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Revenue from Contracts with Customers
 12 Months Ended
Dec. 31, 2022
Revenue from Contract with Customer [Abstract]  
Revenue from Contracts with Customers REVENUE FROM CONTRACTS WITH CUSTOMERS
Disaggregation of Revenue
Our reportable segments for the year ended December 31, 2022 were U.S. Regions, U.S. Federal, Canada, Alternative Fuels (formerly Non-Solar Distributed Generation (“Non-Solar DG”)), and All Other. On January 1, 2022, we changed the structure of our internal organization, and our “All Other” segment now includes our U.S.-based enterprise energy management services previously included in our U.S Regions segment and our U.S. Regions segment now includes U.S. project revenue and associated costs previously included in our former Non-Solar DG segment. As a result, previously reported amounts have been reclassified for comparative purposes.
The following table presents our revenue disaggregated by line of business and reportable segment for the year ended December 31, 2022:
US RegionsU.S. FederalCanadaAlternative FuelsAll OtherTotal
Project revenue$1,049,465 $333,846 $44,273 $— $53,680 $1,481,264 
O&M revenue22,217 51,857 42 10,377 472 84,965 
Energy assets47,372 5,822 4,447 104,082 368 162,091 
Integrated-PV— — — — 49,696 49,696 
Other4,289 366 9,796 — 31,955 46,406 
Total revenues$1,123,343 $391,891 $58,558 $114,459 $136,171 $1,824,422 
The following table presents our revenue disaggregated by line of business and reportable segment for the year ended December 31, 2021:
US RegionsU.S. FederalCanadaAlternative FuelsAll OtherTotal
Project revenue$488,507 $340,686 $36,776 $— $37,991 $903,960 
O&M revenue21,551 47,072 71 9,288 631 78,613 
Energy assets39,433 4,913 4,532 101,811 562 151,251 
Integrated-PV— — — — 41,202 41,202 
Other1,627 277 8,104 124 30,539 40,671 
Total revenues$551,118 $392,948 $49,483 $111,223 $110,925 $1,215,697 
The following table presents our revenue disaggregated by line of business and reportable segment for the year ended December 31, 2020:
US RegionsU.S. FederalCanadaAlternative FuelsAll OtherTotal
Project revenue$369,341 $327,626 $36,689 $— $30,950 $764,606 
O&M revenue18,633 45,423 169 7,848 289 72,362 
Energy assets33,792 4,358 4,069 75,168 810 118,197 
Integrated-PV— — — — 39,112 39,112 
Other1,888 475 6,830 612 28,193 37,998 
Total revenues$423,654 $377,882 $47,757 $83,628 $99,354 $1,032,275 
See Note 16 for our revenue disaggregated by geographical region.
The following table presents information related to our revenue recognized over time:
Year Ended December 31,
202220212020
Percentage of revenue recognized over time96 %95 %94 %
The remainder of our revenue is for products and services transferred at a point in time, at which point revenue is recognized.
Contract Balances
The following table provides information about receivables, contract assets, and contract liabilities from contracts with customers:
 December 31, 2022December 31, 2021
Accounts receivable, net$174,009 $161,970 
Accounts receivable retainage38,057 43,067 
Contract Assets
Costs and estimated earnings in excess of billings576,363  306,172 
Contract Liabilities
Billings in excess of cost and estimated earnings34,796 35,918 
Billings in excess of cost and estimated earnings, non-current (1)
7,617 6,481 
Total contract liabilities$42,413 $42,399 
(1) Performance obligations that are expected to be completed beyond the next twelve months and are included in other liabilities in the consolidated balance sheets.
The increase in contract assets for the year ended December 31, 2022 was primarily due to revenue recognized of $1,371,455, offset in part by billings of $1,103,926. Contract assets also increased due to reclassifications, primarily from contract liabilities as a result of timing of customer payments. The increase in contract liabilities was primarily driven by the receipt of advance payments from customers, and related billings, as well as reclassifications from contract assets as a result of timing of customer payments. The advance payments and reclassifications exceeded the recognition of revenue as performance obligations were satisfied. For the year ended December 31, 2022, we recognized revenue of $135,506 and billed $129,749 to customers that had balances which were included in contract liabilities at December 31, 2021.
The increase in contract assets for the year ended December 31, 2021 was primarily due to revenue recognized of $708,384, offset in part by billings of $618,041. The increase in contract liabilities was primarily driven by the receipt of advance payments from customers, and related billings, exceeding recognition of revenue as performance obligations were satisfied. For the year ended December 31, 2021, we recognized revenue of $207,746, and billed customers $181,284 to customers that had balances which were included in contract liabilities at December 31, 2020.
Backlog
Our remaining performance obligations (“fully-contracted backlog”) represent the unrecognized revenue value of our contract commitments. Our backlog may vary significantly each reporting period based on the timing of major new contract commitments and the fully-contracted backlog may fluctuate with currency movements. In addition, our customers have the right, under some circumstances, to terminate contracts or defer the timing of our services and their payments to us. At December 31, 2022, we had fully-contracted backlog of $2,232,445 and approximately 31% of our fully-contracted backlog is anticipated to be recognized as revenue in the next twelve months. The remaining performance obligations primarily relate to the energy efficiency and renewable energy construction projects, including long-term O&M services related to these projects. The long-term services have varying initial contract terms, up to 25 years.
We applied the practical expedient for certain revenue streams to exclude the value of remaining performance obligations for (i) contracts with an original expected term of one year or less or (ii) contracts for which we recognize revenue in proportion to the amount we have the right to invoice for services performed.
Contract Acquisition Costs
As of December 31, 2022 and 2021, we had capitalized commission costs of $1,735, related to contracts that were not completed, which were included in other assets in the accompanying consolidated balance sheets. For contracts that have a duration of less than one year, we follow a practical expedient and expense these costs when incurred. During the years ended December 31, 2022 and 2021, the amortization of commission costs related to contracts was not material and have been included in the accompanying consolidated statements of income.
The following table presents information related to our project development costs recognized in the consolidated statements of income on projects that converted to customer contracts:
Year Ended December 31,
202220212020
Project development costs recognized$15,507 $12,737 $12,790 
No impairment charges in connection with our commission costs or project development costs were recorded during the years ended December 31, 2022, 2021 and 2020.