CONSOLIDATED STATEMENTS OF (LOSS)/INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income Statement [Abstract]
Operating Revenues	$ 11,910,705	$ 12,289,336	$ 9,863,085
Operating Expenses:
Purchased Power, Purchased Natural Gas and Transmission	5,168,241	5,014,074	3,372,344
Operations and Maintenance	1,895,703	1,865,328	1,739,685
Depreciation	1,305,840	1,194,246	1,103,008
Amortization	(490,117)	448,892	231,965
Energy Efficiency Programs	691,344	658,051	592,775
Taxes Other Than Income Taxes	940,359	910,591	829,987
Total Operating Expenses	9,511,370	10,091,182	7,869,764
Operating Income	2,399,335	2,198,154	1,993,321
Interest Expense	855,441	678,274	582,334
Impairments of Offshore Wind Investments	2,167,000	0	0
Other Income, Net	348,069	346,088	161,282
(Loss)/Income Before Income Tax Expense	(275,037)	1,865,968	1,572,269
Income Tax Expense	159,684	453,574	344,223
Net (Loss)/Income	(434,721)	1,412,394	1,228,046
Net Income Attributable to Noncontrolling Interests	7,519	7,519	7,519
Net (Loss)/Income Attributable to Common Shareholders	$ (442,240)	$ 1,404,875	$ 1,220,527
Basic (Loss)/Earnings Per Common Share (in dollars per share)	$ (1.27)	$ 4.05	$ 3.55
Diluted (Loss)/Earnings Per Common Share (in dollars per share)	$ (1.26)	$ 4.05	$ 3.54
Weighted Average Common Shares Outstanding:
Basic (in shares)	349,580,638	346,783,444	343,972,926
Diluted (in shares)	349,840,481	347,246,768	344,631,056