Commitments and Contingencies (Details-2) $ in Thousands	Jun. 30, 2020 USD ($)
Operating expense purchase contracts [Abstract]
Purchase obligation, 2020	$ 19,148
Purchase obligation, 2021	32,745
Purchase obligation, 2022	22,008
Purchase obligation, 2023	22,008
Purchase obligation, 2024	22,008
Purchase obligation, Thereafter	36,603
Natural Gas, Transportation and Storage [Member]
Operating expense purchase contracts [Abstract]
Purchase obligation, 2020	10,254	[1]
Purchase obligation, 2021	21,854	[1]
Purchase obligation, 2022	22,008	[1]
Purchase obligation, 2023	22,008	[1]
Purchase obligation, 2024	22,008	[1]
Purchase obligation, Thereafter	36,603	[1]
Natual Gas, Supply [Member]
Operating expense purchase contracts [Abstract]
Purchase obligation, 2020	8,894	[2]
Purchase obligation, 2021	10,891	[2]
Purchase obligation, 2022	0	[2]
Purchase obligation, 2023	0	[2]
Purchase obligation, 2024	0	[2]
Purchase obligation, Thereafter	$ 0	[2]

[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.