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Commitments and Contingencies (Details)
1 Months Ended 12 Months Ended
Feb. 07, 2023
USD ($)
Nov. 30, 2022
MW
Mar. 31, 2021
MW
Dec. 31, 2022
USD ($)
MWh
Contracts
MW
Dec. 31, 2021
USD ($)
MWh
Dec. 31, 2020
USD ($)
MWh
Long-term Purchase Commitment [Line Items]            
Long-term Line of Credit, Noncurrent       $ 34,300,000 $ 33,300,000  
Average cost of Company's energy output (US$ per kWh)       $ 0.034    
Number of Public Utility Districts with long term purchase agreements | Contracts       3    
Contract expenses       $ 149,575,000 $ 117,812,000 $ 116,874,000
Long-term Contract for Purchase of Electric Power, Share of Plant Output Being Purchased       16.40%    
Long-term Contract for Purchase of Electric Power, Capacity | MW       956    
Long-term Contract for Purchase of Electric Power, Estimated Annual Cost       $ 203,889,000    
Long-term Contract for Purchase of Electric Power, Annual Minimum Debt Service Payment Required       18,605,000    
Long-term Contract for Purchase of Electric Power, Interest Included in Contract Charges       7,791,000    
Long-term Contract for Purchase of Electric Power, Amount of Long-term Debt or Lease Obligation Outstanding       146,786,000    
Payment Obligations for Power Purchases            
2023       986,455,000    
2024       679,513,000    
2025       497,760,000    
2026       292,371,000    
2027       257,055,000    
Thereafter       2,171,578,000    
Total       $ 4,884,732,000    
Total energy obtained during period under purchased power contracts (MWh) | MWh       15.3 13.1 13.2
Cost incurred during period to provide energy under purchased power contracts       $ 892,700,000 $ 631,400,000 $ 491,700,000
Daily take obligation under long-term service contract (percent)       100.00%    
Daily delivery obligation under long-term service contract (percent)       100.00%    
Natural Gas [Member]            
Payment Obligations for Power Purchases            
2023       $ 1,013,547,000    
2024       377,588,000    
2025       351,129,000    
2026       255,577,000    
2027       76,453,000    
Thereafter       0    
Total       2,074,294,000    
Colombia River Projects [Member]            
Payment Obligations for Power Purchases            
2023       191,618,000    
2024       145,078,000    
2025       140,887,000    
2026       138,482,000    
2027       123,152,000    
Thereafter       394,875,000    
Non-Utility Generators [Member]            
Payment Obligations for Power Purchases            
Total       586,138,000    
Firm Transportation Service [Member]            
Payment Obligations for Power Purchases            
2023       175,136,000    
2024       146,675,000    
2025       112,327,000    
2026       94,417,000    
2027       94,123,000    
Thereafter       570,687,000    
Total       1,193,365,000    
Firm Storage and Peaking Service [Member]            
Payment Obligations for Power Purchases            
2023       9,350,000    
2024       7,923,000    
2025       7,448,000    
2026       7,432,000    
2027       7,352,000    
Thereafter       1,838,000    
Total       41,343,000    
Long-term Purchase Commitment, Demand Charges       138,300,000 136,400,000 135,800,000
Combustion turbines            
Payment Obligations for Power Purchases            
Long-term Purchase Commitment, Demand Charges       53,900,000 $ 52,800,000 $ 51,200,000
Energy production service contracts            
Payment Obligations for Power Purchases            
2023       33,971,000    
2024       34,812,000    
2025       35,772,000    
2026       18,728,000    
2027       19,221,000    
Thereafter       79,655,000    
Total       222,159,000    
Automated meter reading system            
Payment Obligations for Power Purchases            
2023       50,124,000    
2024       47,301,000    
2025       47,668,000    
2026       48,803,000    
2027       0    
Thereafter       0    
Total       193,896,000    
Service contract obligations            
Payment Obligations for Power Purchases            
2023       84,095,000    
2024       82,113,000    
2025       83,440,000    
2026       67,531,000    
2027       19,221,000    
Thereafter       79,655,000    
Total       416,055,000    
Service contract obligations | Subsequent Event [Member]            
Payment Obligations for Power Purchases            
Total $ 3,100,000,000          
Colombia River Projects [Member]            
Payment Obligations for Power Purchases            
Total       1,134,092,000    
Other Utilities [Member]            
Payment Obligations for Power Purchases            
Total       3,164,502,000    
Electric Portfolio            
Payment Obligations for Power Purchases            
2023       380,559,000    
2024       385,807,000    
2025       345,257,000    
2026       142,273,000    
2027       133,903,000    
Thereafter       1,776,703,000    
Firm natural gas supply            
Payment Obligations for Power Purchases            
2023       1,198,033,000    
2024       532,186,000    
2025       470,904,000    
2026       357,426,000    
2027       177,928,000    
Thereafter       572,525,000    
Total       $ 3,309,002,000    
Minimum | Combustion turbines            
Payment Obligations for Power Purchases            
Remaining terms under contract       1 year    
Maximum | Combustion turbines            
Payment Obligations for Power Purchases            
Remaining terms under contract       22 years    
Rock Island Project            
Long-term Purchase Commitment [Line Items]            
Long-term Contract for Purchase of Electric Power, Share of Plant Output Being Purchased     5.00% 30.00%    
Long-term Contract for Purchase of Electric Power, Capacity | MW     31 187    
Long-term Contract for Purchase of Electric Power, Estimated Annual Cost       $ 47,892,000    
Long-term Contract for Purchase of Electric Power, Annual Minimum Debt Service Payment Required       12,072,000    
Long-term Contract for Purchase of Electric Power, Interest Included in Contract Charges       5,132,000    
Long-term Contract for Purchase of Electric Power, Amount of Long-term Debt or Lease Obligation Outstanding       $ 93,493,000    
Rock Island Project | Subsequent Event [Member]            
Long-term Purchase Commitment [Line Items]            
Long-term Contract for Purchase of Electric Power, Share of Plant Output Being Purchased 25.00%          
Rocky Reach Project            
Long-term Purchase Commitment [Line Items]            
Long-term Contract for Purchase of Electric Power, Share of Plant Output Being Purchased     5.00% 30.00%    
Long-term Contract for Purchase of Electric Power, Capacity | MW     65 390    
Long-term Contract for Purchase of Electric Power, Estimated Annual Cost       $ 54,022,000    
Long-term Contract for Purchase of Electric Power, Annual Minimum Debt Service Payment Required       5,039,000    
Long-term Contract for Purchase of Electric Power, Interest Included in Contract Charges       1,907,000    
Long-term Contract for Purchase of Electric Power, Amount of Long-term Debt or Lease Obligation Outstanding       $ 33,757,000    
Rocky Reach Project | Subsequent Event [Member]            
Long-term Purchase Commitment [Line Items]            
Long-term Contract for Purchase of Electric Power, Share of Plant Output Being Purchased 25.00%          
Wells Project [Member]            
Long-term Purchase Commitment [Line Items]            
Long-term Contract for Purchase of Electric Power, Share of Plant Output Being Purchased     5.50% 32.80%    
Long-term Contract for Purchase of Electric Power, Capacity | MW     46,000,000 276    
Long-term Contract for Purchase of Electric Power, Estimated Annual Cost       $ 45,489,000    
Long-term Contract for Purchase of Electric Power, Annual Minimum Debt Service Payment Required       0    
Long-term Contract for Purchase of Electric Power, Interest Included in Contract Charges       0    
Long-term Contract for Purchase of Electric Power, Amount of Long-term Debt or Lease Obligation Outstanding       $ 0    
Priest Rapids Development            
Long-term Purchase Commitment [Line Items]            
Long-term Contract for Purchase of Electric Power, Share of Plant Output Being Purchased       4.80%    
Long-term Contract for Purchase of Electric Power, Capacity | MW   39,000,000   45    
Long-term Contract for Purchase of Electric Power, Estimated Annual Cost       $ 28,243,000    
Long-term Contract for Purchase of Electric Power, Annual Minimum Debt Service Payment Required       747,000    
Long-term Contract for Purchase of Electric Power, Interest Included in Contract Charges       376,000    
Long-term Contract for Purchase of Electric Power, Amount of Long-term Debt or Lease Obligation Outstanding       $ 9,768,000    
Wanapum Development            
Long-term Purchase Commitment [Line Items]            
Long-term Contract for Purchase of Electric Power, Share of Plant Output Being Purchased       4.80%    
Long-term Contract for Purchase of Electric Power, Capacity | MW   51,000,000   58    
Long-term Contract for Purchase of Electric Power, Estimated Annual Cost       $ 28,243,000    
Long-term Contract for Purchase of Electric Power, Annual Minimum Debt Service Payment Required       747,000    
Long-term Contract for Purchase of Electric Power, Interest Included in Contract Charges       376,000    
Long-term Contract for Purchase of Electric Power, Amount of Long-term Debt or Lease Obligation Outstanding       9,768,000    
Priest Rapids Project            
Long-term Purchase Commitment [Line Items]            
Long-term Contract for Purchase of Electric Power, Share of Plant Output Being Purchased   4.13%        
Electricity, US Regulated [Member]            
Payment Obligations for Power Purchases            
2023       414,278,000    
2024       148,628,000    
2025       11,616,000    
2026       11,616,000    
2027       0    
Thereafter       $ 0