Commitments and Contingencies (Details-2) $ in Thousands	Dec. 31, 2021 USD ($)
Purchase Obligation, Fiscal Year Maturity [Abstract]
Purchase obligation due in next twelve months	$ 100,469
Purchase obligation due in second year	43,640
Purchase obligation due in third year	35,067
Purchase obligation due in fourth year	30,944
Purchase obligation due in fifth year	19,980
Purchase obligation due thereafter	43,922
Coal [Member]
Purchase Obligation, Fiscal Year Maturity [Abstract]
Purchase obligation due in next twelve months	20,662	[1]
Purchase obligation due in second year	11,752	[1]
Purchase obligation due in third year	4,394	[1]
Purchase obligation due in fourth year	937	[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	23,307	[2]
Purchase obligation due in second year	23,922	[2]
Purchase obligation due in third year	23,922	[2]
Purchase obligation due in fourth year	23,922	[2]
Purchase obligation due in fifth year	13,772	[2]
Purchase obligation due thereafter	11,525	[2]
Natural Gas, Supply [Member]
Purchase Obligation, Fiscal Year Maturity [Abstract]
Purchase obligation due in next twelve months	26,987	[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	14,249	[4]
Purchase obligation due in second year	5,061	[4]
Purchase obligation due in third year	5,162	[4]
Purchase obligation due in fourth year	5,266	[4]
Purchase obligation due in fifth year	5,371	[4]
Purchase obligation due thereafter	5,723	[4]
Renewable energy [Member]
Purchase Obligation, Fiscal Year Maturity [Abstract]
Purchase obligation due in next twelve months	7,999	[5]
Purchase obligation due in second year	1,185	[5]
Purchase obligation due in third year	698	[5]
Purchase obligation due in fourth year	714	[5]
Purchase obligation due in fifth year	730	[5]
Purchase obligation due thereafter	25,876	[5]
Other [Member]
Purchase Obligation, Fiscal Year Maturity [Abstract]
Purchase obligation due in next twelve months	7,265
Purchase obligation due in second year	1,720
Purchase obligation due in third year	891
Purchase obligation due in fourth year	105
Purchase obligation due in fifth year	107
Purchase obligation due thereafter	$ 798

[1] Total coal commitments for 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 several purchase power agreements to help meet future electric supply requirements.

[5] Operational commitments for solar and wind facilities.