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Commitments and Contingencies (Details-2)
$ in Thousands
Sep. 30, 2016
USD ($)
Operating expense purchase contracts [Abstract]  
Purchase obligation, 2016 $ 40,926
Purchase obligation, 2017 49,973
Purchase obligation, 2018 33,284
Purchase obligation, 2019 23,332
Purchase obligation, 2020 15,225
Purchase obligation, Thereafter 31,767
Coal [Member]  
Operating expense purchase contracts [Abstract]  
Purchase obligation, 2016 23,260 [1]
Purchase obligation, 2017 16,535 [1]
Purchase obligation, 2018 12,640 [1]
Purchase obligation, 2019 3,850 [1]
Purchase obligation, 2020 0 [1]
Purchase obligation, Thereafter 0 [1]
Natural Gas, Transportation and Storage [Member]  
Operating expense purchase contracts [Abstract]  
Purchase obligation, 2016 6,005 [2]
Purchase obligation, 2017 20,858 [2]
Purchase obligation, 2018 20,644 [2]
Purchase obligation, 2019 19,482 [2]
Purchase obligation, 2020 15,225 [2]
Purchase obligation, Thereafter 31,767 [2]
Natual Gas, Supply [Member]  
Operating expense purchase contracts [Abstract]  
Purchase obligation, 2016 11,661 [3]
Purchase obligation, 2017 12,580 [3]
Purchase obligation, 2018 0 [3]
Purchase obligation, 2019 0 [3]
Purchase obligation, 2020 0 [3]
Purchase obligation, Thereafter $ 0 [3]
[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. If any minimum purchase obligations must be paid under these contracts, management believes these obligations would be considered costs of service and recoverable in rates.
[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 established by FERC but may be subject to change. Management expects to recover these costs in future customer rates .
[3] These commitments include market-based pricing. Management expects to recover these costs in future customer rates .