v3.26.1
Reportable Segments and Geographic Information - Revenue by Major Customer by Reporting Segment (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Revenue, Major Customer [Line Items]    
Total revenues $ 348,975 $ 299,972
Revenue from contracts with customers 326,717 290,856
Revenue from lease arrangements 22,258 9,116
Customer A    
Revenue, Major Customer [Line Items]    
Total revenues $ 117,339 $ 111,459
Customer A | Customer Concentration Risk | Revenue Benchmark    
Revenue, Major Customer [Line Items]    
Concentration risk, percentage 33.70% 37.10%
RNG Fuel Supply    
Revenue, Major Customer [Line Items]    
Total revenues [1] $ 101,656 $ 88,420
RNG Fuel Supply | Customer A    
Revenue, Major Customer [Line Items]    
Total revenues $ 67,643 $ 68,416
RNG Fuel Supply | Customer A | Customer Concentration Risk | Revenue Benchmark    
Revenue, Major Customer [Line Items]    
Concentration risk, percentage 19.40% 22.80%
Fuel Station services    
Revenue, Major Customer [Line Items]    
Total revenues [2] $ 214,551 $ 166,875
Fuel Station services | Customer A    
Revenue, Major Customer [Line Items]    
Total revenues $ 42,874 $ 36,131
Fuel Station services | Customer A | Customer Concentration Risk | Revenue Benchmark    
Revenue, Major Customer [Line Items]    
Concentration risk, percentage 12.30% 12.00%
Fuel Station services | Customer B    
Revenue, Major Customer [Line Items]    
Total revenues $ 0 $ 42,028
Fuel Station services | Customer B | Customer Concentration Risk | Revenue Benchmark    
Revenue, Major Customer [Line Items]    
Concentration risk, percentage 0.00% 14.00%
Renewable Power    
Revenue, Major Customer [Line Items]    
Total revenues [3] $ 32,768 $ 44,677
Renewable Power | Customer A    
Revenue, Major Customer [Line Items]    
Total revenues $ 6,822 $ 6,912
Renewable Power | Customer A | Customer Concentration Risk | Revenue Benchmark    
Revenue, Major Customer [Line Items]    
Concentration risk, percentage 2.00% 2.30%
Brown gas sales | RNG Fuel Supply    
Revenue, Major Customer [Line Items]    
Total revenues $ 13,652 $ 4,745
Environmental attributes | RNG Fuel Supply    
Revenue, Major Customer [Line Items]    
Total revenues 86,315 82,317
Environmental attributes | Fuel Station services    
Revenue, Major Customer [Line Items]    
Total revenues 51,305 41,726
Environmental attributes | Renewable Power    
Revenue, Major Customer [Line Items]    
Total revenues 6,467 17,484
Environmental attributes | Renewable Power | OCI Fuels B.V. ("OCI")    
Revenue, Major Customer [Line Items]    
Total revenues 0 16,286
Other | RNG Fuel Supply    
Revenue, Major Customer [Line Items]    
Total revenues 1,689 1,358
Other | Renewable Power    
Revenue, Major Customer [Line Items]    
Total revenues 195 401
OPAL owned stations | Fuel Station services    
Revenue, Major Customer [Line Items]    
Total revenues 20,957 17,659
RNG marketing | Fuel Station services    
Revenue, Major Customer [Line Items]    
Total revenues 43,947 34,593
Third party station service and maintenance | Fuel Station services    
Revenue, Major Customer [Line Items]    
Total revenues 27,976 24,984
Construction | Fuel Station services    
Revenue, Major Customer [Line Items]    
Total revenues 49,040 39,767
Lease Revenues | Fuel Station services    
Revenue, Major Customer [Line Items]    
Total revenues 21,326 8,146
Lease Revenues | Fuel Station services | OCI Fuels B.V. ("OCI")    
Revenue, Major Customer [Line Items]    
Total revenues 7,734 0
Lease Revenues | Renewable Power    
Revenue, Major Customer [Line Items]    
Total revenues 932 970
Electricity sales | Renewable Power    
Revenue, Major Customer [Line Items]    
Total revenues 21,960 22,713
Capacity | Renewable Power    
Revenue, Major Customer [Line Items]    
Total revenues $ 3,214 $ 3,109
[1] Includes revenues from related parties of $68,039 and $68,416 for the years ended December 31, 2025 and 2024, respectively
[2] Includes revenues from related parties of $51,679 and $45,808 for the years ended December 31, 2025 and 2024, respectively
[3] Includes revenues from related parties of $6,822 and $6,912 for the years ended December 31, 2025 and 2024, respectively