CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Income Statement [Abstract]
Operating Revenues	$ 3,795,643	$ 3,471,310
Operating Expenses:
Purchased Power, Purchased Natural Gas and Transmission	1,903,246	1,389,696
Operations and Maintenance	454,562	472,433
Depreciation	312,955	289,330
Amortization	(76,059)	236,948
Energy Efficiency Programs	222,952	199,484
Taxes Other Than Income Taxes	228,414	220,364
Total Operating Expenses	3,046,070	2,808,255
Operating Income/(Loss)	749,573	663,055
Interest Expense	194,543	153,245
Other Income, Net	88,981	71,561
Income Before Income Tax Expense	644,011	581,371
Income Tax Expense	150,972	136,045
Net Income	493,039	445,326
Net Income Attributable to Noncontrolling Interests	1,880	1,880
Net Income Attributable to Common Shareholders	$ 491,159	$ 443,446
Basic EPS (in dollars per share)	$ 1.41	$ 1.28
Diluted EPS (in dollars per share)	$ 1.41	$ 1.28
Weighted Average Common Shares Outstanding:
Basic (in shares)	349,217,147	345,156,346
Diluted (in shares)	349,612,013	345,661,133