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v3.25.4

Schedule I - Condensed Parent Company Finanical Statements (Details-Notes 2) $ in Thousands | 12 Months Ended
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Dec. 31, 2025 USD ($) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($)
MGE Energy [Member] |  |  |
Dividends from Affiliates [Line Items] |  |  |
Cash dividends paid to parent by MGE | $ 75,194 | $ 65,990 | $ 67,112
First Mortgage Bonds [Member] | 7.70%, 2028 Series [Member] |  |  |
Dividend Restrictions |  |  |
Debt covenant, allowable amount available for payment of dividends | 807,200 |  |
MGE [Member] |  |  |
Dividends from Affiliates [Line Items] |  |  |
Cash dividends paid to parent by MGE | $ 51,500 | 34,500 | 41,000
Dividend Restrictions |  |  |
Common equity ratio | 0.58 |  |
MGE [Member] | Minimum [Member] |  |  |
Dividend Restrictions |  |  |
Dividend restrictions, common equity ratio | 0.55 |  |
MAGAEL [Member] |  |  |
Dividends from Affiliates [Line Items] |  |  |
Cash dividends paid to parent by MGE | $ 0 | 2,000 | 0
CWDC [Member] |  |  |
Dividends from Affiliates [Line Items] |  |  |
Cash dividends paid to parent by MGE | 0 | 2,000 | 0
MGE Power Elm Road [Member] |  |  |
Dividends from Affiliates [Line Items] |  |  |
Cash dividends paid to parent by MGE | 15,000 | 15,000 | 14,250
MGE Power West Campus [Member] |  |  |
Dividends from Affiliates [Line Items] |  |  |
Cash dividends paid to parent by MGE | 1,250 | 7,000 | 6,250
MGE Transco [Member] |  |  |
Dividends from Affiliates [Line Items] |  |  |
Cash dividends paid to parent by MGE | 7,157 | 5,230 | 5,533
MGEE Transco [Member] |  |  |
Dividends from Affiliates [Line Items] |  |  |
Cash dividends paid to parent by MGE | $ 287 | $ 260 | $ 79

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