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Schedule I - Condensed Parent Company Finanical Statements (Details-Cash Flow Statement) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Condensed Cash Flow Statements, Captions [Line Items] |  |  |
Cash provided by operating activities | $ 263,234 | $ 277,784 | $ 237,561
Investing Activities: |  |  |
Other | 2,155 | 230 | (954)
Cash used for investing activities | (350,561) | (241,487) | (230,020)
Financing Activities: |  |  |
Proceeds from Issuance of Common Stock | 3,750 | 31,605 | 0
Cash dividends paid on common stock | (67,587) | (63,596) | (60,393)
Other | (1,836) | (1,690) | (2,576)
Cash (Used for) Provided by Financing Activities | 71,567 | (26,827) | (10,483)
Change in cash, cash equivalents, and restricted cash: | (15,760) | 9,470 | (2,942)
Cash, cash equivalents, and restricted cash at beginning of period | 24,496 | 15,026 | 17,968
Cash, cash equivalents, and restricted cash at end of period | 8,736 | 24,496 | 15,026
MGE Energy [Member] |  |  |
Condensed Cash Flow Statements, Captions [Line Items] |  |  |
Cash provided by operating activities | 76,396 | 65,883 | 67,253
Investing Activities: |  |  |
Contributions to affiliates | (16,885) | (33,429) | (3,750)
Contributions to other Investments | (1,037) | (1,964) | (3,080)
Other | 4,466 | 329 | 987
Cash used for investing activities | (13,456) | (35,064) | (5,843)
Financing Activities: |  |  |
Proceeds from Issuance of Common Stock | 3,750 | 31,712 | 0
Cash dividends paid on common stock | (67,587) | (63,595) | (60,393)
Other | 0 | (94) | 0
Cash (Used for) Provided by Financing Activities | (63,837) | (31,977) | (60,393)
Change in cash, cash equivalents, and restricted cash: | (897) | (1,158) | 1,017
Cash, cash equivalents, and restricted cash at beginning of period | 3,195 | 4,353 | 3,336
Cash, cash equivalents, and restricted cash at end of period | $ 2,298 | $ 3,195 | $ 4,353

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