CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Income Statement [Abstract]
Operating Revenues	$ 4,504,363	$ 4,118,355
Operating Expenses:
Purchased Power, Purchased Natural Gas and Transmission	1,518,174	1,340,337
Operations and Maintenance	506,980	487,451
Depreciation	420,481	379,579
Amortization	402,764	455,449
Energy Efficiency Programs	291,499	257,550
Taxes Other Than Income Taxes	288,317	271,595
Total Operating Expenses	3,428,215	3,191,961
Operating Income	1,076,148	926,394
Interest Expense	365,259	300,849
Other Income, Net	101,159	92,344
Income Before Income Tax Expense	812,048	717,889
Income Tax Expense	203,327	165,221
Net Income	608,721	552,668
Net Income Attributable to Noncontrolling Interests	1,880	1,880
Net Income Attributable to Common Shareholders	$ 606,841	$ 550,788
Basic Earnings Per Common Share (in dollars per share)	$ 1.61	$ 1.50
Diluted Earnings Per Common Share (in dollars per share)	$ 1.61	$ 1.50
Weighted Average Common Shares Outstanding:
Basic (in shares)	376,026,090	367,320,246
Diluted (in shares)	376,583,614	367,677,618