Commitments and Contingencies (Details-2) $ in Thousands	Sep. 30, 2025 USD ($)
Operating expense purchase contracts [Abstract]
Purchase obligation, 2025	$ 33,532
Purchase obligation, 2026	71,191
Purchase obligation, 2027	68,640
Purchase obligation, 2028	74,307
Purchase obligation, 2029	65,690
Purchase obligation, Thereafter	427,302
Coal [Member]
Operating expense purchase contracts [Abstract]
Purchase obligation, 2025	6,464	[1]
Purchase obligation, 2026	10,310	[1]
Purchase obligation, 2027	6,181	[1]
Purchase obligation, 2028	6,349	[1]
Purchase obligation, 2029	0	[1]
Purchase obligation, Thereafter	0	[1]
Natural Gas [Member]
Operating expense purchase contracts [Abstract]
Purchase obligation, 2025	21,852	[2]
Purchase obligation, 2026	57,294	[2]
Purchase obligation, 2027	59,042	[2]
Purchase obligation, 2028	64,541	[2]
Purchase obligation, 2029	64,360	[2]
Purchase obligation, Thereafter	389,522	[2]
Renewable energy [Member]
Operating expense purchase contracts [Abstract]
Purchase obligation, 2025	5,216	[3]
Purchase obligation, 2026	3,587	[3]
Purchase obligation, 2027	3,417	[3]
Purchase obligation, 2028	3,417	[3]
Purchase obligation, 2029	1,330	[3]
Purchase obligation, Thereafter	$ 37,780	[3]

[1] Total coal commitments for MGE's share of the Columbia and Elm Road Units, including transportation. Fuel procurement for MGE's jointly owned Columbia and Elm Road Units is handled by Wisconsin Power and Light Company 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. MGE's natural gas supply commitments include market-based pricing.

[3] Operational commitments for solar and wind facilities.