Quarterly report pursuant to Section 13 or 15(d)

Commitments and contingencies

Commitments and contingencies
3 Months Ended
Mar. 31, 2022
Commitments and Contingencies Disclosure [Abstract]  
Commitments and contingencies Commitments and Contingencies     We guaranteed certain obligations of a former subsidiary of ADGE, EuroSite Power Inc. These guarantees include a payment performance guarantee in respect of collateralized equipment financing loans, with a remaining principal amount outstanding subject to the guarantee. In October 2021, the loan was paid in full. We have no further obligation to Eurosite Power Inc. under this guarantee.