v3.26.1
MGE Energy Inc Consolidated Statements of Common Equity (Unaudited) - USD ($)
$ in Thousands
Total
Common Stock [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
AOCI Attributable to Parent [Member]
Beginning balance, value at Dec. 31, 2024 $ 1,230,138 $ 36,490 $ 429,515 $ 764,133 $ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net Income (Loss) 41,592     41,592  
Common stock dividends declared $ (16,428)     (16,428)  
Stock Issued During Period, Shares, Dividend Reinvestment Plan 35,774        
Issuance of common stock, net $ 3,279 36 3,243    
Equity-based compensation plans and other 332 11 321    
Ending balance, value at Mar. 31, 2025 1,258,913 36,537 433,079 789,297 0
Beginning balance, value at Dec. 31, 2025 1,303,936 36,542 434,959 832,435 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net Income (Loss) 48,481     48,481  
Common stock dividends declared $ (17,368)     (17,368)  
Stock Issued During Period, Shares, Dividend Reinvestment Plan 34,988        
Issuance of common stock, net $ 14,014 189 13,825    
Equity-based compensation plans and other 336 22 314    
Ending balance, value at Mar. 31, 2026 $ 1,349,399 $ 36,753 $ 449,098 $ 863,548 $ 0