Schedule II - Valuation and Qualifying Accounts (Details) - USD ($)		12 Months Ended
		Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of period		$ 8,098,076	$ 8,372,840	$ 8,303,701
Charged to costs and expenses	[1]	4,850,000	3,264,309	3,814,311
Charged to other accounts		54,000	20,400	40,800
Net accounts written off	[2]	(3,972,334)	(3,559,473)	(3,785,972)
Balance at end of period		9,029,742	8,098,076	8,372,840
Deferred Bad Debt Expense [Member]
Regulatory Asset [Line Items]
Regulatory assets		400,000	$ 1,500,000	$ 2,100,000
Collection of Bad Debt Expense [Member]
Regulatory Asset [Line Items]
Regulatory assets		$ (4,900,000)

[1] For the year ended December 31, 2024, MGE recovered $4.9 million of bad debt expense as a regulatory asset. For the years ended December 31, 2024, 2023, and 2022, MGE deferred $0.4 million, $1.5 million, and $2.1 million, respectively, of bad debt expense as a regulatory asset. See Footnote 8 of the Notes to Consolidated Financial Statements in this Report for further information.

[2] Net of recovery of amounts previously written off.