Commitments and Contingencies (Details-2) $ in Thousands	Dec. 31, 2019 USD ($)
Purchase Obligation, Fiscal Year Maturity [Abstract]
Purchase obligation due in next twelve months	$ 83,721
Purchase obligation due in second year	61,651
Purchase obligation due in third year	56,103
Purchase obligation due in fourth year	39,576
Purchase obligation due in fifth year	28,896
Purchase obligation due thereafter	88,625
Coal [Member]
Purchase Obligation, Fiscal Year Maturity [Abstract]
Purchase obligation due in next twelve months	17,549	[1]
Purchase obligation due in second year	5,668	[1]
Purchase obligation due in third year	2,323	[1]
Purchase obligation due in fourth year	0	[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	21,728	[2]
Purchase obligation due in second year	21,728	[2]
Purchase obligation due in third year	21,728	[2]
Purchase obligation due in fourth year	21,728	[2]
Purchase obligation due in fifth year	21,728	[2]
Purchase obligation due thereafter	34,117	[2]
Natural Gas, Supply [Member]
Purchase Obligation, Fiscal Year Maturity [Abstract]
Purchase obligation due in next twelve months	9,912	[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]
Purchase Power [Member]
Purchase Obligation, Fiscal Year Maturity [Abstract]
Purchase obligation due in next twelve months	26,576	[4]
Purchase obligation due in second year	26,535	[4]
Purchase obligation due in third year	27,952	[4]
Purchase obligation due in fourth year	15,216	[4]
Purchase obligation due in fifth year	5,636	[4]
Purchase obligation due thereafter	21,815	[4]
Other [Member]
Purchase Obligation, Fiscal Year Maturity [Abstract]
Purchase obligation due in next twelve months	7,646
Purchase obligation due in second year	4,403
Purchase obligation due in third year	3,374
Purchase obligation due in fourth year	1,889
Purchase obligation due in fifth year	773
Purchase obligation due thereafter	978
Solar Farms
Purchase Obligation, Fiscal Year Maturity [Abstract]
Purchase obligation due in next twelve months	310	[5]
Purchase obligation due in second year	3,317	[5]
Purchase obligation due in third year	726	[5]
Purchase obligation due in fourth year	743	[5]
Purchase obligation due in fifth year	759	[5]
Purchase obligation due thereafter	$ 31,715	[5]

[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] In 2019, MGE entered into commitments related to the operations of Two Creeks and Badger Hollow I.