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Commitments and Contingencies - Summary of Commitments (Details)
$ in Thousands
Mar. 31, 2024
USD ($)
Other Commitments [Line Items]  
2024 $ 31,632
2025 16,458
2026 1,846
2027 2,188
2028 1,881
2029 and thereafter 27,428
Purchase Obligation, Total 81,433
Fuel Supply Payments  
Other Commitments [Line Items]  
2024 3,111
2025 1,702
2026 1,718
2027 2,060
2028 1,753
2029 and thereafter 25,979
Purchase Obligation, Total 36,323
Zero6 Commitment  
Other Commitments [Line Items]  
2024 28,045
2025 14,628
2026 0
2027 0
2028 0
2029 and thereafter 0
Purchase Obligation, Total 42,673
Renewable Energy Credits  
Other Commitments [Line Items]  
2024 96
2025 128
2026 128
2027 128
2028 128
2029 and thereafter 1,449
Purchase Obligation, Total 2,057
Electricity Above Use (Est.)  
Other Commitments [Line Items]  
2024 380
Purchase Obligation, Total $ 380