Quarterly report pursuant to Section 13 or 15(d)


9 Months Ended
Sep. 30, 2021
Revenue from Contract with Customer [Abstract]  
NOTE 5 – Revenues
Revenue by Product Type
The following table disaggregates revenue by significant product type for the periods indicated:
(in thousands)
Three Months Ended September 30, Nine Months Ended September 30,
2021 2020 2021 2020
RNG, including RINs and LCFSs
$ 5,525  $ —  $ 6,346  $ — 
Gas O&M service
110  —  110  — 
Power, including RECs
5,125  —  7,363  — 
Electric O&M service
156  —  156  — 
Equipment and associated services
865  1,904  4,588  4,496 
$ 11,781  $ 1,904  $ 18,563  $ 4,496 
Contract Assets and Contract Liabilities
The timing of revenue recognition may differ from the timing of invoicing to customers. Contract assets include unbilled amounts from projects when revenues recognized under the cost-to-cost measure of progress exceed the amounts invoiced to customers, as the amounts cannot be billed under the terms of the contracts. Contract liabilities from contracts arise when amounts invoiced to customers exceed revenues recognized under the cost-to-cost measure of progress. Contract liabilities additionally include advanced payments from customers on certain contracts. Contract liabilities decrease as revenue is recognized from the satisfaction of the related performance obligation and are recorded as either current or long-term, depending upon when such revenue is expected to be recognized.
Contract assets and liabilities consisted of the following as of September 30, 2021 and December 31, 2020:
(in thousands) September 30,
December 31,
Contract assets (included in Prepaid expenses and other current assets)
$ 104  $ 48 
Contract liabilities (included in Accrued and other current liabilities)
$ (520) $ (1,423)
Transaction Price Allocated to Remaining Unsatisfied Performance Obligations
Remaining performance obligations at September 30, 2021 were approximately $2.3 million.
Projects are included within remaining performance obligations at such time the project is awarded and agreement on contract terms has been reached. Remaining performance obligations include amounts related to contracts for which a fixed price contract value is not assigned only when a reasonable estimate of total transaction price can be made. Remaining performance obligations include unrecognized revenues to be realized from uncompleted contracts and firm sales contracts with original terms in excess of one year.