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Revenue from Contracts with Customers
 6 Months Ended
Jun. 30, 2023
Revenue from Contract with Customer [Abstract]  
Revenue from Contracts with Customers REVENUE FROM CONTRACTS WITH CUSTOMERS
Disaggregation of Revenue
Our reportable segments for the three and six months ended June 30, 2023 and 2022 were U.S. Regions, U.S. Federal, Canada, Alternative Fuels and All Other.
The following table presents our revenue disaggregated by line of business and reportable segment for the three months ended June 30, 2023:
U.S. RegionsU.S. FederalCanadaAlternative FuelsAll OtherTotal
Project revenue$113,502 $63,904 $11,082 $— $40,399 $228,887 
O&M revenue6,309 13,901 53 2,295 460 23,018 
Energy assets18,057 2,164 1,334 28,021 430 50,006 
Integrated-PV— — — — 11,486 11,486 
Other1,117 50 2,726 — 9,784 13,677 
Total revenues$138,985 $80,019 $15,195 $30,316 $62,559 $327,074 
The following table presents our revenue disaggregated by line of business and reportable segment for the three months ended June 30, 2022:
U.S. RegionsU.S. FederalCanadaAlternative FuelsAll OtherTotal
Project revenue$378,646 $85,850 $10,160 $— $14,464 $489,120 
O&M revenue5,457 13,365 11 2,122 95 21,050 
Energy assets12,253 2,074 1,487 27,070 39 42,923 
Integrated-PV— — — — 12,267 12,267 
Other1,029 139 2,803 — 8,066 12,037 
Total revenues$397,385 $101,428 $14,461 $29,192 $34,931 $577,397 

The following table presents our revenue disaggregated by line of business and reportable segment for the six months ended June 30, 2023:
U.S. RegionsU.S. FederalCanadaAlternative FuelsAll OtherTotal
Project revenue$217,822 $109,453 $25,993 $— $58,849 $412,117 
O&M revenue11,838 26,601 63 5,981 793 45,276 
Energy assets31,708 3,240 2,096 52,674 1,060 90,778 
Integrated-PV— — — — 23,430 23,430 
Other1,986 281 5,454 — 18,794 26,515 
Total revenues$263,354 $139,575 $33,606 $58,655 $102,926 $598,116 
The following table presents our revenue disaggregated by line of business and reportable segment for the six months ended June 30, 2022:
U.S. RegionsU.S. FederalCanadaAlternative FuelsAll OtherTotal
Project revenue$677,278 $148,067 $24,111 $— $33,068 $882,524 
O&M revenue10,537 25,662 22 4,896 186 41,303 
Energy assets22,271 3,164 2,248 53,557 111 81,351 
Integrated-PV— — — — 23,623 23,623 
Other1,819 181 5,252 — 15,346 22,598 
Total revenues$711,905 $177,074 $31,633 $58,453 $72,334 $1,051,399 

The following table presents information related to our revenue recognized over time:
Three Months Ended June 30,Six Months Ended June 30,
2023202220232022
Percentage of revenue recognized over time95%97%94%97%
The remainder of our revenue is for products and services transferred at a point in time, at which point revenue is recognized.
We attribute revenues to customers based on the location of the customer. The following table presents information related to our revenues by geographic area:
Three Months Ended June 30,Six Months Ended June 30,
2023202220232022
United States$270,957 $548,880 $504,041 $987,271 
Canada13,566 13,025 30,800 29,013 
Other42,551 15,492 63,275 35,115 
Total revenues$327,074 $577,397 $598,116 $1,051,399 

Contract Balances
The following tables provide information about receivables, contract assets and contract liabilities from contracts with customers:
 June 30, 2023December 31, 2022
Accounts receivable, net$123,361 $174,009 
Accounts receivable retainage, net$37,803 $38,057 
Contract Assets:
Costs and estimated earnings in excess of billings $575,113 $576,363 
Contract Liabilities:
Billings in excess of cost and estimated earnings$40,459 $34,796 
Billings in excess of cost and estimated earnings, non-current (1)
15,659 7,617 
Total contract liabilities$56,118 $42,413 
June 30, 2022December 31, 2021
Accounts receivable, net$207,990 $161,970 
Accounts receivable retainage, net$43,444 $43,067 
Contract Assets:
Costs and estimated earnings in excess of billings$663,798 $306,172 
Contract Liabilities:
Billings in excess of cost and estimated earnings$39,787 $35,918 
Billings in excess of cost and estimated earnings, non-current (1)
$6,175 $6,481 
Total contract liabilities$45,962 $42,399 
(1) Performance obligations that are expected to be completed beyond the next twelve months and are included in other liabilities in the condensed consolidated balance sheets.
The decrease in contract assets for the six months ended June 30, 2023 was primarily due to billings of $436,030 offset by revenue recognized of $413,181. Contract assets are also affected by 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 six months ended June 30, 2023, we recognized revenue of $73,585 and billed $80,774 to customers that had balances which were included in contract liabilities at December 31, 2022.
The increase in contract assets for the six months ended June 30, 2022 was primarily due to revenue recognized of $845,211 offset by billings of $492,820. 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. In addition, the advance payments and reclassifications exceeded the recognition of revenue as performance obligations were
satisfied. For the six months ended June 30, 2022, we billed customers $59,453 and recognized revenue of $64,145 that was previously included in the beginning balance of contract liabilities.
Performance Obligations
Our remaining performance obligations (“backlog”) represent the unrecognized revenue value of our contract commitments. At June 30, 2023, we had contracted backlog of $2,328,660 of which approximately 36% 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 operations and maintenance (“O&M”) services related to these projects. The long-term services have varying initial contract terms, up to 25 years.
Project Development Costs
Project development costs of $3,605 and $1,771 were recognized in the condensed consolidated statements of income on projects that converted to customer contracts during the three months ended June 30, 2023 and 2022, respectively. Project development costs of $6,217 and $5,980 were recognized in the condensed consolidated statements of income on projects that converted to customer contracts during the six months ended June 30, 2023 and 2022, respectively.
No impairment charges in connection with our project development costs were recorded during the three or six months ended June 30, 2023 and 2022.