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Commitments and Contingencies - Summary of Commitments Contractual Obligation Maturities (Details)
$ in Thousands
Dec. 31, 2023
USD ($)
OTP  
Land Easement Payments  
2024 $ 1,804
2025 1,840
2026 1,845
2027 1,882
2028 1,921
Beyond 2028 53,107
Land easement payments, total 62,399
Construction Program and Other Commitments | Subsidiaries  
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract]  
2024 4,374
2025 4,051
2026 1,377
2027 594
2028 550
Beyond 2028 6,165
Commitments other than operating leases, total 17,111
Capacity and Energy Requirements | OTP  
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract]  
2024 245
2025 217
2026 197
2027 197
2028 197
Beyond 2028 3,939
Commitments other than operating leases, total 4,992
Coal Purchase Commitments | OTP  
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract]  
2024 24,691
2025 24,593
2026 25,374
2027 25,786
2028 25,344
Beyond 2028 359,610
Commitments other than operating leases, total $ 485,398