Commitments and Contingencies (Details-2) $ in Thousands	Dec. 31, 2022 USD ($)
Purchase Obligation, Fiscal Year Maturity [Abstract]
Purchase obligation due in next twelve months	$ 116,752
Purchase obligation due in second year	52,422
Purchase obligation due in third year	41,353
Purchase obligation due in fourth year	25,869
Purchase obligation due in fifth year	10,039
Purchase obligation due thereafter	38,096
Coal [Member]
Purchase Obligation, Fiscal Year Maturity [Abstract]
Purchase obligation due in next twelve months	23,886	[1]
Purchase obligation due in second year	17,104	[1]
Purchase obligation due in third year	7,782	[1]
Purchase obligation due in fourth year	2,868	[1]
Purchase obligation due in fifth year	0	[1]
Purchase obligation due thereafter	0	[1]
Natural Gas, Transportation and Storage [Member]
Purchase Obligation, Fiscal Year Maturity [Abstract]
Purchase obligation due in next twelve months	25,446	[2]
Purchase obligation due in second year	25,446	[2]
Purchase obligation due in third year	25,446	[2]
Purchase obligation due in fourth year	14,736	[2]
Purchase obligation due in fifth year	1,892	[2]
Purchase obligation due thereafter	10,549	[2]
Natural Gas, Supply [Member]
Purchase Obligation, Fiscal Year Maturity [Abstract]
Purchase obligation due in next twelve months	30,778	[3]
Purchase obligation due in second year	0	[3]
Purchase obligation due in third year	0	[3]
Purchase obligation due in fourth year	0	[3]
Purchase obligation due in fifth year	0	[3]
Purchase obligation due thereafter	0	[3]
Purchased Power [Member]
Purchase Obligation, Fiscal Year Maturity [Abstract]
Purchase obligation due in next twelve months	5,513	[4]
Purchase obligation due in second year	5,623	[4]
Purchase obligation due in third year	5,735	[4]
Purchase obligation due in fourth year	5,850	[4]
Purchase obligation due in fifth year	5,967	[4]
Purchase obligation due thereafter	266	[4]
Renewable energy [Member]
Purchase Obligation, Fiscal Year Maturity [Abstract]
Purchase obligation due in next twelve months	25,024	[5]
Purchase obligation due in second year	2,025	[5]
Purchase obligation due in third year	2,040	[5]
Purchase obligation due in fourth year	2,056	[5]
Purchase obligation due in fifth year	2,072	[5]
Purchase obligation due thereafter	26,592	[5]
Other [Member]
Purchase Obligation, Fiscal Year Maturity [Abstract]
Purchase obligation due in next twelve months	6,105
Purchase obligation due in second year	2,224
Purchase obligation due in third year	350
Purchase obligation due in fourth year	359
Purchase obligation due in fifth year	108
Purchase obligation due thereafter	$ 689

[1] Total coal commitments for MGE's share of the Columbia and Elm Road Units, including transportation. Fuel procurement for MGE's jointly owned Columbia and Elm Road Units is handled by WPL and WEPCO, respectively, who are the operators of those facilities.

[2] MGE's natural gas transportation and storage contracts require fixed monthly payments for firm supply pipeline transportation and storage capacity. The pricing components of the fixed monthly payments for the transportation and storage contracts are approved by FERC but may be subject to change.

[3] These commitments include market-based pricing.

[4] MGE has a purchase power agreement to help meet future electric supply requirements.

[5] Operational commitments for solar and wind facilities.