Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Operating Activities:
Net Income	$ 59,759	$ 56,181
Items not affecting cash:
Depreciation and amortization	49,730	42,333
Deferred income taxes	12,713	11,990
Provision for doubtful receivables	882	882
Employee benefit plan cost (credit)	(1,227)	(4,146)
Equity earnings in investments	(5,240)	(5,127)
Other items	(885)	(865)
Changes in working capital items:
Decrease in current assets	34,098	4,800
Decrease in accounts payable	(20,508)	(610)
(Decrease) increase in other current liabilities	(2,105)	7,059
Dividends from investments	4,248	3,959
Cash contributions to pension and other postretirement plans	(3,540)	(3,351)
Other noncurrent items, net	(934)	(1,829)
Cash Provided by Operating Activities	126,991	111,276
Investing Activities:
Capital expenditures	(107,701)	(65,959)
Capital contributions to investments	(3,376)	(3,330)
Other	(682)	226
Cash Used for Investing Activities	(111,759)	(69,063)
Financing Activities:
Cash dividends paid on common stock	(29,473)	(28,027)
Repayments of long-term debt	(21,791)	(2,429)
Issuance of long-term debt	69,300	0
Repayments of short-term debt	(28,500)	(5,500)
Other	(1,479)	(612)
Cash Used for Financing Activities	(11,943)	(36,568)
Change in cash, cash equivalents, and restricted cash	3,289	5,645
Cash, cash equivalents, and restricted cash at beginning of period	17,968	18,835
Cash, cash equivalents, and restricted cash at end of period	21,257	24,480
Significant noncash investing activities:
Accrued capital expenditures	6,446	40,434
MGE [Member]
Operating Activities:
Net Income	57,250	51,680
Items not affecting cash:
Depreciation and amortization	49,730	42,333
Deferred income taxes	11,955	11,248
Provision for doubtful receivables	882	882
Employee benefit plan cost (credit)	(1,227)	(4,146)
Other items	(1,344)	851
Changes in working capital items:
Decrease in current assets	33,520	3,605
Decrease in accounts payable	(20,560)	(623)
(Decrease) increase in other current liabilities	(188)	9,303
Cash contributions to pension and other postretirement plans	(3,540)	(3,351)
Other noncurrent items, net	(1,428)	(2,233)
Cash Provided by Operating Activities	125,050	109,549
Investing Activities:
Capital expenditures	(107,701)	(65,959)
Other	(805)	(341)
Cash Used for Investing Activities	(108,506)	(66,300)
Financing Activities:
Cash dividends paid to parent by MGE	(21,000)	(12,000)
Distributions to parent from noncontrolling interest	(10,250)	(13,250)
Repayments of long-term debt	(21,791)	(2,429)
Issuance of long-term debt	69,300	0
Repayments of short-term debt	(28,500)	(5,500)
Other	(1,479)	(612)
Cash Used for Financing Activities	(13,720)	(33,791)
Change in cash, cash equivalents, and restricted cash	2,824	9,458
Cash, cash equivalents, and restricted cash at beginning of period	10,500	7,798
Cash, cash equivalents, and restricted cash at end of period	13,324	17,256
Significant noncash investing activities:
Accrued capital expenditures	$ 6,446	$ 40,434