Commitments and Contingencies (Details-2) $ in Thousands	Jun. 30, 2025 USD ($)
Operating expense purchase contracts [Abstract]
Purchase obligation, 2025	$ 41,630
Purchase obligation, 2026	63,175
Purchase obligation, 2027	44,673
Purchase obligation, 2028	48,581
Purchase obligation, 2029	42,301
Purchase obligation, Thereafter	354,698
Coal [Member]
Operating expense purchase contracts [Abstract]
Purchase obligation, 2025	9,437	[1]
Purchase obligation, 2026	8,387	[1]
Purchase obligation, 2027	4,043	[1]
Purchase obligation, 2028	4,126	[1]
Purchase obligation, 2029	0	[1]
Purchase obligation, Thereafter	0	[1]
Natural Gas [Member]
Operating expense purchase contracts [Abstract]
Purchase obligation, 2025	26,109	[2]
Purchase obligation, 2026	51,334	[2]
Purchase obligation, 2027	37,306	[2]
Purchase obligation, 2028	41,131	[2]
Purchase obligation, 2029	40,951	[2]
Purchase obligation, Thereafter	316,598	[2]
Renewable energy [Member]
Operating expense purchase contracts [Abstract]
Purchase obligation, 2025	6,084	[3]
Purchase obligation, 2026	3,454	[3]
Purchase obligation, 2027	3,324	[3]
Purchase obligation, 2028	3,324	[3]
Purchase obligation, 2029	1,350	[3]
Purchase obligation, Thereafter	$ 38,100	[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.