Sale of Energy Producing Assets	9 Months Ended
Sale of Energy Producing Assets	Sep. 30, 2025
Discontinued Operations and Disposal Groups [Abstract]
Sale of Energy Producing Assets	Sale of Energy Producing AssetsDuring 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 September 30, 2025, we do not expect to make any material payments under the guarantee. At June 30, 2025, our obligation under the energy production contracts was $42,089, representing 100% of the cash flows shortfall below the minimum threshold for the bi-annual period ended June 30, 2025. Payment was made in the third quarter of 2025 and our obligation as of September 30, 2025 was $0. 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. If we are 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.

TECOGEN INC. 10-Q