CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Income Statement [Abstract]
Operating Revenues	$ 3,332,575	$ 3,795,643
Operating Expenses:
Purchased Power, Purchased Natural Gas and Transmission	1,235,956	1,903,246
Operations and Maintenance	462,964	454,562
Depreciation	339,914	312,955
Amortization	(2,325)	(76,059)
Energy Efficiency Programs	213,479	222,952
Taxes Other Than Income Taxes	236,614	228,414
Total Operating Expenses	2,486,602	3,046,070
Operating Income/(Loss)	845,973	749,573
Interest Expense	250,749	194,543
Other Income, Net	91,030	88,981
Income Before Income Tax Expense	686,254	644,011
Income Tax Expense	162,526	150,972
Net Income	523,728	493,039
Net Income Attributable to Noncontrolling Interests	1,880	1,880
Net Income Attributable to Common Shareholders	$ 521,848	$ 491,159
Basic EPS (in dollars per share)	$ 1.49	$ 1.41
Diluted EPS (in dollars per share)	$ 1.49	$ 1.41
Weighted Average Common Shares Outstanding:
Basic (in shares)	350,717,114	349,217,147
Diluted (in shares)	350,997,220	349,612,013