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Commitments and Contingencies - Summary of Commitments (Details)
$ in Thousands
Jun. 30, 2023
USD ($)
Other Commitments [Line Items]  
2023 (remaining) $ 5,580
2024 3,665
2025 8,837
2026 2,145
2027 2,498
2028 and thereafter 34,709
Purchase Obligation, Total 57,434
Fuel Supply Payments  
Other Commitments [Line Items]  
2023 (remaining) 2,287
2024 2,408
2025 1,702
2026 1,718
2027 2,060
2028 and thereafter 28,263
Purchase Obligation, Total 38,438
Zero6 Commitment  
Other Commitments [Line Items]  
2023 (remaining) 195
2024 295
2025 6,720
2026 0
2027 0
2028 and thereafter 0
Purchase Obligation, Total 7,210
PRAJ Commitment  
Other Commitments [Line Items]  
2023 (remaining) 2,900
2024 558
2025 0
2026 0
2027 0
2028 and thereafter 0
Purchase Obligation, Total 3,458
Renewable Energy Credits  
Other Commitments [Line Items]  
2023 (remaining) 74
2024 148
2025 148
2026 148
2027 148
2028 and thereafter 1,828
Purchase Obligation, Total 2,494
Electricity Above Use (Est.)  
Other Commitments [Line Items]  
2023 (remaining) 124
2024 256
2025 267
2026 279
2027 290
2028 and thereafter 4,618
Purchase Obligation, Total $ 5,834