Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Operating Activities:
Net Income	$ 98,547	$ 97,616
Items not affecting cash:
Depreciation and amortization	80,636	74,971
Deferred income taxes	170	16,326
Provision for doubtful receivables	6,600	1,323
Employee benefit plan cost (credit)	424	(2,976)
Equity earnings in investments	(8,427)	(7,930)
Other items	1,247	(2,502)
Changes in working capital items:
Current assets	27,544	33,976
Accounts payable	(11,699)	(16,586)
Deferred income taxes	7,146	0
Other current liabilities	2,120	(3,714)
Dividends from investments	6,414	6,305
Cash contributions to pension and other postretirement plans	(5,511)	(5,290)
Other noncurrent items, net	4,625	2,519
Cash Provided by Operating Activities	209,836	194,038
Investing Activities:
Capital expenditures	(164,064)	(150,298)
Capital contributions to investments	(4,348)	(5,986)
Other	801	(206)
Cash Used for Investing Activities	(167,611)	(156,490)
Financing Activities:
Issuance of common stock, net	2,591	0
Cash dividends paid on common stock	(47,210)	(44,933)
Repayments of long-term debt	(3,847)	(53,048)
Issuance of long-term debt	0	109,300
Proceeds from (repayments of) short-term debt	10,500	(48,500)
Other	(879)	(2,128)
Cash Used for Financing Activities	(38,845)	(39,309)
Change in cash, cash equivalents, and restricted cash	3,380	(1,761)
Cash, cash equivalents, and restricted cash at beginning of period	15,026	17,968
Cash, cash equivalents, and restricted cash at end of period	18,406	16,207
Significant noncash investing activities:
Accrued capital expenditures	9,194	17,716
MGE [Member]
Operating Activities:
Net Income	93,064	93,202
Items not affecting cash:
Depreciation and amortization	80,636	74,971
Deferred income taxes	387	15,218
Provision for doubtful receivables	6,600	1,323
Employee benefit plan cost (credit)	424	(2,976)
Other items	1,911	(2,604)
Changes in working capital items:
Current assets	27,668	33,076
Accounts payable	(11,697)	(16,583)
Deferred income taxes	7,146	0
Other current liabilities	2,904	(1,809)
Cash contributions to pension and other postretirement plans	(5,511)	(5,290)
Other noncurrent items, net	3,171	1,840
Cash Provided by Operating Activities	206,703	190,368
Investing Activities:
Capital expenditures	(164,064)	(150,298)
Other	(1,447)	(1,338)
Cash Used for Investing Activities	(165,511)	(151,636)
Financing Activities:
Cash dividends paid to parent by MGE	(31,000)	(30,000)
Distributions to parent from noncontrolling interest	(16,000)	(17,250)
Repayments of long-term debt	(3,847)	(53,048)
Issuance of long-term debt	0	109,300
Proceeds from (repayments of) short-term debt	10,500	(48,500)
Other	(879)	(2,128)
Cash Used for Financing Activities	(41,226)	(41,626)
Change in cash, cash equivalents, and restricted cash	(34)	(2,894)
Cash, cash equivalents, and restricted cash at beginning of period	6,705	10,500
Cash, cash equivalents, and restricted cash at end of period	6,671	7,606
Significant noncash investing activities:
Accrued capital expenditures	$ 9,194	$ 17,716