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Cover - USD ($)
 12 Months Ended
Dec. 31, 2022
Jan. 31, 2023
Jun. 30, 2022
Cover [Line Items]      
Entity Registrant Name MGE Energy, Inc.    
Entity Central Index Key 0001161728    
Document Type 10-K    
Document Period End Date Dec. 31, 2022    
Amendment Flag false    
Trading Symbol MGEE    
Document Fiscal Year Focus 2022    
Document Fiscal Period Focus FY    
Current Fiscal Year End Date --12-31    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Filer Category Large Accelerated Filer    
Entity Public Float     $ 2,808,969,657
Entity Common Stock, Shares Outstanding   36,163,370  
Entity Emerging Growth Company false    
Entity Small Business false    
ICFR Auditor Attestation Flag true    
Entity Shell Company false    
Entity Interactive Data Current Yes    
Security Exchange Name NASDAQ    
Security 12(b) Title Common Stock, $1 Par Value Per Share    
Entity Tax Identification Number 39-2040501    
Entity File Number 000-49965    
Entity Incorporation, State or Country Code WI    
Entity Address, Address Line One 133 South Blair Street    
Entity Address, City or Town Madison    
Entity Address, State or Province WI    
Entity Address, Postal Zip Code 53788    
City Area Code 608    
Local Phone Number 252-7000    
Document Transition Report false    
Document Annual Report true    
Documents Incorporated By Reference

DOCUMENTS INCORPORATED BY REFERENCE

 

Portions of MGE Energy, Inc.'s definitive proxy statement to be filed before April 30, 2023, relating to its annual meeting of shareholders, are incorporated by reference into Part III of this annual report on Form 10-K.

    
MGE [Member]      
Cover [Line Items]      
Entity Registrant Name Madison Gas and Electric Company    
Entity Central Index Key 0000061339    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Filer Category Non-accelerated Filer    
Entity Public Float     $ 0
Entity Common Stock, Shares Outstanding   17,347,894  
Entity Emerging Growth Company false    
Entity Small Business false    
Entity Shell Company false    
Entity Interactive Data Current Yes    
Entity Tax Identification Number 39-0444025    
Entity File Number 000-1125    
Entity Incorporation, State or Country Code WI    
Entity Address, Address Line One 133 South Blair Street    
Entity Address, City or Town Madison    
Entity Address, State or Province WI    
Entity Address, Postal Zip Code 53788    
City Area Code 608    
Local Phone Number 252-7000    
Document Transition Report false    
Document Annual Report true