Unaudited Condensed Consolidated Statements Of Cash Flows - USD ($)	6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023
CASH FLOWS FROM OPERATIONS:
Net income	$ 35,657,000	$ 27,121,000
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	163,353,000	140,271,000
Amortization of deferred financing costs and debt discounts	1,884,000	1,919,000
Deferred income taxes and investment tax credit adjustments - net	5,984,000	33,750,000
Allowance for equity funds used during construction	(2,100,000)	(3,955,000)
Gain (Loss) on Disposition of Intangible Assets	1,537,000	0
Change in certain assets and liabilities:
Accounts receivable	(56,359,000)	41,473,000
Inventories	6,263,000	(12,834,000)
Accounts payable	(27,191,000)	11,308,000
Accrued and other current liabilities	(8,997,000)	1,252,000
Accrued taxes payable/receivable	15,043,000	(29,893,000)
Accrued interest	12,795,000	(810,000)
Pension and other postretirement benefit assets and liabilities	1,227,000	854,000
Current and non-current regulatory assets and liabilities	(101,421,000)	129,825,000
Prepayments and other current assets	10,471,000	24,175,000
Increase (Decrease) in Other Noncurrent Liabilities	2,007,000	(13,793,000)
Other - net	(8,464,000)	(11,387,000)
Net cash provided by operating activities	30,747,000	290,926,000
CASH FLOWS FROM INVESTING ACTIVITIES:
Capital expenditures	(537,870,000)	(308,277,000)
Project development costs	(1,178,000)	(3,269,000)
Payments to Acquire Businesses, Net of Cash Acquired	(47,948,000)	0
Cost of removal payments	(17,259,000)	(26,385,000)
Net cash used in investing activities	(604,255,000)	(333,031,000)
CASH FLOWS FROM FINANCING ACTIVITIES:
Borrowings under revolving credit facilities	475,000,000	0
Repayments under revolving credit facilities	(390,000,000)	0
Borrowings under revolving credit facilities	92,000,000	0
Short-term borrowings from affiliate	1,050,000,000	0
Repayments of Short-term Debt	(392,000,000)	0
Retirement of long-term borrowings	(405,000,000)	0
Distributions to shareholders	57,094,000	66,941,000
Proceeds from Contributions from Parent	150,000,000	0
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders	(675,000)	0
Noncontrolling Interest, Increase from Sale of Parent Equity Interest	(46,935,000)	0
Payments for financing fees	(13,922,000)	(11,000)
Proceeds received from termination of interest rate swaps	23,114,000	0
Payments of Financing Costs	(21,000)	(313,000)
Net cash provided by / (used in) financing activities	578,337,000	(67,265,000)
Net change in cash, cash equivalents and restricted cash	4,829,000	(109,370,000)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	33,413,000	92,183,000
Cash paid during the period for:
Interest (net of amount capitalized)	72,191,000	63,642,000
Non-cash investing activities:
Capital Expenditures Incurred but Not yet Paid	122,492,000	70,677,000
Right-of-Use Asset Obtained in Exchange for Finance Lease Liability	72,066,000	1,380,000
Change in Right-of-Use Asset Lease Liability	(69,114,000)	1,380,000
Proceeds from Insurance Settlement, Investing Activities	$ 0	$ 4,900,000