v3.26.1
REPORTABLE SEGMENTS AND GEOGRAPHIC INFORMATION - Revenue by Major Customer by Reporting Segment (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Customer, Extent of Reliance [Line Items]        
Total revenues $ 83,399 $ 80,456 $ 156,774 $ 165,863
Revenue from contracts with customers 79,695 77,446 147,111 160,412
Revenue from lease arrangements 3,704 3,010 9,663 5,451
Customer A        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Customer, Extent of Reliance [Line Items]        
Total revenues $ 37,896 $ 29,696 $ 66,541 $ 65,942
Customer A | Customer Concentration Risk | Revenue Benchmark        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Customer, Extent of Reliance [Line Items]        
Concentration risk, percentage 45.00% 37.00% 43.00% 39.00%
RNG fuel        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Customer, Extent of Reliance [Line Items]        
Total revenues [1],[2] $ 23,821 $ 25,130 $ 45,459 $ 52,729
RNG fuel | Customer A        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Customer, Extent of Reliance [Line Items]        
Total revenues $ 18,538 $ 17,732 $ 35,455 $ 37,833
RNG fuel | Customer A | Customer Concentration Risk | Revenue Benchmark        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Customer, Extent of Reliance [Line Items]        
Concentration risk, percentage 22.00% 22.00% 23.00% 23.00%
Fuel Station Services        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Customer, Extent of Reliance [Line Items]        
Total revenues [3],[4] $ 53,064 $ 47,026 $ 97,630 $ 97,704
Fuel Station Services | Customer A        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Customer, Extent of Reliance [Line Items]        
Total revenues $ 18,540 $ 10,476 $ 29,396 $ 25,455
Fuel Station Services | Customer A | Customer Concentration Risk | Revenue Benchmark        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Customer, Extent of Reliance [Line Items]        
Concentration risk, percentage 22.00% 13.00% 19.00% 15.00%
Renewable Power        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Customer, Extent of Reliance [Line Items]        
Total revenues [5],[6] $ 6,514 $ 8,300 $ 13,685 $ 15,430
Renewable Power | Customer A        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Customer, Extent of Reliance [Line Items]        
Total revenues $ 818 $ 1,488 $ 1,690 $ 2,654
Renewable Power | Customer A | Customer Concentration Risk | Revenue Benchmark        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Customer, Extent of Reliance [Line Items]        
Concentration risk, percentage 1.00% 2.00% 1.00% 1.00%
Environmental attributes | RNG fuel        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Customer, Extent of Reliance [Line Items]        
Total revenues $ 20,424 $ 19,941 $ 38,654 $ 45,771
Environmental attributes | Renewable Power        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Customer, Extent of Reliance [Line Items]        
Total revenues 1,158 2,767 1,871 3,588
Brown gas sales and other | RNG fuel        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Customer, Extent of Reliance [Line Items]        
Total revenues 3,397 5,189 6,805 6,958
OPAL owned stations | Fuel Station Services        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Customer, Extent of Reliance [Line Items]        
Total revenues 5,102 5,916 11,053 10,822
Environmental Attributes And RNG MarketingEnvironmental attributes and RNG marketing | Fuel Station Services        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Customer, Extent of Reliance [Line Items]        
Total revenues 30,994 22,774 52,183 51,300
Third party station service and maintenance | Fuel Station Services        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Customer, Extent of Reliance [Line Items]        
Total revenues 7,125 6,534 13,925 13,604
Construction | Fuel Station Services        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Customer, Extent of Reliance [Line Items]        
Total revenues 6,329 9,183 11,228 17,174
Lease revenues | Fuel Station Services        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Customer, Extent of Reliance [Line Items]        
Total revenues 3,514 2,619 9,241 4,804
Lease revenues | Fuel Station Services | OCI Fuels B.V. ("OCI")        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Customer, Extent of Reliance [Line Items]        
Total revenues 0 0 2,246 0
Lease revenues | Renewable Power        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Customer, Extent of Reliance [Line Items]        
Total revenues 190 391 422 647
Electricity sales | Renewable Power        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Customer, Extent of Reliance [Line Items]        
Total revenues 4,915 4,324 10,707 9,580
Other | Renewable Power        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Customer, Extent of Reliance [Line Items]        
Total revenues $ 251 $ 818 $ 685 $ 1,615
[1]
Includes revenues from related parties of $17,167 and $37,979 for the six months ended June 30, 2026 and 2025, respectively.
[2] Includes revenues from related parties of $125 and $17,878 for the three months ended June 30, 2026 and 2025, respectively.
[3]
Includes revenues from related parties of $16,358 and $29,429 for the six months ended June 30, 2026 and 2025, respectively.
[4] Includes revenues from related parties of $3,251 and $12,826 for the three months ended June 30, 2026 and 2025, respectively
[5]
Includes revenues from related parties of $872 and $2,654 for the six months ended June 30, 2026 and 2025, respectively.
[6] Includes revenues from related parties of $0 and $1,488 for the three months ended June 30, 2026 and 2025, respectively.