Pay vs Performance Disclosure - USD ($)

12 Months Ended

Dec. 31, 2024

Dec. 31, 2023

Dec. 31, 2022

Dec. 31, 2021

Dec. 31, 2020

Pay vs Performance Disclosure

Pay vs Performance Disclosure, Table

Pay Versus Performance
					Value of Initial Fixed $100 Investment Based on:			Company Selected Measure
Year (a)	Summary Compensation Table Total for PEO ($)(1) (b)	Compensation Actually Paid to PEO ($)(2)(3) (c)	Average Summary Compensation Table Total for Non-PEO NEOs ($)(4) (d)	Average Compensation Actually Paid to Non-PEO NEOs ($)(2)(4)(5) (e)	Total Shareholder Return ($) (f)	Peer Group Total Shareholder Return ($)(6) (g)	Net Income ($) (h)	Earnings Per Share - Basic and Diluted ($)(7) (i)
2024	2,126,131	3,303,145	855,983	1,138,299	133	127	120,569,000	3.33
2023	2,566,797	2,206,732	895,191	838,196	100	107	117,699,000	3.25
2022	1,678,867	1,590,003	797,155	731,318	95	117	110,952,000	3.07
2021	2,628,028	2,189,827	863,501	766,775	109	116	105,761,000	2.92
2020	2,711,113	1,522,389	1,589,557	709,072	91	99	92,418,000	2.60

(1)Reflects amounts reported in the "Summary Compensation Table" for J. Keebler (PEO).

(2)Compensation Actually Paid (CAP) includes adjustments in accordance with the SEC methodology to the total executive compensation reported from the summary compensation table. The adjustments include a deduction for actuarial present value of accumulated benefit of all defined benefit and actuarial pension plans reported in the summary compensation table; addition of actuarially determined service costs for services rendered by the executive during the covered fiscal period, deduction of grant date fair value of equity award amounts reported in the summary compensation table; and addition or subtraction of the change in fair value of the equity awards unvested and vested during the fiscal period. The calculation of "compensation actually paid" is prescribed by SEC rules and does not represent the compensation actually received by the named executive officers for any time period shown above.

(3)To calculate CAP for the PEO, the following adjustments were made to the Summary Compensation Table total compensation, calculated in accordance with the SEC methodology for determining CAP for 2024:

Year	Deduction for Actuarial Pension Present Value	Addition for Service Cost for Pension	Deduction of Grant Date Fair Value of Awards Granted in FY	Addition of Fair Value of Equity Awards Granted in FY	Change in Fair Value of Prior Years’ Unvested Equity Awards	Change in Fair Value of Prior Years’ Awards Vested in FY	Total Adjustment to CAP
2024	—	161,310	(703,219)	1,168,032	204,985	345,906	1,177,014

(4)For fiscal years 2020 through 2024, J. Bushek, L. Hobbie, and C.A. Renlund are included as other named executive officers. In addition, J. Lorenz is included for fiscal year 2024; T. Johnson is included for fiscal years 2020 through 2023. D. Peterson is included for fiscal year 2021 and J. Newman is included for fiscal year 2020.

(5)To calculate CAP for the average named executive officers, the following average adjustments were made to Summary Compensation Table total compensation, calculated in accordance with the SEC methodology for determining CAP for 2024:

Year	Deduction for Actuarial Pension Present Value	Addition for Service Cost for Pension	Deduction of Grant Date Fair Value of Awards Granted in FY	Addition of Fair Value of Equity Awards Granted in FY	Change in Fair Value of Prior Years’ Unvested Equity Awards	Change in Fair Value of Prior Years’ Awards Vested in FY	Total Adjustment to CAP
2024	(17,440)	—	(196,853)	326,967	64,692	104,950	282,316

(6)Peer Group Total Shareholder Return of the Edison Electric Institute (EEI) Index companies, which is the index used for purposes of the Company’s disclosure under Item 201(e) of Regulation S-K.

(7)The Company determined that EPS is the most important financial performance measure used to link CAP to Company performance given that it is utilized as a component of the 2024 STI and the 2024 PSU awards granted to the NEOs.

Named Executive Officers, Footnote

(4)For fiscal years 2020 through 2024, J. Bushek, L. Hobbie, and C.A. Renlund are included as other named executive officers. In addition, J. Lorenz is included for fiscal year 2024; T. Johnson is included for fiscal years 2020 through 2023. D. Peterson is included for fiscal year 2021 and J. Newman is included for fiscal year 2020.

Peer Group Issuers, Footnote

Peer Group Total Shareholder Return of the Edison Electric Institute (EEI) Index companies, which is the index used for purposes of the Company’s disclosure under Item 201(e) of Regulation S-K

PEO Total Compensation Amount

^[1]

$ 2,126,131

$ 2,566,797

$ 1,678,867

$ 2,628,028

$ 2,711,113

PEO Actually Paid Compensation Amount

^[2],[3]

$ 3,303,145

2,206,732

1,590,003

2,189,827

1,522,389

Adjustment To PEO Compensation, Footnote

(3)To calculate CAP for the PEO, the following adjustments were made to the Summary Compensation Table total compensation, calculated in accordance with the SEC methodology for determining CAP for 2024:

Year	Deduction for Actuarial Pension Present Value	Addition for Service Cost for Pension	Deduction of Grant Date Fair Value of Awards Granted in FY	Addition of Fair Value of Equity Awards Granted in FY	Change in Fair Value of Prior Years’ Unvested Equity Awards	Change in Fair Value of Prior Years’ Awards Vested in FY	Total Adjustment to CAP
2024	—	161,310	(703,219)	1,168,032	204,985	345,906	1,177,014

Non-PEO NEO Average Total Compensation Amount

^[4]

$ 855,983

895,191

797,155

863,501

1,589,557

Non-PEO NEO Average Compensation Actually Paid Amount

^[2],[4],[5]

$ 1,138,299

838,196

731,318

766,775

709,072

Adjustment to Non-PEO NEO Compensation Footnote

(5)To calculate CAP for the average named executive officers, the following average adjustments were made to Summary Compensation Table total compensation, calculated in accordance with the SEC methodology for determining CAP for 2024:

Year	Deduction for Actuarial Pension Present Value	Addition for Service Cost for Pension	Deduction of Grant Date Fair Value of Awards Granted in FY	Addition of Fair Value of Equity Awards Granted in FY	Change in Fair Value of Prior Years’ Unvested Equity Awards	Change in Fair Value of Prior Years’ Awards Vested in FY	Total Adjustment to CAP
2024	(17,440)	—	(196,853)	326,967	64,692	104,950	282,316

Compensation Actually Paid vs. Net Income

The chart below illustrates the relationship of executive compensation actually paid and Net Income.

Compensation Actually Paid vs. Company Selected Measure

The chart below illustrates the relationship of executive compensation actually paid and Earnings Per Share (EPS).

Total Shareholder Return Vs Peer Group

The chart below illustrates the relationship of executive compensation actually paid and MGE Energy Total Shareholder Return (TSR). Also included is the relationship of MGE Energy TSR and peer group TSR.

Tabular List, Table

The following table identifies the financial and non-financial most important performance measures used by our Human Resources and Compensation Committee to link compensation actually paid to our NEOs to Company performance. See further discussion in the Compensation Discussion and Analysis for description of metrics and impact to executive compensation.

Performance Measures

Earnings Per Share

Return on Equity

Relative Total Shareholder Return

Customer Satisfaction Rating

Service Reliability

Total Shareholder Return Amount

$ 133

100

95

109

91

Peer Group Total Shareholder Return Amount

^[6]

127

107

117

116

99

Net Income (Loss)

$ 120,569,000

$ 117,699,000

$ 110,952,000

$ 105,761,000

$ 92,418,000

Company Selected Measure Amount

^[7]

3.33

3.25

3.07

2.92

2.6

PEO Name

J. Keebler (PEO)

Measure:: 1

Pay vs Performance Disclosure

Name

Earnings Per Share

Measure:: 2

Pay vs Performance Disclosure

Name

Return on Equity

Measure:: 3

Pay vs Performance Disclosure

Name

Relative Total Shareholder Return

Measure:: 4

Pay vs Performance Disclosure

Name

Customer Satisfaction Rating

Measure:: 5

Pay vs Performance Disclosure

Name

Service Reliability

PEO

Pay vs Performance Disclosure

Adjustment to Compensation, Amount

$ 1,177,014

PEO | Deduction for Actuarial Pension Present Value [Member]

Pay vs Performance Disclosure

Adjustment to Compensation, Amount

0

PEO | Addition for Service Cost for Pension [Member]

Pay vs Performance Disclosure

Adjustment to Compensation, Amount

161,310

PEO | Deduction Grant Date Fair Value of Awards Granted in FY [Member]

Pay vs Performance Disclosure

Adjustment to Compensation, Amount

(703,219)

PEO | Addition of Fair Value of Equity Awards Granted in FY [Member]

Pay vs Performance Disclosure

Adjustment to Compensation, Amount

1,168,032

PEO | Change in Fair Value of Prior Years Unvested Equity Awards [Member]

Pay vs Performance Disclosure

Adjustment to Compensation, Amount

204,985

PEO | Change in Fair Value of Prior Years Awards Vested in FY [Member]

Pay vs Performance Disclosure

Adjustment to Compensation, Amount

345,906

Non-PEO NEO

Pay vs Performance Disclosure

Adjustment to Compensation, Amount

282,316

Non-PEO NEO | Deduction for Actuarial Pension Present Value [Member]

Pay vs Performance Disclosure

Adjustment to Compensation, Amount

(17,440)

Non-PEO NEO | Addition for Service Cost for Pension [Member]

Pay vs Performance Disclosure

Adjustment to Compensation, Amount

0

Non-PEO NEO | Deduction Grant Date Fair Value of Awards Granted in FY [Member]

Pay vs Performance Disclosure

Adjustment to Compensation, Amount

(196,853)

Non-PEO NEO | Addition of Fair Value of Equity Awards Granted in FY [Member]

Pay vs Performance Disclosure

Adjustment to Compensation, Amount

326,967

Non-PEO NEO | Change in Fair Value of Prior Years Unvested Equity Awards [Member]

Pay vs Performance Disclosure

Adjustment to Compensation, Amount

64,692

Non-PEO NEO | Change in Fair Value of Prior Years Awards Vested in FY [Member]

Pay vs Performance Disclosure

Adjustment to Compensation, Amount

$ 104,950

[1] Reflects amounts reported in the "Summary Compensation Table" for J. Keebler (PEO).

[2] Compensation Actually Paid (CAP) includes adjustments in accordance with the SEC methodology to the total executive compensation reported from the summary compensation table. The adjustments include a deduction for actuarial present value of accumulated benefit of all defined benefit and actuarial pension plans reported in the summary compensation table; addition of actuarially determined service costs for services rendered by the executive during the covered fiscal period, deduction of grant date fair value of equity award amounts reported in the summary compensation table; and addition or subtraction of the change in fair value of the equity awards unvested and vested during the fiscal period. The calculation of "compensation actually paid" is prescribed by SEC rules and does not represent the compensation actually received by the named executive officers for any time period shown above.

[3] To calculate CAP for the PEO, the following adjustments were made to the Summary Compensation Table total compensation, calculated in accordance with the SEC methodology for determining CAP for 2024:   Year Deduction for Actuarial Pension Present Value Addition for Service Cost for Pension Deduction of Grant Date Fair Value of Awards Granted in FY Addition of Fair Value of Equity Awards Granted in FY Change in Fair Value of Prior Years’ Unvested Equity Awards Change in Fair Value of Prior Years’ Awards Vested in FY Total Adjustment to CAP 2024 — 161,310 (703,219) 1,168,032 204,985 345,906 1,177,014  

[4] For fiscal years 2020 through 2024, J. Bushek, L. Hobbie, and C.A. Renlund are included as other named executive officers. In addition, J. Lorenz is included for fiscal year 2024; T. Johnson is included for fiscal years 2020 through 2023. D. Peterson is included for fiscal year 2021 and J. Newman is included for fiscal year 2020.

[5] To calculate CAP for the average named executive officers, the following average adjustments were made to Summary Compensation Table total compensation, calculated in accordance with the SEC methodology for determining CAP for 2024:   Year Deduction for Actuarial Pension Present Value Addition for Service Cost for Pension Deduction of Grant Date Fair Value of Awards Granted in FY Addition of Fair Value of Equity Awards Granted in FY Change in Fair Value of Prior Years’ Unvested Equity Awards Change in Fair Value of Prior Years’ Awards Vested in FY Total Adjustment to CAP 2024 (17,440) — (196,853) 326,967 64,692 104,950 282,316

[6] Peer Group Total Shareholder Return of the Edison Electric Institute (EEI) Index companies, which is the index used for purposes of the Company’s disclosure under Item 201(e) of Regulation S-K.

[7] The Company determined that EPS is the most important financial performance measure used to link CAP to Company performance given that it is utilized as a component of the 2024 STI and the 2024 PSU awards granted to the NEOs.