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CONSOLIDATED BALANCE SHEETS - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Utility Plant [Abstract]    
Public Utilities Property Plant And Equipment Electric Plant $ 9,458,901 $ 9,200,231
Public Utilities Property Plant And Equipment Gas Plant 4,371,055 4,227,532
Public Utilities Property Plant And Equipment Common Plant 1,092,878 1,116,524
Public Utilities, Property, Plant and Equipment, Accumulated Depreciation (3,852,938) (3,671,094)
Public Utilities, Property, Plant and Equipment, Net, Total 11,069,896 10,873,193
Other Property And Investments [Abstract]    
Goodwill 1,656,513 1,656,513
Other Property And Investments 325,162 324,184
Total Other Property And Investments 1,981,675 1,980,697
Assets, Current [Abstract]    
Cash and Cash Equivalents, at Carrying Value 531,056 52,307
Restricted Cash and Cash Equivalents, Current 13,819 29,544
Accounts Receivable, after Allowance for Credit Loss, Current 294,820 352,132
Unbilled Revenues 160,980 221,871
Other Inventory, Supplies, Gross 120,852 118,333
Fuel And Gas Inventory At Average Cost 63,620 48,795
Derivative Asset, Current 150,371 33,015
Prepaid Expense and Other Assets, Current 46,529 45,746
Power Contract Acquisition Adjustment Gain Current 16,864 14,874
Assets, Current, Total 1,398,911 916,617
Other Longterm And Regulatory Assets [Abstract]    
Power Cost Adjustment Mechanism Asset, Noncurrent 69,551 82,801
purchase gas adjustment, long-term 49,425 87,655
Regulatory Assets Related To Power Contracts 10,481 11,728
Other Regulatory Assets 768,459 747,651
Derivative Asset, Noncurrent 17,848 8,805
Power Contract Acquisition Adjustment Non Current 74,114 80,900
Operating Lease, Right-of-Use Asset 191,498 172,167
Other Assets, Noncurrent 93,426 80,751
Total Longterm And Regulatory Assets 1,274,802 1,272,458
Assets, Total 15,725,284 15,042,965
Capitalization [Abstract]    
Common stock 0 0
Additional Paid in Capital 3,523,532 3,313,532
Retained Earnings (Accumulated Deficit) 1,110,869 912,787
Accumulated Other Comprehensive Income (Loss), Net of Tax (81,666) (86,437)
Stockholders' Equity Attributable to Parent, Total 4,552,735 4,139,882
Long-term Debt, Excluding Current Maturities [Abstract]    
Senior Notes, Noncurrent 4,212,000 4,212,000
Long-term Pollution Control Bond 161,860 161,860
Other Long-term Debt, Noncurrent 2,032,700 1,724,700
Debt discount and other (203,378) (206,120)
Long-term Debt, Excluding Current Maturities, Total 6,203,182 5,892,440
Capitalization, Long-term Debt and Equity, Total 10,755,917 10,032,322
Liabilities, Current [Abstract]    
Accounts Payable, Current 311,304 342,404
Short-term Debt 231,300 373,800
Long-term Debt, Current Maturities 526,345 526,412
Accrued Expenses [Abstract]    
Taxes Payable, Current 101,153 110,752
Employee-related Liabilities, Current 37,314 42,530
Interest Payable, Current 74,304 73,647
Derivative Liability, Current 37,491 31,441
Power Contract Acquisition Adjustment Loss Current 1,893 2,039
Operating Lease, Liability, Current 19,041 19,204
Other Liabilities, Current 72,747 73,385
Liabilities, Current, Total 1,412,892 1,595,614
Longterm And Regulatory Liabilities [Abstract]    
Deferred Tax and Other Liabilities, Noncurrent 883,127 810,729
Derivative Liability, Noncurrent 18,566 29,833
Regulatory Liabilities, Noncurrent 801,161 732,498
Deferred Tax Liabilities, Regulatory Assets and Liabilities 905,522 953,274
Regulatory Liabilities Related To Power Contracts 90,978 95,774
Power Contract Acquisition Adjustment Loss Non Current 8,588 9,689
Operating Lease, Liability, Noncurrent 180,110 160,980
Other Deferred Credits 668,423 622,252
Total Longterm And Regulatory Liabilities 3,556,475 3,415,029
Commitments and Contingencies
Liabilities and Equity, Total $ 15,725,284 $ 15,042,965
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Common stock, shares authorized (in shares) 1,000 1,000
Common Stock, Shares, Outstanding 200 200
Subsidiaries [Member]    
Utility Plant [Abstract]    
Public Utilities Property Plant And Equipment Electric Plant $ 11,282,253 $ 11,035,402
Public Utilities Property Plant And Equipment Gas Plant 4,928,669 4,786,419
Public Utilities Property Plant And Equipment Common Plant 1,115,155 1,139,120
Public Utilities, Property, Plant and Equipment, Accumulated Depreciation (6,256,181) (6,087,748)
Public Utilities, Property, Plant and Equipment, Net, Total 11,069,896 10,873,193
Other Property And Investments [Abstract]    
Other Property And Investments 85,205 83,855
Total Other Property And Investments 85,205 83,855
Assets, Current [Abstract]    
Cash and Cash Equivalents, at Carrying Value 25,472 51,177
Restricted Cash and Cash Equivalents, Current 13,819 29,544
Accounts Receivable, after Allowance for Credit Loss, Current 296,715 355,850
Unbilled Revenues 160,980 221,871
Other Inventory, Supplies, Gross 120,852 118,333
Fuel And Gas Inventory At Average Cost 62,356 47,531
Derivative Asset, Current 150,371 33,015
Prepaid Expense and Other Assets, Current 46,529 45,746
Assets, Current, Total 877,094 903,067
Other Longterm And Regulatory Assets [Abstract]    
Power Cost Adjustment Mechanism Asset, Noncurrent 69,551 82,801
purchase gas adjustment, long-term 49,425 87,655
Other Regulatory Assets 768,459 747,651
Derivative Asset, Noncurrent 17,848 8,805
Operating Lease, Right-of-Use Asset 191,498 172,167
Other Assets, Noncurrent 92,174 79,231
Total Longterm And Regulatory Assets 1,188,955 1,178,310
Assets, Total 13,221,150 13,038,425
Capitalization [Abstract]    
Common stock 859 859
Additional Paid in Capital 3,485,105 3,485,105
Retained Earnings (Accumulated Deficit) 1,057,560 876,401
Accumulated Other Comprehensive Income (Loss), Net of Tax (171,847) (180,956)
Stockholders' Equity Attributable to Parent, Total 4,371,677 4,181,409
Long-term Debt, Excluding Current Maturities [Abstract]    
Senior Notes, Noncurrent 4,212,000 4,212,000
Long-term Pollution Control Bond 161,860 161,860
Debt discount and other (34,857) (35,816)
Long-term Debt, Excluding Current Maturities, Total 4,339,003 4,338,044
Capitalization, Long-term Debt and Equity, Total 8,710,680 8,519,453
Liabilities, Current [Abstract]    
Accounts Payable, Current 325,314 342,504
Short-term Debt 231,300 373,800
Long-term Debt, Current Maturities 2,345 2,412
Accrued Expenses [Abstract]    
Taxes Payable, Current 101,522 107,254
Employee-related Liabilities, Current 37,314 42,530
Interest Payable, Current 48,835 48,189
Derivative Liability, Current 37,491 31,441
Operating Lease, Liability, Current 19,041 19,204
Other Liabilities, Current 72,747 73,385
Liabilities, Current, Total 875,909 1,040,719
Longterm And Regulatory Liabilities [Abstract]    
Deferred Tax and Other Liabilities, Noncurrent 1,064,975 987,382
Derivative Liability, Noncurrent 18,566 29,833
Regulatory Liabilities, Noncurrent 799,897 731,234
Deferred Tax Liabilities, Regulatory Assets and Liabilities 906,228 953,987
Operating Lease, Liability, Noncurrent 180,110 160,980
Other Deferred Credits 664,785 614,837
Total Longterm And Regulatory Liabilities 3,634,561 3,478,253
Commitments and Contingencies  
Liabilities and Equity, Total $ 13,221,150 $ 13,038,425
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Common stock, shares authorized (in shares) 150,000,000 150,000,000
Common Stock, Shares, Outstanding 85,903,791 85,903,791