Commitments and Contingencies (Details-2) - USD ($)			6 Months Ended
		Jul. 31, 2019	Jun. 30, 2019
Operating expense purchase contracts [Abstract]
Purchase obligation, 2019			$ 19,090,000
Purchase obligation, 2020			33,055,000
Purchase obligation, 2021			24,933,000
Purchase obligation, 2022			21,685,000
Purchase obligation, 2023			21,691,000
Purchase obligation, Thereafter			66,216,000
Natural Gas, Transportation and Storage [Member]
Operating expense purchase contracts [Abstract]
Purchase obligation, 2019	[1]		10,102,000
Purchase obligation, 2020	[1]		21,700,000
Purchase obligation, 2021	[1]		21,432,000
Purchase obligation, 2022	[1]		21,432,000
Purchase obligation, 2023	[1]		21,432,000
Purchase obligation, Thereafter	[1]		54,663,000
Natual Gas, Supply [Member]
Operating expense purchase contracts [Abstract]
Purchase obligation, 2019	[2]		8,822,000
Purchase obligation, 2020	[2]		10,280,000
Purchase obligation, 2021	[2]		0
Purchase obligation, 2022	[2]		0
Purchase obligation, 2023	[2]		0
Purchase obligation, Thereafter	[2]		0
Solar farms
Operating expense purchase contracts [Abstract]
Purchase obligation, 2019	[3]		74,000
Purchase obligation, 2020	[3]		147,000
Purchase obligation, 2021	[3]		2,572,000
Purchase obligation, 2022	[3]		156,000
Purchase obligation, 2023	[3]		160,000
Purchase obligation, Thereafter	[3]		10,474,000
Badger Hollow Additional Commitments [Member] | Subsequent Event [Member]
Operating expense purchase contracts [Abstract]
Purchase obligation, 2019	[3]	$ 500,000
Purchase obligation, 2020	[3]	200,000
Purchase obligation, 2021	[3]	500,000
Purchase obligation, 2022	[3]	600,000
Purchase obligation, 2023	[3]	600,000
Purchase obligation, Thereafter	[3]	22,000,000.0
Other [Member]
Operating expense purchase contracts [Abstract]
Purchase obligation, 2019			92,000
Purchase obligation, 2020			928,000
Purchase obligation, 2021			929,000
Purchase obligation, 2022			97,000
Purchase obligation, 2023			99,000
Purchase obligation, Thereafter			1,079,000
Two Creeks Construction Commitment [Member]
Long Term Purchase Commitment [Line Items]
Minimum future capital commitments			$ 52,800,000
Badger Hollow Construction Commitment [Member] | Subsequent Event [Member]
Long Term Purchase Commitment [Line Items]
Minimum future capital commitments		$ 59,900,000

[1] 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 established by FERC but may be subject to change.

[2] These commitments include market-based pricing.

[3] In July 2019 MGE entered into additional commitments related to operations of the Badger Hollow Solar Farm. The total of these commitments by year are as follows: $0.5 million in 2019, $0.2 million in 2020, $0.5 million in 2021, $0.6 million in 2022, $0.6 million in 2023, and $22.0 million thereafter.