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Commitments and Contingencies - Schedule of Commitments Contractual Obligation Maturities (Details)
$ in Thousands
Dec. 31, 2022
USD ($)
OTP  
Unrecorded Unconditional Purchase Obligation [Line Items]  
2023 $ 1,388
2024 1,412
2025 1,437
2026 1,432
2027 1,457
Beyond 2027 26,004
Land easement payments, total 33,130
Construction Program and Other Commitments | Subsidiaries  
Unrecorded Unconditional Purchase Obligation [Line Items]  
2023 12,423
2024 934
2025 472
2026 479
2027 487
Beyond 2027 6,660
Commitments other than operating leases, total 21,455
Capacity and Energy Requirements | OTP  
Unrecorded Unconditional Purchase Obligation [Line Items]  
2023 298
2024 272
2025 228
2026 197
2027 197
Beyond 2027 3,939
Commitments other than operating leases, total 5,131
Coal Purchase Commitments | OTP  
Unrecorded Unconditional Purchase Obligation [Line Items]  
2023 23,955
2024 24,369
2025 25,103
2026 25,716
2027 25,804
Beyond 2027 402,500
Commitments other than operating leases, total $ 527,447