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REGULATION - REGULATORY FILINGS (Details) - USD ($)
$ in Thousands
3 Months Ended
Jan. 26, 2022
Nov. 19, 2021
Nov. 17, 2021
Dec. 31, 2021
Sep. 30, 2021
Schedule of Regulatory Filings [Line Items]          
Other noncurrent regulatory assets       $ 528,074 $ 522,099
Natural Gas Distribution          
Schedule of Regulatory Filings [Line Items]          
Other noncurrent regulatory assets       $ 10,700  
Base Rate Stipulation          
Schedule of Regulatory Filings [Line Items]          
Weighted average cost of capital       6.84%  
Approved return on equity       9.60%  
Approved equity capital structure, percentage       54.00%  
Public utilities, approved depreciation rate, percentage       2.78%  
BPU | Natural Gas Distribution          
Schedule of Regulatory Filings [Line Items]          
Requested rate increase (decrease), amount     $ 79,000    
SAFE II and NJ RISE          
Schedule of Regulatory Filings [Line Items]          
Approved rate increase (decrease), amount       $ 269  
BGSS | Natural Gas Distribution          
Schedule of Regulatory Filings [Line Items]          
Requested rate increase (decrease), amount     2,900    
BGSS | Natural Gas Distribution          
Schedule of Regulatory Filings [Line Items]          
Requested rate increase (decrease), amount   $ 24,200      
BGSS Balancing | Natural Gas Distribution          
Schedule of Regulatory Filings [Line Items]          
Requested rate increase (decrease), amount     13,000    
Conservation Incentive Program | Natural Gas Distribution          
Schedule of Regulatory Filings [Line Items]          
Requested rate increase (decrease), amount     $ (6,300)    
SAVEGREEN | Subsequent Event          
Schedule of Regulatory Filings [Line Items]          
Annual recovery increase $ 2,200