Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Operating Activities:
Net Income	$ 89,901	$ 92,701
Items not affecting cash:
Depreciation and amortization	63,780	55,968
Deferred income taxes	18,021	1,955
Provision for doubtful receivables	1,323	1,163
Employee benefit plan cost (credit)	(6,087)	(935)
Equity earnings in investments	(6,626)	(7,440)
Other items	(2,821)	(618)
Changes in working capital items:
Increase in current assets	(5,992)	(11,240)
(Decrease) increase in current liabilities	(5,831)	4,429
Dividends from investment	5,964	5,842
Cash contributions to pension and other postretirement plans	(5,095)	(4,823)
Other noncurrent items, net	(2,255)	4,295
Cash Provided by Operating Activities	144,282	141,297
Investing Activities:
Capital expenditures	(133,409)	(114,142)
Capital contributions to investments	(3,938)	(4,227)
Other	128	22
Cash Used for Investing Activities	(137,219)	(118,347)
Financing Activities:
Cash dividends paid on common stock	(42,763)	(40,774)
Repayments of long-term debt	(3,655)	(3,567)
Issuance of long-term debt	0	100,000
Proceeds from (repayments of) short-term debt	34,500	(52,500)
Other	(745)	(1,503)
Cash (Used for) Provided by Financing Activities	(12,663)	1,656
Change in cash, cash equivalents, and restricted cash	(5,600)	24,606
Cash, cash equivalents, and restricted cash at beginning of period	18,835	47,039
Cash, cash equivalents, and restricted cash at end of period	13,235	71,645
Significant noncash investing activities:
Accrued capital expenditures	11,218	8,213
MGE [Member]
Operating Activities:
Net Income	84,481	87,529
Items not affecting cash:
Depreciation and amortization	63,780	55,968
Deferred income taxes	17,706	1,375
Provision for doubtful receivables	1,323	1,163
Employee benefit plan cost (credit)	(6,087)	(935)
Other items	(636)	864
Changes in working capital items:
Increase in current assets	(7,238)	(11,777)
(Decrease) increase in current liabilities	(3,642)	2,528
Cash contributions to pension and other postretirement plans	(5,095)	(4,823)
Other noncurrent items, net	(2,806)	3,559
Cash Provided by Operating Activities	141,786	135,451
Investing Activities:
Capital expenditures	(133,409)	(114,142)
Other	(680)	(1,449)
Cash Used for Investing Activities	(134,089)	(115,591)
Financing Activities:
Cash dividends paid to parent by MGE	(21,000)	0
Distributions to parent from noncontrolling interest	(17,500)	(10,500)
Repayments of long-term debt	(3,655)	(3,567)
Issuance of long-term debt	0	100,000
Proceeds from (repayments of) short-term debt	34,500	(52,500)
Other	(745)	(1,503)
Cash (Used for) Provided by Financing Activities	(8,400)	31,930
Change in cash, cash equivalents, and restricted cash	(703)	51,790
Cash, cash equivalents, and restricted cash at beginning of period	7,798	6,404
Cash, cash equivalents, and restricted cash at end of period	7,095	58,194
Significant noncash investing activities:
Accrued capital expenditures	$ 11,218	$ 8,213