Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Operating Activities:
Net Income	$ 31,078	$ 34,420
Items not affecting cash:
Depreciation and amortization	24,611	21,046
Deferred income taxes	6,056	5,606
Provision for doubtful receivables	441	441
Employee benefit plan cost (credit)	(648)	(1,678)
Equity earnings in investments	(2,611)	(2,504)
Other items	(1,366)	(486)
Changes in working capital items:
Decrease in current assets	28,211	12,332
Decrease in accounts payable	(18,509)	(11,258)
(Decrease) increase in other current liabilities	(6,742)	4,143
Dividends from investments	2,206	2,001
Cash contributions to pension and other postretirement plans	(1,785)	(1,660)
Other noncurrent items, net	(4,939)	(304)
Cash Provided by Operating Activities	56,003	62,099
Investing Activities:
Capital expenditures	(47,556)	(30,778)
Capital contributions to investments	(1,527)	(1,546)
Other	(483)	155
Cash Used for Investing Activities	(49,566)	(32,169)
Financing Activities:
Cash dividends paid on common stock	(14,736)	(14,013)
Repayments of long-term debt	(20,542)	(1,211)
Issuance of long-term debt	69,300	0
Repayments of short-term debt	(37,500)	(5,500)
Other	(1,296)	(492)
Cash Used for Financing Activities	(4,774)	(21,216)
Change in cash, cash equivalents, and restricted cash	1,663	8,714
Cash, cash equivalents, and restricted cash at beginning of period	17,968	18,835
Cash, cash equivalents, and restricted cash at end of period	19,631	27,549
Significant noncash investing activities:
Accrued capital expenditures	4,402	6,735
MGE [Member]
Operating Activities:
Net Income	29,643	32,053
Items not affecting cash:
Depreciation and amortization	24,611	21,046
Deferred income taxes	5,679	5,230
Provision for doubtful receivables	441	441
Employee benefit plan cost (credit)	(648)	(1,678)
Other items	(1,146)	587
Changes in working capital items:
Decrease in current assets	27,758	11,810
Decrease in accounts payable	(18,515)	(11,258)
(Decrease) increase in other current liabilities	(4,835)	6,610
Cash contributions to pension and other postretirement plans	(1,785)	(1,660)
Other noncurrent items, net	(5,224)	(500)
Cash Provided by Operating Activities	55,979	62,681
Investing Activities:
Capital expenditures	(47,556)	(30,778)
Other	(387)	(164)
Cash Used for Investing Activities	(47,943)	(30,942)
Financing Activities:
Cash dividends paid to parent by MGE	(12,500)	(5,000)
Distributions to parent from noncontrolling interest	(6,000)	(9,000)
Repayments of long-term debt	(20,542)	(1,211)
Issuance of long-term debt	69,300	0
Repayments of short-term debt	(37,500)	(5,500)
Other	(1,296)	(492)
Cash Used for Financing Activities	(8,538)	(21,203)
Change in cash, cash equivalents, and restricted cash	(502)	10,536
Cash, cash equivalents, and restricted cash at beginning of period	10,500	7,798
Cash, cash equivalents, and restricted cash at end of period	9,998	18,334
Significant noncash investing activities:
Accrued capital expenditures	$ 4,402	$ 6,735