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Pension Plans and Other Postretirement Benefits (Details-1) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Defined Benefit Plan, Deferred Pension and Other Postretirement Benefit Plan Costs Recovered [Abstract] |  |  |  |
Defined Contribution Plan, Cost |  | $ 6,900 | $ 6,500 | $ 5,200
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |
Fair value of plan assets as of January 1 |  | 465,789 |  |
Fair value of plan assets as of December 31 |  | 505,260 | 465,789 |
Amounts recognized in the consolidated balance sheets to reflect funded status of plans [Abstract] |  |  |  |
Long-term asset |  | 164,985 | 132,264 |
Long-term liability |  | (51,105) | (50,155) |
Pension Benefits [Member] |  |  |  |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |  |
Net benefit obligation as of January 1 |  | 326,937 | 346,460 |
Service cost |  | 2,612 | 3,078 | 2,892
Interest cost |  | 17,139 | 17,118 | 17,319
Plan participants' contributions |  | 0 | 0 |
Actuarial loss (gain) | [1] | 11,028 | (16,669) |
Settlements | [2] | 0 | 0 |
Gross benefits paid |  | (22,239) | (23,050) |
Less: federal subsidy on benefits paid | [3] | 0 | 0 |
Benefit obligation as of December 31 |  | 335,477 | 326,937 | 346,460
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |
Fair value of plan assets as of January 1 |  | 424,468 | 404,735 |
Actual return in plan assets |  | 57,886 | 40,608 |
Employer contributions |  | 2,304 | 2,175 |
Plan participants' contributions |  | 0 | 0 |
Settlements |  | 0 | 0 |
Gross benefits paid |  | (22,239) | (23,050) |
Fair value of plan assets as of December 31 |  | 462,419 | 424,468 | 404,735
Funded Status as of December 31 |  | 126,942 | 97,531 |
Accumulated benefit obligation |  | 318,800 | 311,000 |
Amounts recognized in the consolidated balance sheets to reflect funded status of plans [Abstract] |  |  |  |
Long-term asset |  | 162,493 | 131,418 |
Current liability |  | (2,477) | (2,441) |
Long-term liability |  | (33,074) | (31,446) |
Net asset (liability) |  | 126,942 | 97,531 |
Amounts recognized in the consolidated balance sheets as regulatory asset [Abstract] |  |  |  |
Net actuarial loss (gain) |  | (14,444) | 3,699 |
Transition obligation |  | 0 | 0 |
Total |  | (14,444) | 3,699 |
Projected benefit obligation in excess of plan assets [Abstract] |  |  |  |
Projected benefit obligation with projected benefit obligation in excess of plan assets, end of year |  | 35,551 | 33,887 |
Fair value of plan assets with projected benefit obligation in excess of plan assets, end of year |  | 0 | 0 |
Accumulated benefit obligation in excess of plan assets [Abstract] |  |  |  |
Accumulated benefit obligation with accumulated benefit obligation in excess of plan assets, end of year |  | 33,553 | 32,463 |
Fair value of plan assets with accumulated benefit obligation in excess of plan assets, end of year |  | 0 | 0 |
Other Postretirement Benefits Plan [Member] |  |  |  |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |  |
Net benefit obligation as of January 1 |  | 59,184 | 64,973 |
Service cost |  | 743 | 856 | 780
Interest cost |  | 3,028 | 3,126 | 3,308
Plan participants' contributions |  | 1,081 | 1,045 |
Actuarial loss (gain) | [1] | 289 | (3,769) |
Settlements | [2] | 0 | (1,227) |
Gross benefits paid |  | (6,299) | (6,171) |
Less: federal subsidy on benefits paid | [3] | 354 | 351 |
Benefit obligation as of December 31 |  | 58,380 | 59,184 | 64,973
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |
Fair value of plan assets as of January 1 |  | 41,321 | 43,149 |
Actual return in plan assets |  | 5,999 | 4,131 |
Employer contributions |  | 739 | 682 |
Plan participants' contributions |  | 1,081 | 1,045 |
Settlements |  | 0 | (1,515) |
Gross benefits paid |  | (6,299) | (6,171) |
Fair value of plan assets as of December 31 |  | 42,841 | 41,321 | $ 43,149
Funded Status as of December 31 |  | (15,539) | (17,863) |
Medicare subsidy due to MGE |  | 300 | 300 |
Amounts recognized in the consolidated balance sheets to reflect funded status of plans [Abstract] |  |  |  |
Long-term asset |  | 2,492 | 846 |
Current liability |  | 0 | 0 |
Long-term liability |  | (18,031) | (18,709) |
Net asset (liability) |  | (15,539) | (17,863) |
Amounts recognized in the consolidated balance sheets as regulatory asset [Abstract] |  |  |  |
Net actuarial loss (gain) |  | (9,575) | (7,191) |
Transition obligation |  | 0 | 3 |
Total |  | (9,575) | (7,188) |
Accumulated benefit obligation in excess of plan assets [Abstract] |  |  |  |
Accumulated benefit obligation with accumulated benefit obligation in excess of plan assets, end of year |  | 44,007 | 43,882 |
Fair value of plan assets with accumulated benefit obligation in excess of plan assets, end of year |  | $ 25,976 | $ 25,172 |
[1] | Changes in discount rates were the primary driver of the actuarial loss (gain) in 2025 and 2024.
[2] | In August 2024, MGE entered into an agreement to transfer the mortality and investment risk, as well as the administration of, its employer-paid life insurance plan to a third party. MGE accounted for the settlement under the scope of ASC 715.
[3] | In 2003, the Medicare Prescription Drug, Improvement and Modernization Act of 2003 was signed into law authorizing Medicare to provide prescription drug benefits to retirees. For both the years ended December 31, 2025 and 2024, the subsidy due to MGE was $0.3 million.

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- Definition Amount of accumulated benefit obligation for defined benefit plan with accumulated benefit obligation in excess of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 17 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480482/715-20-55-17 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-3 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-3 + Details
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