his loan to us in the principal amount of $500,000 together with $14,148 of accrued and unpaid interest into 240,256 shares of our common stock at a per share price of $2.14. The number of shares was determined by dividing the balance due under the promissory note by the average closing price per share of our shares during the thirty-day period prior to the date of conversion. At June 30, 2025 our obligation to Mr. Lewis under the promissory note was retired.
Note 12.Fair Value Measurements
    The fair value topic of the FASB Accounting Standards Codification defines fair value as the exchange price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. The accounting guidance also establishes a fair value hierarchy which requires an entity to maximize the use of observable inputs, where available, and minimize the use of unobservable inputs when measuring fair value. There are three levels of inputs that may be used to measure fair value:
 Level 1 - Unadjusted quoted prices in active markets for identical assets or liabilities. We currently do not have any Level 1 financial assets or liabilities.
 Level 2 - Observable inputs other than quoted prices included in Level 1. Level 2 inputs include quoted prices for identical assets or liabilities in non-active markets, quoted prices for similar assets or liabilities in active markets and inputs other than quoted prices that are observable for substantially the full term of the asset or liability. We have Level 2 financial assets as provided below.
 Level 3 - Unobservable inputs reflecting management’s own assumptions about the input used in pricing the asset or liability. We have Level 3 liabilities as provided below.
Marketable equity securities
    The following tables present the asset reported in "other assets" in the condensed consolidated balance sheet measured at its fair value on a recurring basis as of June 30, 2025 and 2024 by level within the fair value hierarchy.
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Notes to Condensed Consolidated Financial Statements

Quoted prices in active markets for identical assetsSignificant other observable inputsSignificant unobservable inputs
TotalLevel 1Level 2Level 3Gains (losses)
June 30, 2025
Recurring fair value measurements
    Marketable equity securities
          EuroSite Power Inc.$74,995 $ $74,995 $ $(18,749)
Total recurring fair value measurements$74,995 $ $74,995 $ $(18,749)
June 30, 2024
Recurring fair value measurements
Marketable equity securities
EuroSite Power Inc.$131,241 $ $131,241 $ $37,497 
Total recurring fair value measurements$131,241 $ $131,241 $ $37,497 
      
    We utilize a Level 2 category fair value measurement to value our investment in EuroSite Power, Inc. as a marketable equity security at period end. That measurement is equal to the quoted market closing price at period end. Since this security is not actively traded we classify it as Level 2.
The following table summarizes changes in Level 2 assets which are comprised of marketable equity securities for the three months ended June 30, 2025 and 2024:
Fair value at December 31, 2024$93,744 
Unrealized loss(18,749)
Fair value at June 30, 2025$74,995 
Fair value at December 31, 2023$93,744 
Unrealized gain37,497 
Fair value at June 30, 2024$131,241 

Contingent Contract Consideration
We utilize a Level 3 category fair value measurement to value the agreed upon Aegis contingent contract consideration liability at period end since there are no quoted prices for this liability in non-active markets, there are no quoted prices for similar liabilities in active markets and there are no inputs that are observable for substantially the full term of the the liability. The contingent contract consideration calculation requires management to make estimates and assumptions that affect the reported amount of the liability. The contingent contract consideration is payable each calendar quarter through the earlier of the expiration or termination of the relevant maintenance agreements, or the seventh (7th) anniversary of the acquisition date. The consideration is equal to the product of the revenues collected in a calendar quarter multiplied by an applicable percentage. The agreement stipulates quarterly aggregate revenue targets and an applicable percentage, and provides for a higher applicable percentage if revenues exceed the target revenues. The applicable percentage ranges from 5% to 10% over the agreement term. On the date of acquisition, the fair value of the contingent consideration was calculated using a weighted average cost of capital of 15%, discounting the future cash flows to present value.
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Notes to Condensed Consolidated Financial Statements

Quoted prices in active markets for identical assetsSignificant other observable inputsSignificant unobservable inputs
TotalLevel 1Level 2Level 3Total gains (losses)
June 30, 2025
Recurring fair value measurements
Contingent contract consideration
Acquisition liabilities, current portion$370,697 $ $ $370,697 $ 
Acquisition liabilities, net of current portion878,151   878,151  
Total recurring fair value measurements$1,248,848 $ $ $1,248,848 $ 
June 30, 2024
Recurring fair value measurements
Contingent contract consideration
Acquisition liabilities, current portion$269,368 $ $ $269,368 $ 
Acquisition liabilities, net of current portion1,129,172   1,129,172  
Total recurring fair value measurements$1,398,540 $ $ $1,398,540 $ 
Note 13.Segments
    Our Chief Executive Officer, who is our Chief Operating Decision Maker ("CODM"), manages our business through three operating segments, wherein our CODM manages our businesses by: (i) assessing operating performance on a periodic basis, (ii) making resource allocation decisions and (iii) designating responsibilities for his direct reports. As of June 30, 2025, we were organized into three operating segments through which senior management evaluates our business. These segments, as described in more detail in "Note 1. Description of Business and Basis of Presentation", are organized around the products, services and energy production provided to customers and represent our reportable segments.
Our CODM uses segment profit, based on operating income after the elimination of intercompany transactions and segment identifiable assets to assess segment operating performance and to make resource allocation decisions. Certain costs such as other income (expense) are not included in the measure of segment profit and are excluded from management's assessment of segment financial performance.
Corporate includes finance, treasury, certain research and development costs, tax and legal costs and certain other costs which are not allocated to the reportable segments.
The following table presents information by reportable segment for the three and six months ended June 30, 2025 and 2024:
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Notes to Condensed Consolidated Financial Statements

ProductsServicesEnergy ProductionCorporateTotal
Three Months Ended June 30, 2025
Revenues$3,155,323 $3,965,168 $174,329 $ $7,294,820 
Cost of sales2,232,154 2,469,737 130,437 4,832,328 
Gross profit923,169 1,495,431 43,892  2,462,492 
Operating expenses607,312 1,857,872 (797)1,409,967 3,874,354 
Profit (loss) from operations$315,857 $(362,441)$44,689 $(1,409,967)$(1,411,862)
Identifiable assets$11,211,540 $11,676,917 $2,602,821 $2,860,559 $28,351,837 
Six Months Ended June 30, 2025
Revenues$5,689,132 $8,210,190 $673,268 $ $14,572,590 
Cost of sales3,719,905 4,728,635 440,518 8,889,058 
Gross profit1,969,227 3,481,555 232,750  5,683,532 
Operating expenses1,177,141 3,618,318 15,672 2,878,507 7,689,638 
Profit (loss) from operations$792,086 $(136,763)$217,078 $(2,878,507)$(2,006,106)
Identifiable assets$11,211,540 $11,676,917 $2,602,821 $2,860,559 $28,351,837 
Three Months Ended June 30, 2024
Revenues$119,673 $4,126,517 $481,597 $ $4,727,787 
Cost of sales171,982 2,191,815 284,835  2,648,632 
Gross profit(52,309)1,934,702 196,762  2,079,155 
Operating expenses459,764 1,632,550 22,148 1,438,660 3,553,122 
Profit (loss) from operations$(512,073)$302,152 $174,614 $(1,438,660)$(1,473,967)
Identifiable assets$8,801,555 $12,798,442 $3,150,322 $2,404,641 $27,154,960 
Six Months Ended June 30, 2024
Revenues$1,611,071 $8,140,827 $1,161,985 $ $10,913,883 
Cost of sales1,221,525 4,284,072 753,475  6,259,072 
Gross profit389,546 3,856,755 408,510  4,654,811 
Operating expenses1,089,013 3,119,890 41,250 2,928,509 7,178,662 
Profit (loss) from operations$(699,467)$736,865 $367,260 $(2,928,509)$(2,523,851)
Identifiable assets$8,801,555 $12,798,442 $3,150,322 $2,404,641 $27,154,960 
Note 14.Subsequent Events
    We have evaluated events through the date of this filing, and, except as described below, have determined that no material subsequent events occurred that would require recognition in the consolidated financial statements or disclosure in the notes thereto.
On July 21, 2025, we closed on the sale of an aggregate of 3,985,000 shares of common stock, $0.001 par value per share ("Common Stock"), including an additional 485,000 shares of common stock to cover over-allotments, at a price to the public of $5.00 per share (before deduction of underwriting discounts and commissions), in a firm commitment underwritten public offering pursuant to an underwriting agreement, dated July 18, 2025 ("Underwriting Agreement"), between the Company and Roth Capital Partners, LLC ("Roth") as sole underwriter and manager for the offering ("Offering").
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Notes to Condensed Consolidated Financial Statements

We estimate that the net proceeds of the offering, after deducting underwriting discounts and commissions and estimated offering expenses will be approximately $18,160,750. We intend to use the net proceeds of the offering for continued product development, increased sales and marketing activities, sales, marketing, additional human resources, capital expenditures, and other costs and expenses it may incur in connection with its anticipated expansion into the data center market, and for general working capital and corporate purposes.
Pursuant to the terms of an engagement letter we entered into with Roth, dated January 15, 2025, for a period of 12 months, we have agreed that Roth will serve as the exclusive underwriter for us with respect to any offering of our equity or equity-linked securities.
Subject to certain limited exceptions, we have agreed for a period of 90 days after the closing of the Offering not to (i) offer, issue, sell, contract to sell, encumber, grant any option for the sale of or otherwise dispose of any of our securities without Roth’s prior written consent; and (ii) each of our directors, officers, and affiliates who are holders of our shares as of the date the underwriting agreement was executed (and all holders of securities exercisable for or convertible into shares of our Common Stock) has agreed, for a period of 90 days after July 18, 2025, subject to certain exceptions, not to offer, issue, sell, contract to sell, encumber, grant any option for the sale of or otherwise dispose of any of our securities, including shares of Common Stock issuable upon exercise of currently outstanding options granted to any such person; provided that, among other things, the following are not subject to such restrictions: transfers by way of bona fide gift; transfers to trusts for the benefit of the donor and his immediate family provided the beneficiary or trustee agree to be bound by the lock-up agreement; and the acquisition or exercise of any stock option pursuant to the Company’s existing stock option plans.
The underwriter may in its sole discretion and at any time without notice release some or all of the shares subject to lock-up agreements prior to the expiration of the lock-up period. When determining whether or not to release shares from the lock-up agreements, the underwriter will consider, among other factors, the security holder’s reasons for requesting release, the number of shares for which the release is being requested and market conditions at the time.
Pursuant to the Underwriting Agreement, we have agreed to indemnify the underwriters against liabilities relating to the Offering arising under the Securities Act of 1933, as amended (“Securities Act”) or otherwise, as well as liabilities arising from any material inaccuracy in the representations and warranties of the Company in the Underwriting Agreement, and to contribute to payments that Roth may be required to make for these liabilities.
The foregoing description of the Underwriting Agreement is not complete and is qualified in its entirety by reference to the full text of the Underwriting Agreement, a copy of which was filed as an exhibit to the Company’s Current Report on Form 8-K filed with the Securities and Exchange Commission on July 18, 2025.
The foregoing does not constitute an offer to sell or the solicitation of an offer to buy these securities, nor shall there be any sale of these securities in any state or other jurisdiction in which such offer, solicitation or sale would be unlawful prior to the registration or qualification under the securities laws of any such state or other jurisdiction.


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Notes to Condensed Consolidated Financial Statements



Item 2. Management's Discussion and Analysis of Financial Condition and Results of Operations
This Management’s Discussion and Analysis of Financial Condition and Results of Operations and other parts of this Quarterly Report on Form 10-Q (“Form 10-Q”) contain forward-looking statements, within the meaning of the Private Securities Litigation Reform Act of 1995, that involve risks and uncertainties. Any statements contained herein that are not statements of historical fact may be deemed to be forward-looking statements. Forward-looking statements provide current expectations of future events based on certain assumptions and include any statement that does not directly relate to any historical or current fact. Forward-looking statements can also be identified by words such as “future,” “anticipates,” “believes,” “estimates,” “expects,” “intends,” “plans,” “predicts,” “will,” “would,” “could,” “can,” “may,” and similar terms. Forward-looking statements are not guarantees of future performance and our actual results may differ significantly from the results discussed in the forward-looking statements. Such forward-looking statements include, among other things, demand for our products and services, the availability of incentives, rebates, and tax benefits relating to our products, changes in the regulatory environment relating to our products, competing technological developments, and the availability of financing to fund our operations and growth. Factors that might cause such differences include, but are not limited to, those discussed in Part I, Item 1A of our Annual Report on Form 10-K for the year ended December 31, 2024 (“2024 Form 10-K”), as supplemented, and Part II, Item 1A of this Form 10-Q, in each case under the heading “Risk Factors.” The following discussion should be read in conjunction with the 2024 Form 10-K filed with the Securities and Exchange Commission (“SEC”) and the condensed consolidated financial statements and accompanying notes included in Part I, Item 1 of this Form 10-Q. Each of the terms "we,” “our,” “us,” "Tecogen," or "Company" as used herein refer collectively to Tecogen Inc. and our wholly owned subsidiaries, unless otherwise stated. While we may elect to update forward-looking statements in the future, we specifically disclaim any obligation to do so, even if our estimates change, and you should not rely on those forward-looking statements as representing our views as of any date subsequent to the date of the filing of this Form 10-Q.
Recent Developments
Recent Equity Financing
On July 21, 2025, we closed on a firm commitment underwitten public offering of 3,985,000 shares of common stock, $0.001 par value per share ("Common Stock"), including an additional 485,000 shares of common stock to cover over-allotments, at a price to the public of $5.00 per share, pursuant to an underwriting agreement, dated July 18, 2025, between us and Roth Capital Partners, LLC, as sole underwriter and manager for the offering. The net proceeds of the offering, after deducting underwriting discounts and commissions and estimated offering expenses were approximately $18,160,750.
We intend to use the net proceeds of the offering for continued product development, increased sales and marketing activities, sales, marketing, additional human resources, capital expenditures, and other costs and expenses we may incur in connection with the anticipated expansion into the data center market, and for general working capital and corporate purposes. See "Note 14. Subsequent Events" to the Notes to the Condensed Consolidated Financial Statements.
Uplist to NYSE American Stock Exchange
On April 30, 2025, we announced that shares our shares of common stock had been approved for listing on the NYSE American LLC ("NYSE American"), stock exchange. On May 6, 2025, our common stock began trading on the NYSE American under our current symbol "TGEN."
Vertiv Sales and Marketing Agreement - Data Center Cooling Market
On February 28, 2025, we entered into a Sales and Marketing Agreement with Vertiv Corporation (“Vertiv”) relating to sales of Tecogen DTx chillers for data center cooling applications (the “Vertiv Agreement”). The Vertiv Agreement has a term of two years and provides that Vertiv will establish a budget for marketing activities and use commercially reasonable efforts to sell our DTx chillers for cooling applications in data centers. The Vertiv Agreement also provides the basis for the negotiation of a definitive supply agreement between us and Vertiv. We have agreed to provide Vertiv with reasonable discounts for purchases of significant volumes of our chillers, and Vertiv has agreed to use commercially reasonable efforts to assist us in securing favorable terms for engineering components and supplies for manufacturing our chillers. Pursuant to the Vertiv Agreement we have granted Vertiv the exclusive right to market and sell our DTx chillers for data center cooling applications outside the United States, and the non-exclusive right to market and sell our DTx chillers within the United States. We have also agreed to grant Vertiv the exclusive right to market and sell our DTx chillers for data center cooling applications in the United States if Vertiv achieves and maintains agreed sales levels of DTx chillers. The foregoing description of the Vertiv Agreement is not complete and is qualified in its entirety by reference to the full text thereof, a copy of which was filed as Exhibit 99.01 to our Current Report on Form 8-K filed with the Securities and Exchange Commission on February 28, 2025.

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Assumption of Aegis Energy Services Maintenance Agreements
On March 15, 2023, we entered into an agreement ("Assumption Agreement") with Aegis Energy Services, LLC (“Aegis”), pursuant to which Aegis agreed to assign to us and we agreed to assume certain Aegis maintenance agreements, we agreed to purchase certain assets from Aegis, and related matters (“Acquisition”). On April 1, 2023, the Acquisition closed. Under the Assumption Agreement, we agreed to acquire from Aegis and assume Aegis’ rights and obligations arising on or after April 1, 2023, under maintenance agreements pursuant to which Aegis provided maintenance services to third parties for approximately 200 cogeneration systems and we agreed to acquire from Aegis certain vehicles and inventory used by Aegis in connection with the performance of its maintenance services. At closing, we acquired eight (8) Aegis vehicles for consideration consisting of $170,000 in cash. Also, we issued credits against outstanding accounts receivable due from Aegis in the amount of $300,000 for the acquisition of inventory that Aegis used to provide maintenance services. At closing, we hired eight (8) Aegis employees who, following the closing, have agreed to continue to provide maintenance services relating to the cogeneration systems covered by the maintenance agreements assumed pursuant to the Assumption Agreement. Following the closing and for a period of up to seven (7) years, we agreed to pay Aegis a percentage of the revenue collected for maintenance services provided pursuant to the maintenance agreements acquired from Aegis. Further, prior to December 31, 2023, we had the right to acquire and assume additional Aegis’ maintenance agreements for cogeneration systems on substantially similar terms and conditions. The Assumption Agreement contained certain indemnification provisions and agreements on the part of Aegis and for each party to cooperate with each other and provide certain transitional assistance. We acquired the Aegis maintenance agreements to expand our Service portfolio and to benefit from the long-term contract revenue stream generated by these agreements.
On February 1, 2024, Tecogen and Aegis amended the Assumption Agreement to add eighteen (18) additional maintenance contracts assumed by us ("February 2024 Amendment") which includes an undertaking by Aegis to use commercially reasonable efforts to support and assist our execution of maintenance service agreements for an additional thirty-six (36) cogeneration units sold to customers by Aegis.
On May 1, 2024, Tecogen and Aegis amended the Assumption Agreement to add thirty-one (31) additional maintenance contracts assumed by us ("May 2024 Amendment") which includes an undertaking by Aegis to use commercially reasonable efforts to support and assist our execution of maintenance service agreements for an additional forty-eight (48) cogeneration units sold to customers by Aegis.
See "Note 7. Aegis Contract and Related Asset Acquisitions" of the Notes to the Condensed Consolidated Financial Statements.    
Facilities Relocation
In April, 2024, we moved our manufacturing operations and corporate offices from 45 First Avenue, Waltham, Massachusetts to 76 Treble Cove Road, Building 1, North Billerica, Massachusetts. As a result of the relocation, product revenues were negatively impacted during 2024. The factory relocation also necessitated construction activities to install equipment test cells and comply with local regulations. We resumed manufacturing operations during the latter-half of the third quarter of 2024.
Impact of Anti-fossil Fuel Sentiment
In some key markets such as New York City, the regulatory push to eliminate fossil fuels from buildings has impacted cogeneration unit sales. We believe that as regulations take into account scope 2 emissions and products like our hybrid chiller that can choose the cleanest fuel source will have a significant advantage in decarbonization efforts. The political environment following the 2024 elections in the United States may have a material impact on anti-fossil fuel sentiment and the regulatory environment that may be favorable to our business. We have also diversified our sales activities to reduce our reliance on markets like New York City.
Impact of Utility Power Constraints, Data Center Construction
As more load is added to the utility grid in the form of data centers, EV charging, and other demands for power, customers are facing power constraints. Tecogen believes that these power constrained customers, in particular data centers and industrial facilities, represent a significant opportunity for growth. The customer need is driven by the ability to expand an existing facility or open a new facility quickly while taking advantage of utility expense savings long term. Our chiller products can reduce the electrical capacity needed on-site by 30% or more. Our InVerde product can provide on-site power generation which allows customers to eliminate long lead times associated with electrical switch gear and bridge any short fall in power from the utility.
Residual Impacts of Covid-19 Pandemic
Supply chains were adversely impacted during Covid, resulting in significant delays or lack of availability of critical components such as engines. This has continued to have long term impact on product and service margins. The direct impact
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has been certain costs increasing faster than inflation. The indirect impact is from increased engine related costs in the service segment as replacements were deferred or overhauled components were used due to lack of parts. We have instituted a service price increase and have also been making engineering improvements to increase service intervals to increase gross margins.
Tecochill Hybrid-Drive Air-Cooled Chiller Development
During the third quarter of 2021, we began development of the Tecochill Hybrid-Drive Air-Cooled Chiller. We recognized that there were many applications where the customer wanted an easy to install rooftop chiller. Using the inverter design from our InVerde e+ cogeneration module, the system can simultaneously take two inputs, one from the grid or a renewable energy source and one from our natural gas engine. This allows a customer to seek the optimum blend of operational cost savings and greenhouse gas benefits while providing added resiliency from two power sources. We introduced the Tecochill Hybrid-Drive Air-Cooled Chiller at the AHR Expo in February 2023 and received an order on February 8, 2024 for three hybrid-drive air-cooled chillers for a utility company in Florida. In March 2024, the US Patent and Trademark Office granted patent 11,936,327: "Hybrid Power System With Electric Generator and Auxiliary Power Source." Initial shipments of the hybrid-drive air-cooled chiller were delivered to customers in the second quarter of 2025.
Controlled Environment Agriculture
On July 20, 2022, we announced our intention to focus on opportunities for the use of our cogeneration equipment in low carbon Controlled Environment Agriculture ("CEA"). We believe that CEA offers an exciting opportunity to apply our expertise in clean cooling, power generation, and greenhouse gas reduction to address critical issues affecting food and energy security. Food crops grown in greenhouses typically have lower yields per square foot than in CEA facilities where yields are increased by supplementing or replacing natural light with grow lights in a climate-controlled environment, requiring significant energy use. In recent years, our cogeneration equipment has been used in numerous cannabis cultivation facilities because our systems reduce the facility's need for power, significantly reduce operating costs and the facility GHG footprint, and offer resiliency to grid outages. Our experience providing clean energy solutions to cannabis cultivation facilities has given us significant insight into requirements relating to energy-intensive indoor agriculture applications that we expect to be transferable to CEA facilities for food production.
Impact of Geopolitical Tensions
We have no operations or customers in Russia, the Ukraine, or in the Middle East. The higher energy prices for natural gas as a result of the wars in Ukraine and the Middle East may affect the performance of our Energy Production Segment and the cost differential between grid generated energy and natural gas sourced energy using our cogeneration equipment. However, we have also seen higher electricity prices as much of the electricity production in the United States is generated from fossil fuels. If electricity prices continue to rise, the economic savings generated by our products are likely to increase. In addition to the direct result of changes in natural gas and electricity prices, the war in Ukraine and the conflict in the Middle East may result in higher cybersecurity risks, increased or ongoing supply chain challenges, and volatility related to the trading prices of commodities.
Impact of Tariffs
The majority of our vendors are domestic. Although we have some exposure to Chinese and European suppliers, we do not anticipate any increases in tariffs to materially affect our operations.
Related Party Notes
On October 9, 2023, we entered into note subscription agreements with each of John N. Hatsopoulos and Earl R. Lewis, III, each a director and shareholder of the Company, pursuant to which Mr. Hatsopoulos agreed to provide financing to us of up to $1,000,000, and Mr. Lewis agreed to provide financing to us of $500,000, and potentially, an additional $500,000 at his discretion. On October 10, 2023, we borrowed $500,000 from Mr. Hatsopoulos and issued him a one-year promissory note with interest accruing at 5.12% per annum. On July 23, 2024, we borrowed an additional $500,000 from Mr. Hatsopoulos, and issued a one-year promissory note with interest accruing at 5.06% per annum. On March 21, 2024, Mr. Hatsopoulos amended the terms of the promissory note, dated October 10, 2023, extending the maturity date by one-year, making the maturity date October 10, 2025. On September 18, 2024, we borrowed $500,000 from Mr. Lewis and issued him a one-year promissory note with interest accruing at 4.57% per annum.
On January 14, 2025, we agreed to permit Mr. Lewis to either receive repayment of his note in cash or, at his discretion, convert the balance of the promissory note into shares of our common stock. In the event of such a conversion, the number of shares of we will be required to issue will be determined by dividing the balance due under the promissory note by the average closing price per share of our shares during the thirty-day period prior to the date of conversion.
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TECOGEN INC.
On May 1, 2025, Mr. Lewis elected to convert the promissory note we issued to him in connection with his loan to us in the principal amount of $500,000 together with $14,148 of accrued and unpaid interest into 240,256 shares of our common stock at a per share price of $2.14. The number of shares was determined by dividing the balance due under the promissory note by the average closing price per share of our shares during the thirty-day period prior to the date of conversion. At June 30, 2025 our obligation to Mr. Lewis under the promissory note was retired.
On February 18, 2025, we amended the promissory notes with Mr. Hatsopoulos to extend the maturity dates for both promissory notes to July 31, 2026. We also agreed to permit Mr. Hatsopoulos to either receive repayment of his notes in cash, or at his discretion, convert the balance(s) due of one or both of the promissory notes into shares of our common stock. In the event of such a conversion, the number of shares we will be required to issue will be determined by dividing the balance(s) due under the promissory note(s) by the average closing price per share of our shares during the thirty-day period prior to the date of conversion.
See "Note 11. Related Party Notes " of the Notes to Condensed Consolidated Financial Statements.
Overview
Tecogen designs, manufactures, markets, and maintains high efficiency, ultra-clean cogeneration products. These include natural gas engine driven combined heat and power (CHP) systems, chillers and heat pumps for multi-family residential, commercial, recreational and industrial use. We are known for products that provide customers with substantial energy savings, resiliency from utility power outages and for significantly reducing a customer’s carbon footprint. Our products are sold with our patented Ultera® technology which nearly eliminates all criteria pollutants such as NOx and CO. Our systems are greater than 88% efficient compared to typical electrical grid efficiencies of 40% to 50%. As a result, our greenhouse gas (GHG) emissions per KwH are typically half that of the electrical grid. Our systems generate electricity and hot water or in the case of our Tecochill product, both chilled water and hot water. These result in savings of energy related costs of up to 60% for our customers. Our products are expected to run on Renewable Natural Gas (RNG) as it is introduced into the US gas pipeline infrastructure.
Our products are sold directly to end-users by our in-house sales team and by established sales agents and representatives. We have agreements in place with distributors and sales representatives. Our existing customers include hospitals and nursing homes, colleges and universities, health clubs and spas, hotels and motels, office and retail buildings, food and beverage processors, multi-unit residential buildings, laundries, ice rinks, swimming pools, factories, municipal buildings, military installations and indoor growing facilities. To date we have shipped over 3,200 units, some of which have been operating for almost 35 years.
With the acquisition of American DG Energy Inc. ("ADGE") in May 2017, we added an additional source of revenue. Through ADGE, we install, own, operate and maintain complete distributed generation electricity systems, or DG systems or energy systems, and other complementary systems at customer sites, and sell electricity, hot water, heat and cooling energy under long-term contracts at prices guaranteed to the customer to be below conventional utility rates. Each month we obtain readings from our energy meters to determine the amount of energy produced for each customer. We use a contractually defined formula to multiply these readings by the appropriate published price of energy (electricity, natural gas or oil) from each customer's local energy utility to derive the value of our monthly energy sale, which includes a negotiated discount. Our revenues per customer on a monthly basis vary based on the amount of energy produced by our energy systems and the published price of energy (electricity, natural gas or oil) from our customer's local energy utility that month.
Our operations are comprised of three business segments. Our Products segment designs, manufactures and sells industrial and commercial cogeneration systems. Our Services segment provides operations and maintenance services ("O&M") for our products under long term service contracts. Our Energy Production segment sells energy in the form of electricity, heat, hot water and cooling to our customers under long-term sales agreements.


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TECOGEN INC.
Results of Operations

Second Quarter of 2025 Compared to Second Quarter of 2024

The following table sets forth for the periods indicated, the percentage of net sales represented by certain items reflected in our condensed consolidated statements of operations:

Three Months Ended
June 30, 2025June 30, 2024
Revenues100.0 %100.0%
Cost of sales66.2 %56.0%
Gross profit33.8 %44.0%
Operating expenses
General and administrative42.4 %61.3%
Selling7.1 %8.6%
Research and development3.7 %5.2%
Gain on sale of assets— %0.1%
Total operating expenses53.1 %75.2%
Loss from operations(19.4)%(31.2)%
Total other expense, net(0.6)%(0.8)%
Loss before income taxes(20.0)%(31.9)%
Provision for state income taxes0.2 %— %
Consolidated net loss(20.2)%(31.9)%
(Income) loss attributable to the non-controlling interest0.1 %(0.6)%
Net loss attributable to Tecogen, Inc.(20.1)%(32.5)%

Revenues

The following table presents revenue for the periods indicated, by segment and the change from the prior year:
Three Months Ended
June 30, 2025June 30, 2024Increase (Decrease) $Increase (Decrease) %
REVENUE:
Products
Cogeneration$1,066,835 $119,673 $947,162791.5 %
Chiller2,015,893 — 2,015,893— %
Engineered accessories72,595 — 72,595— %
Total product revenues3,155,323 119,673 3,035,6502,536.6 %
Services3,965,168 4,126,517 (161,349)(3.9)%
Energy production174,329 481,597 (307,268)(63.8)%
Total revenues$7,294,820 $4,727,787 $2,567,03354.3 %

    Total revenues for the three months ended June 30, 2025 were $7,294,820 compared to $4,727,787 for the same period in 2024, an increase of $2,567,033 or 54.3% year over year.

    

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TECOGEN INC.

Products
    Products revenues in the three months ended June 30, 2025, were $3,155,323 compared to $119,673 for the same period in 2024, an increase of $3,035,650, or 2,536.6%. The increase in revenue during the three months ended June 30, 2025 is due to an increase in chiller sales of $2,015,893, which included the initial deliveries of our hybrid-drive air-cooled chiller, an increase in cogeneration sales of $947,162, and an increase in engineered accessory sales of $72,595. Products revenue in the three months ended June 30, 2024, were impacted due to the relocation of our manufacturing operations in April 2024, which significantly reduced our production capacity. Our Products sales mix, as well as product revenue, can vary significantly from period to period as our products are high dollar, low volume sales.
Services
    Service revenues in the three months ended June 30, 2025 were $3,965,168, compared to $4,126,517 for the same period in 2024, a decrease of $161,349, or 3.9%. The decrease in revenue during the three months ended June 30, 2025 is due to a $152,049 decrease in revenues from the acquired Aegis maintenance contracts and a $9,300 decrease in revenues from existing service contracts.
Our service operation revenues grow with the sale of installed systems, since the majority of our product sales are accompanied by a service contract or time and materials agreements. As a result, our “fleet” of units being serviced by our service department grows with product sales.
    Energy Production
    Energy Production revenues in the three months ended June 30, 2025 were $174,329, compared to $481,597 for the same period in 2024, a decrease of $307,268, or 63.8%. The decrease in Energy Production revenue is due to the expiration of several energy production contracts in late 2024 and the temporary shutdown of a few energy production sites for repairs in the three months ended June 30, 2025.
Cost of Sales
    Cost of sales in the three months ended June 30, 2025, was $4,832,328 compared to $2,648,632 for the same period in 2024, an increase of $2,183,696, or 82.4%. The increase in cost of sales is due to increased product shipments and increased service contract maintenance costs due to higher labor and material costs. During the three months ended June 30, 2025, our gross margin decreased to 33.8% compared to 44.0% for the same period in 2024, a 10.2% percentage point decrease due to increased labor and material costs incurred in both Products and Services.
    Products
Cost of sales for Products in the three months ended June 30, 2025, was $2,232,155 compared to $171,982 for the same period in 2024, an increase of $2,060,173, or 1,197.9% due to increased sales of Products and higher material and labor costs. Products revenue and cost of sales in the three months ended June 30, 2024, were impacted due to the relocation of our manufacturing operations in April 2024, which significantly reduced our production capacity. During the three months ended June 30, 2025, our Products gross margin was 29.3% compared to (43.7)% for the same period in 2024, a 73.0% percentage point increase. The increase in margin is due to increased revenues in 2025.
Services
Cost of sales for Services in the three months ended June 30, 2025, was $2,469,737 compared to $2,191,815 for the same period in 2024, an increase of $277,922, or 12.7%, due to increased labor and material costs. During the three months ended June 30, 2025, our Services gross margin decreased to 37.7% compared to 46.9% in the same period in 2024, a 9.2% percentage point decrease. The decrease in gross margin percent is due to increased labor and material costs incurred in 2025.
    Energy Production     
    Cost of sales for Energy Production in the three months ended June 30, 2025, was $130,436 compared to $284,835 for the same period in 2024, a decrease of $154,399, or 54.2%. During the three months ended June 30, 2025, our Energy Production gross margin decreased to 25.2% compared to 40.9% for the same period in 2024, a 15.7% percentage point decrease. The decrease in the energy production gross margin is due to increased repair costs incurred to restart energy production sites which were shut down for repairs in the three months ended June 30, 2025, compared to the same period in 2024.
Operating Expenses
Operating expenses increased $321,232, or 9.0%, to $3,874,354 in the three months ended June 30, 2025 compared to $3,553,122 in the same period in 2024.
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TECOGEN INC.
Three Months Ended
Operating ExpensesJune 30, 2025June 30, 2024Increase (Decrease) $Increase (Decrease) %
General and administrative$3,091,175 $2,897,993 $193,182 6.7 %
Selling514,735 405,277 109,458 27.0 %
Research and development268,724 246,489 22,235 9.0 %
(Gain) loss on disposition of assets(280)3,363 (3,643)(108.3)%
Total$3,874,354 $3,553,122 $321,232 9.0 %

    General and administrative expenses consist of executive staff, accounting and legal expenses, office space, general insurance and other administrative expenses. General and administrative expenses for the three months ended June 30, 2025 were $3,091,175 compared to $2,897,993 for the same period in 2024, an increase of $193,182 or 6.7%, due to a $174,976 increase in payroll, benefits and recruitment costs, a $66,604 increase in professional fees, a $62,690 increase in depreciation and amortization, and a $44,818 increase in travel and vehicles expense, offset partially by a $61,565 decrease in facility costs, due to the transition to our new facility in 2024, relocation cost of $83,055 incurred in 2024, and a $15,985 decrease in insurance premiums.
    Selling expenses consist of sales staff, commissions, marketing, travel and other selling related expenses. Selling expenses for the three months ended June 30, 2025, were $514,735 compared to $405,277 for the same period in 2024, an increase of $109,458 or 27.0%, due to a $115,811 increase in sales commission, offset partially by a $29,197 reduction in payroll and related benefit costs.
    Research and development expenses consist of engineering and technical staff, materials, outside consulting and other related expenses. Research and development expenses for the three months ended June 30, 2025, were $268,724 compared to $246,489 for the same period in 2024, an increase of $22,235 or 9.0%, due to a $32,665 increase and payroll and related benefit costs, offset partially by a $11,459 decrease in patent related legal fees.
The gain on asset dispositions for the three months ended June 30, 2025, was $280 compared to a loss on asset dispositions of $3,363 for the three months ended June 30, 2024.
Income (loss) from Operations
    Our loss from operations for the three months ended June 30, 2025, was $1,411,862 compared to a loss from operations of $1,473,967 for the same period in 2024, a decrease of $62,105, or 4.2%. The decrease is due to higher Products and Services segment revenues and increased gross profit, offset partially by a $321,232 increase in operating expenses.
Other Income (Expense), net
    Other expense, net for the three months ended June 30, 2025, was $44,531 compared to other expense net of $36,472 for the same period in 2024, an increase of $8,059, due to a $20,284 increase in interest expense due to borrowings under our related party notes and lease financing and a $25,272 increase in currency exchange losses, offset partially by a decrease of $37,497 in unrealized losses on marketable securities in the three months ended June 30, 2025.
Provision for State Income Taxes
    The provision for state income taxes for the three months ended June 30, 2025 and 2024 was $16,762 and $37, respectively, and represents estimated income tax payments, net of refunds, to various states.
Non-controlling Interest
    The loss attributable to the non-controlling interest was $9,050 for the three months ended June 30, 2025, which represents the non-controlling interest portion of American DG Energy's 51% owned subsidiary, American DG New York, LLC. For the same period in 2024, income attributable to the non-controlling interest was $28,320. The loss in the three months ended June 30, 2025, is attributable to the expiration of an Energy Production contract at one of the Energy Production sites and the temporary shutdown of a site for repairs.
Net Income (loss) Attributable to Tecogen Inc.
    The net loss attributable to Tecogen for the three months ended June 30, 2025, was a net loss of $1,464,105 compared to a net loss of $1,538,796 for the same period in 2024, a decrease of $74,691, or 4.9%. The decrease in the net loss is due to increased revenue and gross profit from our Products and Services segments, offset partially by a $321,232 increase in operating expenses.

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TECOGEN INC.


Six Months Ended June 30, 2025 Compared to the Six Months Ended June 30, 2024

The following table sets forth for the periods indicated, the percentage of net sales represented by certain items reflected in our condensed consolidated statements of operations:

Six Months Ended
June 30, 2025June 30, 2024
Revenues100.0%100.0%
Cost of sales61.0%57.3%
Gross profit39.0%42.7%
Operating expenses
General and administrative41.3%52.7%
Selling7.6%8.6%
Research and development3.9%4.6%
(Gain) loss on disposition of assets3.9%4.6%
Total operating expenses52.8%65.8%
Loss from operations(13.8)%(23.1)%
Total other income (expense), net(0.8)%(0.5)%
Consolidated net loss before taxes(14.5)%(23.6)%
Provision for state income taxes0.1 %0.2 %
Consolidated net loss(14.6)%(23.8)%
(Income) loss attributable to the noncontrolling interest0.1 %(0.4)%
Net loss attributable to Tecogen, Inc.(14.6)%(24.2)%

Revenues

The following table presents revenue for the periods indicated, by segment and the change from the prior year:
Six Months Ended
June 30, 2025June 30, 2024Increase (Decrease) $Increase (Decrease) %
REVENUE:
Products
Cogeneration$2,147,204 $893,902 $1,253,302 140.2 %
Chiller3,390,090 657,061 2,733,029 415.9 %
Engineered accessories151,838 60,108 91,730 152.6 %
Total product revenues5,689,132 1,611,071 4,078,061 253.1 %
Services8,210,190 8,140,827 69,363 0.9 %
Energy production673,268 1,161,985 (488,717)(42.1)%
Total revenues$14,572,590 $10,913,883 $3,658,707 33.5 %

    Total revenues for the six months ended June 30, 2025 were $14,572,590 compared to $10,913,883 for the same period in 2024, an increase of $3,658,707 or 33.5% year over year.


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TECOGEN INC.
Products
Products revenues in the six months ended June 30, 2025, were $5,689,132 compared to $1,611,071 for the same period in 2024, an increase of $4,078,061, or 253.1%. The increase in revenue during the six months ended June 30, 2025 is due to an increase in chiller sales of $2,733,029, which included the initial deliveries of our hybrid-drive air-cooled chiller, an increase in cogeneration sales of $1,253,302, and an increase in engineered accessory sales of $91,730. Products revenue in the six months ended June 30, 2024, were impacted due to the relocation of our manufacturing operations in April 2024, which significantly reduced our production capacity. Our Products sales mix, as well as product revenue, can vary significantly from period to period as our products are high dollar, low volume sales.
Services
    Service revenues in the six months ended June 30, 2025, were $8,210,190, compared to $8,140,827 for the same period in 2024, an increase of $69,363, or 0.9%. The increase in revenue during the six months ended June 30, 2025, is due to a $287,882 increase in revenues from existing service contracts, offset by a $218,519 reduction in revenue from the acquired Aegis maintenance contracts.
Our service operation revenues grow with the sale of installed systems, since the majority of our product sales are accompanied by a service contract or time and materials agreements. As a result, our “fleet” of units being serviced by our service department grows with product sales.
    Energy Production
    Energy Production revenues in the six months ended June 30, 2025, were $673,268, compared to $1,161,985 for the same period in 2024, a decrease of $488,717, or 42.1%. The decrease in Energy Production revenue is due to the expiration of several energy production contracts in late 2024 and the temporary shutdown of a few energy production sites for repairs in the six months ended June 30, 2025.
Cost of Sales
    Cost of sales in the six months ended June 30, 2025, was $8,889,058 compared to $6,259,072 for the same period in 2024, an increase of $2,629,986, or 42.0%. The increase in cost of sales is due to increased product shipments and increased service contract maintenance costs due to higher labor and material costs. During the six months ended June 30, 2025, our gross margin decreased to 39.0% compared to 42.7% for the same period in 2024, a 3.7% percentage point decrease due to higher services labor and material costs.
    Products
Cost of sales for Products in the six months ended June 30, 2025, was $3,719,905 compared to $1,221,525 for the same period in 2024, an increase of $2,498,380, or 204.5% due to increased sales of Products and higher labor and material costs. During the six months ended June 30, 2025, our Products gross margin was 34.6% compared to 24.2% for the same period in 2024, a 10.4% percentage point increase. The increase in margin is due to increased revenues in 2025.
Services
Cost of sales for Services in the six months ended June 30, 2025 was $4,728,635 compared to $4,284,072 for the same period in 2024, an increase of 444,563, or 10.4%, due to increased labor and material costs. During the six months ended June 30, 2025, our Services gross margin decreased to 42.4% compared to 47.4% in the same period in 2024, a 5.0% percentage point decrease. The decrease in gross margin percent is due to increased labor and material costs incurred in 2025.
    Energy Production     
    Cost of sales for Energy Production in the six months ended June 30, 2025, was $440,518 compared to $753,475 for the same period in 2024, a decrease of $312,957, or 41.5%. During the six months ended June 30, 2025, our Energy Production gross margin decreased to 34.6% compared to 35.2% for the same period in 2024, a 0.6% percentage point decrease. The decrease in the energy production gross margin is due to lower revenue and increased repair costs incurred to restart energy production sites which were shut down for repairs in the six months ended June 30, 2025, compared to the same period in 2024.
Operating Expenses
Operating expenses increased $510,976, or 7.1%, to $7,689,638 in the six months ended June 30, 2025, compared to $7,178,662 in the same period in 2024.
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TECOGEN INC.
Six Months Ended
Operating ExpensesJune 30, 2025June 30, 2024Increase (Decrease) $Increase (Decrease) %
General and administrative$6,019,310 $5,746,559 $272,751 4.7 %
Selling1,109,216 934,946 174,270 18.6 %
Research and development561,392 501,185 60,207 12.0 %
Gain on disposition of assets(280)(4,028)3,748 (93.0)%
Total$7,689,638 $7,178,662 $510,976 7.1 %

    General and administrative expenses consist of executive staff, accounting and legal expenses, office space, general insurance and other administrative expenses. General and administrative expenses for the six months ended June 30, 2025, were $6,019,310 compared to $5,746,559 for the same period in 2024, an increase of $272,751 or 4.7%, due to a $442,589 increase in payroll, benefits and recruitment costs, a $106,741 increase in depreciation and amortization, and a $100,770 increase in travel and vehicles expense, offset partially by a $198,292 decrease in facility costs, due to the transition to our new facility in 2024, a $94,063 reduction in credit losses, due to the recovery of $75,000 recognized in 2025 and relocation costs of $83,055 incurred in 2024, a $58,688 reduction in professional fees and a $29,321 decrease in insurance premiums.
    Selling expenses consist of sales staff, commissions, marketing, travel and other selling related expenses. Selling expenses for the six months ended June 30, 2025, were $1,109,216 compared to $934,946 for the same period in 2024, an increase of $174,270 or 18.6%, due to a $235,310 increase in sales commission, offset partially by a $80,855 reduction in payroll and related benefit costs.
    Research and development expenses consist of engineering and technical staff, materials, outside consulting and other related expenses. Research and development expenses for the six months ended June 30, 2025, were $561,392 compared to $501,185 for the same period in 2024, an increase of $60,207 or 12.0%, due to a $75,571 increase and payroll and related benefit costs.
The gain on asset dispositions for the six months ended June 30, 2025 was $280 compared to $4,028 for the six months ended June 30, 2024.
Income (loss) from Operations
    Our loss from operations for the six months ended June 30, 2025, was $2,006,106 compared to a loss from operations of $2,523,851 for the same period in 2024, a decrease of $517,745, or 20.5%. The decrease is due to higher Products and Services segment revenues and increased gross profit, offset partially by a $510,976 increase in operating expenses.
Other Income (Expense), net
    Other expense, net for the six months ended June 30, 2025, was $109,851 compared to other expense net of $52,141 for the same period in 2024, an increase of $57,710, due to a $33,940 increase in interest due to borrowings under our related party notes and lease financing and a $23,770 increase in currency exchange losses in the six months ended June 30, 2025.
Provision for State Income Taxes
    The provision for state income taxes for the six months ended June 30, 2025 and 2024 was $17,687 and $22,100, respectively, and represents estimated income tax payments, net of refunds, to various states.
Non-controlling Interest
The loss attributable to the non-controlling interest was $9,617 for the six months ended June 30, 2025, which represents the non-controlling interest portion of American DG Energy's 51% owned subsidiary, American DG New York, LLC. For the same period in 2024, income attributable to the non-controlling interest was $45,671. The loss in the six months ended June 30, 2025, is attributable to the expiration of a contract at one of the Energy Production sites and the temporary shutdown of a site for repairs.
Net Income (loss) Attributable to Tecogen Inc.
The net loss attributable to Tecogen Inc., for the six months ended June 30, 2025, was a net loss of $2,124,027 compared to a net loss of $2,643,763 for the same period in 2024, a decrease of $519,736, or 19.7%. The decrease in the net loss is due to increased revenue and gross profit from our Products and Services segments, offset partially by a $510,976 increase in operating expenses.

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TECOGEN INC.

Liquidity and Capital Resources

Sources of Liquidity
During the six months ended June 30, 2025, we incurred a loss from operations of $2,006,106 compared to a net loss from operations of $2,523,851 in the same period in 2024. Cash flows from operations decreased $3,865,917 during the six months ended June 30, 2025, compared to the same period in 2024. As of June 30, 2025, we had cash and cash equivalents of $1,640,864 compared to cash and cash equivalents of $5,405,233 as of December 31, 2024, a decrease of $3,764,369 or 69.6%, and an accumulated deficit as of June 30, 2025, of $49,763,921. In addition to cash from operations, we have relied upon loans from related parties to help fund our operations. See Note 11. Related Party Notes of the Notes to the Condensed Consolidated Financial Statements and "Recent Developments - Related Party Notes," above.
On July 21, 2025, we closed on a firm commitment underwitten public offering of 3,985,000 shares of common stock,$0.001 par value per share ("Common Stock"), including an additional 485,000 shares of common stock to cover over-allotments, at a price to the public of $5.00 per share, pursuant to an underwriting agreement, dated July 18, 2025, between us and Roth Capital Partners, LLC, as sole underwriter and manager for the offering. The net proceeds of the offering, after deducting underwriting discounts and commissions and estimated offering expenses were approximately $18,160,750. See "Note 14. Subsequent Events" to the Notes to the Condensed Consolidated Financial Statements.
Cash Flows

The following table presents a summary of our net cash flows from operating, investing and financing activities:

Six Months Ended
Cash Provided by (Used in)June 30, 2025June 30, 2024Increase (Decrease)
Operating activities$(3,775,620)$90,297 $(3,865,917)
Investing activities(320,665)(569,077)248,412 
Financing activities331,916 (30,577)362,493 
Change in cash and cash equivalents$(3,764,369)$(509,357)$(3,255,012)

Consolidated working capital at June 30, 2025, was $5,070,741 compared to $5,329,650 at December 31, 2024, a decrease of $258,909, or 4.9%. Included in working capital were cash and cash equivalents of $1,640,864 at June 30, 2025, compared to $5,405,233 at December 31, 2024, a decrease of $3,764,369, or 69.6%.
Cash Flows from Operating Activities
    Cash used by operating activities for the six months ended June 30, 2025, was $3,775,620 compared to cash generated of $90,297 by operating activities for the same period in 2024, a decrease of $3,865,917. Our accounts receivable and unbilled revenue balances were $6,640,483 and $126,738, respectively, at June 30, 2025, compared to $6,026,545 and $398,898 at December 31, 2024, using $266,778 of cash.
Accounts payable increased to $4,946,218 as of June 30, 2025, from $4,142,678 at December 31, 2024, providing $803,540 in cash flow from operations. The increase in accounts payable is due to increased material procurement in anticipation of future Products shipments. Deferred revenue decreased to $5,673,475 as of June 30, 2025, compared to $7,867,082 as of December 31, 2024, due to the application of customer deposits against accounts receivables as Products ship, using $2,193,607 of cash from operations. We expect accounts payable and deferred revenue to fluctuate with routine changes in operations.
Cash Flows from Investing Activities
During the six months ended June 30, 2025, we used $277,989 of cash to purchase property, plant and equipment, primarily for improvements required at the North Billerica facility, and distributed $42,956 to the 49% non-controlling interest holders of American DG New York LLC. During the six months ended June 30, 2024, we used $556,636 of cash for improvements required to the North Billerica facility and received $36,213 in proceeds from the disposition of assets, including insurance proceeds.

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TECOGEN INC.
Cash Flows from Financing Activities
During six months ended June 30, 2025, we used $63,010 of cash in payment of finance lease principal and received $394,926 of proceeds from the exercise of stock options. During the six months ended June 30, 2024, we used $30,577 of cash in payment of finance lease principal.
Backlog
As of June 30, 2025, our backlog of product and installation projects, excluding service contracts, was $6,215,443, consisting of $6,215,443 of purchase orders received by us. As of June 30, 2024, our backlog of product and installation projects, excluding service contracts, was $5,121,551 consisting of $4,681,231 of purchase orders received by us and $440,320 of projects in which the customer's internal approval process is complete, financial resources have been allocated, and the customer has made a firm verbal commitment that the order is in the process of execution. Backlog at the beginning of any period is not necessarily indicative of future performance. Our presentation of backlog may differ from other companies in our industry.
Liquidity
At June 30, 2025, we had cash and cash equivalents of $1,640,864, a decrease of $3,764,369 or 69.6% from the cash and cash equivalents balance at December 31, 2024.
On July 21, 2025, we closed on a firm commitment underwitten public offering of 3,985,000 shares of common stock, $.001 par value per share ("Common Stock"), including an additional 485,000 shares of common stock to cover over-allotments, at a price to the public of $5.00 per share, pursuant to an underwriting agreement, dated July 18, 2025, between us and Roth Capital Partners, LLC, as sole underwriter and manager for the offering. The net proceeds of the offering, after deducting underwriting discounts and commissions and estimated offering expenses were approximately $18,160,750. See "Note 14. Subsequent Events" to the Notes to the Condensed Consolidated Financial Statements.

Significant Accounting Policies and Critical Estimates
Our significant accounting policies are discussed in the Notes to our Consolidated Financial Statements in our Annual Report on Form 10-K for the year ended December 31, 2024. The accounting policies and estimates that can have a significant impact upon our operating results, financial position and footnote disclosures are described in the above notes and in the Annual Report.

Significant New Accounting Standards or Updates Not Yet Effective    
    The Company's critical accounting policies have remained consistent with the policies disclosed in our Annual Report on Form 10-K for the year ended December 31, 2024, filed with the SEC on March 18, 2025.
    See Note 1, Description of Business and Basis of Presentation, to the Condensed Consolidated Financial Statements included elsewhere in this Quarterly Report on Form 10-Q.
Seasonality
The majority of our chilling systems sold are operational during the summer. Demand for our service team is higher in the warmer months when cooling is required. Chiller units are generally shut down in the winter and started up again in the spring. The chiller "busy season' for the service team generally runs from May through the end of September. Our cogeneration sales are not generally affected by seasonality.
Off-Balance Sheet Arrangements
Currently, we do not have any material off-balance sheet arrangements, including any outstanding derivative financial instruments, off-balance sheet guarantees, interest rate swap transactions or foreign currency contracts. We do not engage in trading activities involving non-exchange traded contracts.
Item 3. Quantitative and Qualitative Disclosures About Market Risk.
Not applicable.
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TECOGEN INC.
Item 4. Controls and Procedures.
Management’s Evaluation of Disclosure Controls and Procedures:
As of the end of the period covered by this Report, our Chief Executive Officer and Chief Financial Officer ("Certifying Officers") conducted evaluations of our disclosure controls and procedures. As defined in Rule 13a-15(e) and 15d-15(e) under Securities Exchange Act of 1934, as amended ("Securities Exchange Act"), the term "disclosure controls and procedures" means controls and procedures of an issuer that are designed to ensure the information required to be disclosed by the issuer in the reports that it files or submits under Section 13(a) or 15(d) is recorded, processed, summarized and reported within the time periods specified in the Securities and Exchange Commission's ("SEC") rules and forms. Disclosure controls and procedures include, without limitation, controls and procedures designed to ensure that information required to be disclosed by an issuer in the reports that it files or submits under Section 13(a) or 15(d) of the Securities Exchange Act is accumulated and communicated to the issuer's management, including the Certifying Officer, to allow timely decisions regarding required disclosure.
Our disclosure controls and procedures are designed to provide reasonable assurance that the control system’s objectives will be met. Our management, including our Chief Executive Officer and Chief Financial Officer, after evaluating the effectiveness of our disclosure controls and procedures as of the end of the period covered by this Report, has concluded that our disclosure controls and procedures were not effective due to a material weakness with respect to a small number of individuals dealing with general controls over information technology. Management will continue to evaluate the above weaknesses and we are taking steps to remediate the weaknesses as resources become available.
Remediation
We are committed to remediating the material weakness identified in internal controls over financial reporting and have begun the process to remediate this material weakness. Our efforts will focus on instituting mitigating controls to address segregation of duties; hiring of additional staff; implementing additional controls to address system access deficiencies; implementing additional controls over business operations; establish independent review and verification procedures for our vendor and customer master files; enhance the documentation to support review occurrences and approval procedures; and, commence regular periodic reviews of our internal controls over financial reporting with our Board of Directors and Audit Committee to address the inadequate risk oversight function and institute procedures to evaluate and report on risks to financial reporting, including the documentation and completion of a comprehensive risk assessment to identify all potential risk areas and evaluate the adequacy of our controls to mitigate these risks.
Changes in Internal Control over Financial Reporting:
There were no changes in our internal controls over financial reporting (as such term is defined in Rules 13a-15(f) and 15d-15(f) under the Securities Exchange Act) during the period covered by this Report that have materially affected, or are reasonably likely to materially affect, our internal controls over financial reporting.
PART II - OTHER INFORMATION
Item 1. Legal Proceedings
Except as described below, we and our subsidiaries and our properties are not parties to any material pending legal proceedings, other than ordinary routine litigation incidental to our business.
On November 23, 2022, we were served with a suit filed against us on August 24, 2022 in the Ontario Superior Court of Justice by The Corporation of the Town of Milton, Milton Energy Generation Solutions Inc. and Milton Hydro Distribution Inc. (the "Plaintiffs"), all of whom are municipal corporations incorporated in the Province of Ontario. The plaintiffs sued for damages in the amount of CDN $1,000,000, prejudgment and post-judgment interest, and legal fees, alleging breach of contract, breach of warranty, negligent misrepresentations and nuisance. Plaintiffs allege that on or about July 10, 2022, a Tecogen cogeneration unit installed by us at the plaintiffs facility caught fire, causing damage to the cogeneration unit and the plaintiff's facility. We filed a response denying liability and are represented by Canadian counsel. For the year ended December 31, 2022, we reserved $150,000 for anticipated damages which may not be covered by our insurance and maintained the reserve at December 31, 2024. On January 13, 2025, Tecogen and our insurers entered into a Settlement Agreement and Full and Final Release from any and all claims, obligations and liabilities, arising from the July 10, 2022 fire in the amount of CDN $400,000, of which we were responsible for CDN $100,000. On February 7, 2025, we remitted CDN $100,000, or $70,994, representing payment in full of our liability relating to this matter and recorded a benefit of $79,006 in our condensed consolidated statements of operations in the six months ended June 30, 2025.
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TECOGEN INC.
Item 1A. Risk Factors    
In addition to the risks described below, you should carefully consider the factors discussed under "Item1A - Risk Factors” in our Annual Report on Form 10-K for our fiscal year ended December 31, 2024 ("2024 Form 10-K") and in our Quarterly Report on Form 10-Q for the quarter ended March 31, 2025 (“March 31, 2025 Form 10-Q”). The risks discussed in our 2024 Form 10-K and in our March 31, 2025 Form 10-Q could materially affect our business, financial condition and future results. The risks described in our 2024 Form 10-K and in our March 31, 2025 Form 10-Q and the risks described below are not the only risks we face. Additional risks and uncertainties not currently known to us or that we currently deem to be immaterial also may materially and adversely affect our business, financial condition or operating results.

Risks Related to Our Business and Financial Condition
We incurred a net loss of $2,124,027 during the six months ended June 30, 2025, compared to a loss of $2,643,763 in the same period in 2024. We have a history of incurring losses from our operations and there can be no assurance we will be able to increase our revenues, manage our expenses and cash flows, and become profitable in the future.
We incurred a net loss of $2,124,027 during the six months ended June 30, 2025, compared to a net loss of $2,643,763 in the six months ended June 30, 2024. Historically, we have incurred net losses, including a net loss of $4,760,238 for the year ended December 31, 2024, and, as of June 30, 2025, we had an accumulated deficit of $49,763,921. Our business is capital intensive and, because our products are built to order with customized configurations, the lead time to build and deliver a unit can be significant. We may be required to purchase key components long before we can deliver a unit and receive payment. Changes in customer orders or lack of demand may also impact on our profitability. There can be no assurance we will be able to increase our sales and achieve and sustain profitability in the future. Our cash flows from operations are insufficient to fund our business and, currently, we are reliant upon financing provided by related parties to help fund our operations.
Risks Related to Ownership of Our Securities
As of the end of the period covered by our Quarterly Report on Form 10-Q for the quarter ended June 30, 2025, our principal executive officer and our principal financial officer concluded there is a material weakness in our disclosure controls and procedures and our internal control over financial reporting. If we are unable to remediate these material weaknesses, if management identifies additional material weaknesses in the future, or if we otherwise fail to maintain effective internal controls over financial reporting, we may not be able to accurately or timely report our financial position or results of operations, which may adversely affect our business and stock price or cause our access to the capital markets to be impaired.
Our disclosure controls and procedures are designed to provide reasonable assurance that the control system’s objectives will be met. Our management, including our Chief Executive Officer and Chief Financial Officer, after evaluating the effectiveness of our disclosure controls and procedures, has concluded that our disclosure controls and procedures were not effective as of June 30, 2025, due to a material weakness with respect to a small number of individuals dealing with general controls over information technology.
We are committed to remediating the material weakness identified in internal controls over financial reporting and have begun the process to remediate this material weakness. Our efforts will focus on instituting mitigating controls to address segregation of duties; hiring of additional staff; implementing additional controls to address system access deficiencies; implementing additional controls over business operations; establishing independent review and verification procedures for our vendor and customer master files; enhancing the documentation to support review occurrences and approval procedures; and, commencing regular periodic reviews of our internal controls over financial reporting with our Board of Directors and Audit Committee to address the inadequate risk oversight function and institute procedures to evaluate and report on risks to financial reporting, including the documentation and completion of a comprehensive risk assessment to identify all potential risk areas and evaluate the adequacy of our controls to mitigate these risks.
In addition, on March 11, 2025, we filed a Current Report on Form 8-K to report, among other things, certain changes in the level of compensation for Mr. Panora, our President and COO, and the resignation of Mr. Gehret, our Vice President of Operations. Although Mr. Gehret remained with us as an employee until February 28, 2025, and then as a consultant until his duties were transferred to Mr. Panora, we subsequently determined we did not report Mr. Gehret’s resignation timely in accordance with the requirements of Form 8-K.
Any failure to implement effective internal controls could harm our operating results or cause us to fail to meet our reporting obligations. Inadequate internal controls could also cause investors to lose confidence in our reported financial information, which could have a negative effect on the trading price of our common stock and may require us to incur additional costs to improve our internal control system.
If we identify further deficiencies in our internal control over financial reporting in the future or if we are unable to comply with the demands that will be placed upon us as a public company, including the requirements of Section 404 of the
38


TECOGEN INC.
Sarbanes-Oxley Act, in a timely manner, we may be unable to accurately report our financial results, or report them within the timeframes required by the SEC. We also could become subject to sanctions or investigations by the SEC or other regulatory authorities. In addition, if we are unable to assert that our internal control over financial reporting is effective, investors may lose confidence in the accuracy and completeness of our financial reports, we may face restricted access to the capital markets, and our stock price may be adversely affected.
Our current controls and any new controls that we develop may also become inadequate because of changes in our business, and weaknesses in our disclosure controls and internal control over financial reporting may be discovered in the future. Any failure to develop or maintain effective controls or any difficulties encountered in their implementation or improvement could cause us to fail to meet our reporting obligations, result in a restatement of our financial statements for prior periods, undermine investor confidence in us, and adversely affect the trading price of our common stock.
Item 2. Unregistered Sales of Equity Securities and Use of Proceeds

None.

Item 3. Defaults in Senior Securities

None.

Item 4. Mine Safety Disclosures

Not applicable.

Item 5. Other Information    

Securities Trading Plans of Directors and Executive Officers
During the six months ended June 30, 2025, none of the Company’s directors or officers, as defined in Section 16 of the Securities Exchange Act, adopted or terminated any contract, instruction or written plan for the purchase or sale of Company securities that was intended to satisfy the affirmative defense conditions of Rule 10b5-1(c) or any “non-Rule 10b5-1 trading arrangement” as defined under Item 408(a) of Regulation S-K.
39


TECOGEN INC.
Item 6. Exhibits
Exhibit No.Description of Exhibit
31.1*
Certification of Chief Executive Officer Pursuant to Rule 13a-14(a), as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002
31.2*
Certification of Chief Financial Officer Pursuant to Rule 13a-14(a), as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002
32.1*
Certification of Chief Executive Officer Pursuant to 18 U.S.C. 1350, as adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002
32.2*
Certification of Chief Financial Officer Pursuant to 18 U.S.C. 1350, as adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002
101.INS**XBRL Instance Document
101.SCH**XBRL Taxonomy Extension Schema
100.CAL**XBRL Taxonomy Extension Calculation Linkbase
100.DEF**XBRL Taxonomy Extension Definition Linkbase
101.LAB**XBRL Taxonomy Extension Label Linkbase
101.PRE** XBRL Taxonomy Extension Presentation Linkbase
____________________________________________
*    Filed herewith
**    Furnished herewith
+    Compensatory plan or arrangement





40


TECOGEN INC.

SIGNATURES
 
Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned.
 TECOGEN INC.
 (Registrant)
 
Dated: August 13, 2025By:/s/ Abinand Rangesh
Abinand Rangesh
Chief Executive Officer
(Principal Executive Officer)
Dated: August 13, 2025By:/s/ Roger P. Deschenes
Roger P. Deschenes
Chief Financial Officer and Chief Accounting Officer
(Principal Financial Officer and Principal Accounting Officer)

41

FAQ

What were Tecogen's total revenues for the six months ended June 30, 2025 (TGEN)?

Tecogen reported $14.57 million in total revenues for the six months ended June 30, 2025, up from $10.91 million a year earlier.

What was Tecogen's net loss and loss per share for the six months ended June 30, 2025?

Consolidated net loss was $2.13 million for the six months, with loss attributable to Tecogen of $2.12 million and basic loss per share of $0.08.

How much cash did Tecogen have at June 30, 2025 and how much cash was used in operations?

Cash and cash equivalents were $1.64 million at June 30, 2025, and net cash used in operating activities was $3.78 million for the six months.

What is the size and nature of the contingent consideration related to the Aegis acquisition?

Acquisition contingent consideration and related acquisition liabilities aggregated to approximately $1.25 million fair value as of June 30, 2025 and are remeasured periodically.

Did Tecogen take any material financing actions after June 30, 2025?

Yes. Tecogen completed a public offering that sold 3,985,000 shares at $5.00 per share and expects net proceeds of approximately $18.16 million.
Tecogen

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278.72M
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Electrical Equipment & Parts
Air-cond & Warm Air Heatg Equip & Comm & Indl Refrig Equip
United States
NORTH BILLERICA