CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Income Statement [Abstract]
Operating Revenues	$ 3,471,310	$ 2,825,840
Operating Expenses:
Purchased Power, Fuel and Transmission	1,389,696	998,491
Operations and Maintenance	472,433	465,542
Depreciation	289,330	270,704
Amortization	236,948	108,013
Energy Efficiency Programs	199,484	188,063
Taxes Other Than Income Taxes	220,364	209,459
Total Operating Expenses	2,808,255	2,240,272
Operating Income/(Loss)	663,055	585,568
Interest Expense	153,245	137,766
Other Income, Net	71,561	34,201
Income Before Income Tax Expense	581,371	482,003
Income Tax Expense	136,045	113,980
Net Income	445,326	368,023
Net Income Attributable to Noncontrolling Interests	1,880	1,880
Net Income Attributable to Common Shareholders	$ 443,446	$ 366,143
Basic EPS (in dollars per share)	$ 1.28	$ 1.07
Diluted EPS (in dollars per share)	$ 1.28	$ 1.06
Weighted Average Common Shares Outstanding:
Basic (in shares)	345,156,346	343,678,243
Diluted (in shares)	345,661,133	344,334,689