Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Operating Activities:
Net Income	$ 56,181	$ 57,784
Items not affecting cash:
Depreciation and amortization	42,333	36,977
Deferred income taxes	11,990	114
Provision for doubtful receivables	882	775
Employee benefit plan cost (credit)	(4,146)	319
Equity earnings in investments	(5,127)	(4,908)
Other items	(865)	3,994
Changes in working capital items:
Decrease (increase) in current assets	4,800	(4,999)
Increase (decrease) in current liabilities	6,449	(15,495)
Dividends from investment	3,959	3,900
Cash contributions to pension and other postretirement plans	(3,351)	(3,087)
Other noncurrent items, net	(1,829)	3,159
Cash Provided by Operating Activities	111,276	78,533
Investing Activities:
Capital expenditures	(65,959)	(75,667)
Capital contributions to investments	(3,330)	(2,340)
Other	226	(1)
Cash Used for Investing Activities	(69,063)	(78,008)
Financing Activities:
Cash dividends paid on common stock	(28,027)	(26,761)
Repayments of long-term debt	(2,429)	(2,371)
Proceeds from Issuance of Long-Term Debt	0	40,000
Repayments of short-term debt	(5,500)	(21,500)
Other	(612)	(1,338)
Cash (Used for) Provided by Financing Activities	(36,568)	(11,970)
Change in cash, cash equivalents, and restricted cash	5,645	(11,445)
Cash, cash equivalents, and restricted cash at beginning of period	18,835	47,039
Cash, cash equivalents, and restricted cash at end of period	24,480	35,594
Significant noncash investing activities:
Accrued capital expenditures	40,434	12,426
MGE [Member]
Operating Activities:
Net Income	51,680	54,528
Items not affecting cash:
Depreciation and amortization	42,333	36,977
Deferred income taxes	11,248	132
Provision for doubtful receivables	882	775
Employee benefit plan cost (credit)	(4,146)	319
Other items	851	4,892
Changes in working capital items:
Decrease (increase) in current assets	3,605	(12,170)
Increase (decrease) in current liabilities	8,680	(13,873)
Cash contributions to pension and other postretirement plans	(3,351)	(3,087)
Other noncurrent items, net	(2,233)	2,653
Cash Provided by Operating Activities	109,549	71,146
Investing Activities:
Capital expenditures	(65,959)	(75,667)
Other	(341)	(955)
Cash Used for Investing Activities	(66,300)	(76,622)
Financing Activities:
Cash dividends paid to parent by MGE	(12,000)	0
Distributions to parent from noncontrolling interest	(13,250)	(7,500)
Repayments of long-term debt	(2,429)	(2,371)
Proceeds from Issuance of Long-Term Debt	0	40,000
Repayments of short-term debt	(5,500)	(21,500)
Other	(612)	(1,338)
Cash (Used for) Provided by Financing Activities	(33,791)	7,291
Change in cash, cash equivalents, and restricted cash	9,458	1,815
Cash, cash equivalents, and restricted cash at beginning of period	7,798	6,404
Cash, cash equivalents, and restricted cash at end of period	17,256	8,219
Significant noncash investing activities:
Accrued capital expenditures	$ 40,434	$ 12,426