Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023
Operating Activities:
Net income	$ 138,112	$ 124,888
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	111,037	94,677
Deferred income taxes and investment tax credits	(32,353)	(15,209)
Changes in regulatory assets and liabilities	84,333	(8,255)
Pension and postretirement benefit plan expense	22,787	13,626
Contributions to pension and postretirement benefit plans	(2,616)	(13,818)
Earnings of unconsolidated equity-method investments	(1,902)	(5,192)
Allowance for equity funds used during construction	(24,431)	(21,081)
Other non-cash adjustments to net income, net	2,896	3,550
Change in:
Accounts receivable and unbilled revenues	(24,211)	(28,539)
Prepayments	(2,624)	(2,762)
Materials, supplies, and fuel stock	(39,562)	(30,490)
Accounts and wages payable	(43,666)	(138,469)
Taxes accrued/receivable	37,039	35,809
Other assets and liabilities	31,208	(1,956)
Net cash provided by operating activities	256,047	6,779
Investing Activities:
Additions to utility plant, net	(605,902)	(274,167)
Payments received from transmission project joint funding partners	39,912	8,953
Other	7,573	1,415
Net cash used in investing activities	(558,417)	(263,799)
Financing Activities:
Issuance of long-term debt	0	522,000
Discount on issuance of long-term debt	0	(3,772)
Retirement of long-term debt	0	(225,000)
Dividends on common stock	(84,886)	(80,538)
Issuance of Common Stock	233,178	0
Tax withholdings on net settlements of share-based awards	(3,694)	(3,255)
Other	(98)	4,787
Net cash provided by financing activities	144,500	214,222
Net decrease in cash and cash equivalents	(157,870)	(42,798)
Cash and cash equivalents at beginning of the period	327,429	177,577
Cash and cash equivalents at end of the period	169,559	134,779
Supplemental Disclosure of Cash Flow Information:
Income taxes	1,510	0
Interest (net of amount capitalized)	55,910	43,927
Non-cash investing activities:
Additions to property, plant and equipment in accounts payable	$ 101,178	$ 137,717