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MGE Energy Inc Consolidated Statements of Common Equity (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
Total
Common Stock [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
AOCI Attributable to Parent [Member]
Beginning balance, shares at Dec. 31, 2021   36,163      
Beginning balance, value at Dec. 31, 2021 $ 1,027,468 $ 36,163 $ 394,903 $ 596,402 $ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net Income (Loss) 89,901     89,901  
Common stock dividends declared (42,763)     (42,763)  
Equity-based compensation plans and other 594   594    
Ending balance, shares at Sep. 30, 2022   36,163      
Ending balance, value at Sep. 30, 2022 1,075,200 $ 36,163 395,497 643,540 0
Beginning balance, shares at Jun. 30, 2022   36,163      
Beginning balance, value at Jun. 30, 2022 1,056,057 $ 36,163 395,338 624,556 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net Income (Loss) 33,720     33,720  
Common stock dividends declared (14,736)     (14,736)  
Equity-based compensation plans and other 159   159    
Ending balance, shares at Sep. 30, 2022   36,163      
Ending balance, value at Sep. 30, 2022 1,075,200 $ 36,163 395,497 643,540 0
Beginning balance, shares at Dec. 31, 2022   36,163      
Beginning balance, value at Dec. 31, 2022 1,081,674 $ 36,163 395,657 649,854 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net Income (Loss) 97,616     97,616  
Common stock dividends declared (44,933)     (44,933)  
Equity-based compensation plans and other 896   896    
Ending balance, shares at Sep. 30, 2023   36,163      
Ending balance, value at Sep. 30, 2023 1,135,253 $ 36,163 396,553 702,537 0
Beginning balance, shares at Jun. 30, 2023   36,163      
Beginning balance, value at Jun. 30, 2023 1,112,584 $ 36,163 396,281 680,140 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net Income (Loss) 37,857     37,857  
Common stock dividends declared (15,460)     (15,460)  
Equity-based compensation plans and other 272   272    
Ending balance, shares at Sep. 30, 2023   36,163      
Ending balance, value at Sep. 30, 2023 $ 1,135,253 $ 36,163 $ 396,553 $ 702,537 $ 0