Summary of Significant Accounting Policies - Schedule of Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Utility Plant and Depreciation [Line Items]
Net	$ 16,833,524	$ 15,803,127
Construction work in progress	1,592,659	1,724,004
Intangible assets, net of accumulated amortization	591,310	267,110
Nuclear fuel, net of accumulated amortization	97,850	99,490
Total property, plant and equipment	19,197,899	17,980,157
Electric Service
Utility Plant and Depreciation [Line Items]
Generation	11,111,915	10,446,291
Transmission	4,135,970	3,773,253
Distribution	9,016,843	8,448,293
General plant	1,596,222	1,543,330
Plant in service and held for future use	25,860,950	24,211,167
Accumulated depreciation and amortization	(9,027,426)	(8,408,040)
Net	16,833,524	15,803,127
Construction work in progress	1,592,659	1,724,004
Intangible assets, net of accumulated amortization	591,310	267,110
Nuclear fuel, net of accumulated amortization	97,850	99,490
Total property, plant and equipment	19,197,899	17,980,157
Electric Service | Variable Interest Entity
Utility Plant and Depreciation [Line Items]
Total property, plant and equipment	$ 82,556	$ 86,426