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Consolidated Statements of Equity - USD ($)
$ in Thousands
Total
Common Stock
Other Paid-in Capital
Retained Earnings
Accumulated Other Comprehensive Loss
Beginning balance (in shares) at Dec. 31, 2022   1,000      
Beginning balance at Dec. 31, 2022 $ 382,247 $ 1 $ 136,327 $ 245,954 $ (35)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 137,230     137,230  
Other comprehensive income 35       35
Net transfers (to) from CEHI, LLC and/or MDU Resources Group, Inc. (70,662)   (143) (70,519)  
Ending balance (in shares) at Dec. 31, 2023   1,000      
Ending balance at Dec. 31, 2023 448,850 $ 1 136,184 312,665 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 143,421     143,421  
Other comprehensive income 0        
Stock-based compensation (in shares)   8,865      
Stock-based compensation 1,472   2,047 (575)  
Retirement of historical common stock in connection with the Separation (in shares)   (1,000)      
Retirement of historical common stock in connection with the Separation 0 $ (1) 1    
Issuance of common stock in connection with the Separation (in shares)   50,972,059      
Issuance of common stock in connection with the Separation 0 $ 510 (510)    
Net transfers (to) from CEHI, LLC and/or MDU Resources Group, Inc. $ (171,131)   408 (171,539)  
Ending balance (in shares) at Dec. 31, 2024 50,980,924 50,980,924      
Ending balance at Dec. 31, 2024 $ 422,612 $ 510 138,130 283,972 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 201,770     201,770  
Other comprehensive income 0        
Stock-based compensation (in shares)   25,795      
Stock-based compensation $ 5,436   5,436    
Ending balance (in shares) at Dec. 31, 2025 51,006,719 51,006,719      
Ending balance at Dec. 31, 2025 $ 629,818 $ 510 $ 143,566 $ 485,742 $ 0