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Utility Regulatory Assets and Liabilities and Regulatory Matters - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Jan. 27, 2023
Nov. 16, 2022
Nov. 01, 2022
Sep. 15, 2022
Jul. 29, 2022
Jan. 28, 2022
Nov. 09, 2021
Feb. 08, 2021
Dec. 31, 2022
Dec. 31, 2021
Sep. 30, 2022
Dec. 01, 2022
Regulatory Assets                        
Net unrealized gains                 $ (1,402,000) $ (397,000)    
WVPSC                        
Regulatory Assets                        
Under-recovery of gas cost                       $ 12,000
Gas Utility                        
Regulatory Assets                        
Net unrealized gains                 $ (17,000) $ 2,000 $ 5,000  
Gas Utility | PAPUC                        
Regulatory Assets                        
Requested rate increase           $ 83,000            
Gas Utility | PAPUC | Joint Petition                        
Regulatory Assets                        
Requested rate increase       $ 49,000                
Approved rate     3.00%                  
Property, plant and equipment, net threshold     $ 3,368                  
Gas Utility | PAPUC | Beginning October 29, 2022                        
Regulatory Assets                        
Requested rate increase       38,000                
Gas Utility | PAPUC | Beginning October 1, 2023                        
Regulatory Assets                        
Requested rate increase       $ 11,000                
Gas Utility | PAPUC | Weather Normalization Adjustment Rider                        
Regulatory Assets                        
Rate period     5 years                  
Approved rate     3.00%                  
Utilities | PAPUC                        
Regulatory Assets                        
Requested rate increase               $ 9,000        
Approved rate increase             $ 6,000          
Utilities | PAPUC | Subsequent event                        
Regulatory Assets                        
Requested rate increase $ 11,000                      
Mountaineer | WVPSC | Over 2023 - 2027                        
Regulatory Assets                        
Requested rate increase         $ 354,000              
Mountaineer | WVPSC | Calendar Year 2023                        
Regulatory Assets                        
Requested rate increase         $ 64,000              
Mountaineer | WVPSC | 2023 IREP                        
Regulatory Assets                        
Requested rate increase   $ 22,000                    
Mountaineer | WVPSC | 2021 IREP                        
Regulatory Assets                        
Requested rate increase   $ 1,000