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Commitments and Contingencies - Schedule of Commitments Contractual Obligation Maturities (Details)
$ in Thousands
Dec. 31, 2021
USD ($)
OTP  
Unrecorded Unconditional Purchase Obligation [Line Items]  
2022 $ 1,364
2023 1,388
2024 1,412
2025 1,437
2026 1,432
Beyond 2026 27,461
Land easement payments, total 34,494
Construction Program and Other Commitments | Subsidiaries  
Unrecorded Unconditional Purchase Obligation [Line Items]  
2022 889
2023 14,678
2024 879
2025 886
2026 479
Beyond 2026 6,697
Commitments other than operating leases, total 24,508
Capacity and Energy Requirements | OTP  
Unrecorded Unconditional Purchase Obligation [Line Items]  
2022 20,390
2023 11,854
2024 11,828
2025 11,784
2026 11,753
Beyond 2026 109,003
Commitments other than operating leases, total 176,612
Coal Purchase Commitments | OTP  
Unrecorded Unconditional Purchase Obligation [Line Items]  
2022 22,793
2023 23,955
2024 23,955
2025 24,369
2026 25,103
Beyond 2026 428,304
Commitments other than operating leases, total $ 548,479