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Commitments and Contingencies (Tables) | 12 Months Ended
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Dec. 31, 2025
Commitments and Contingencies Disclosure [Abstract] |
Contractual Obligation, Fiscal Year Maturity Schedule | As of December 31, 2025, the future minimum commitments related to these purchase contracts were as follows:
(In thousands) |  | 2026 |  |  | 2027 |  |  | 2028 |  |  | 2029 |  |  | 2030 |  |  | Thereafter |
Coal(a) |  | $ | 15,564 |  |  | $ | 8,207 |  |  | $ | 6,349 |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Natural gas(b) |  |  | 52,875 |  |  |  | 56,266 |  |  |  | 61,430 |  |  |  | 61,249 |  |  |  | 61,199 |  |  |  | 312,947 |
Purchase power(c) |  |  | 5,980 |  |  |  | 5,795 |  |  |  | 258 |  |  |  | — |  |  |  | — |  |  |  | — |
Renewable energy(d) |  |  | 7,369 |  |  |  | 3,403 |  |  |  | 3,434 |  |  |  | 1,385 |  |  |  | 1,413 |  |  |  | 36,370 |
Other |  |  | 9,393 |  |  |  | 2,779 |  |  |  | 1,396 |  |  |  | 842 |  |  |  | 828 |  |  |  | 1,220 |
|  | $ | 91,181 |  |  | $ | 76,450 |  |  | $ | 72,867 |  |  | $ | 63,476 |  |  | $ | 63,440 |  |  | $ | 350,537 |
(a) 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 WPL and WEPCO, respectively, who are the operators of those facilities. (b) 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. (c) MGE has a purchase power agreement to help meet future electric supply requirements. (d) Operational commitments for solar and wind facilities.
Other Commitments | MGE has several other commitments related to various projects. Payments for these commitments are expected to be as follows:
(In thousands) |  | 2026 |  |  | 2027 |  |  | 2028 |  |  | 2029 |  |  | 2030 |  |  | Thereafter |
Other commitments |  | $ | 333 |  |  | $ | 333 |  |  | $ | 333 |  |  | $ | 333 |  |  | $ | 333 |  |  | $ | 1,333 |

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- Definition Tabular disclosure of contractual obligation by timing of payment due. Includes, but is not limited to, long-term debt obligation, lease obligation, and purchase obligation. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name Regulation S-X (SX) -Number 210 -Section 12 -Subsection 04 -Subparagraph (a) -Publisher SEC Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 942 -SubTopic 235 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477314/942-235-S99-2 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480738/235-10-S50-4 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-04(a)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480678/235-10-S99-3 + Details
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