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REVENUES - Disaggregated Revenue (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disaggregation of Revenue [Line Items]      
Utility $ 2,318,830 $ 1,560,083 $ 1,552,547
Gas      
Disaggregation of Revenue [Line Items]      
Utility 2,279,698 1,522,816 1,452,183
Electric      
Disaggregation of Revenue [Line Items]      
Utility 8,741 17,936 48,964
Solar      
Disaggregation of Revenue [Line Items]      
Utility 7,019 8,426 15,111
Fuel Cells      
Disaggregation of Revenue [Line Items]      
Utility 15,763 3,502 27,993
Other      
Disaggregation of Revenue [Line Items]      
Utility 7,609 7,403 8,296
Residential      
Disaggregation of Revenue [Line Items]      
Utility 587,169 576,489 593,541
Commercial & Industrial      
Disaggregation of Revenue [Line Items]      
Utility 1,712,751 972,041 937,191
OSS & Capacity Release      
Disaggregation of Revenue [Line Items]      
Utility 10,720 7,673 8,951
Other      
Disaggregation of Revenue [Line Items]      
Utility 8,190 3,880 12,864
SJG Utility Operations | Operating Segments      
Disaggregation of Revenue [Line Items]      
Utility 539,992 503,132 485,012
SJG Utility Operations | Gas | Operating Segments      
Disaggregation of Revenue [Line Items]      
Utility 539,992 503,132 485,012
SJG Utility Operations | Residential | Operating Segments      
Disaggregation of Revenue [Line Items]      
Utility 359,963 349,111 356,646
SJG Utility Operations | Commercial & Industrial | Operating Segments      
Disaggregation of Revenue [Line Items]      
Utility 166,287 144,300 116,959
SJG Utility Operations | OSS & Capacity Release | Operating Segments      
Disaggregation of Revenue [Line Items]      
Utility 10,720 7,673 8,951
SJG Utility Operations | Other | Operating Segments      
Disaggregation of Revenue [Line Items]      
Utility 3,022 2,048 2,456
ETG Utility Operations | Operating Segments      
Disaggregation of Revenue [Line Items]      
Utility 355,168 339,150 331,027
ETG Utility Operations | Gas | Operating Segments      
Disaggregation of Revenue [Line Items]      
Utility 355,168 339,150 331,027
ETG Utility Operations | Residential | Operating Segments      
Disaggregation of Revenue [Line Items]      
Utility 225,209 223,221 217,195
ETG Utility Operations | Commercial & Industrial | Operating Segments      
Disaggregation of Revenue [Line Items]      
Utility 129,148 114,300 103,590
ETG Utility Operations | Other | Operating Segments      
Disaggregation of Revenue [Line Items]      
Utility 811 1,629 10,242
ELK Utility Operations | Operating Segments      
Disaggregation of Revenue [Line Items]      
Utility   4,926 7,857
ELK Utility Operations | Gas | Operating Segments      
Disaggregation of Revenue [Line Items]      
Utility   4,926 7,857
ELK Utility Operations | Residential | Operating Segments      
Disaggregation of Revenue [Line Items]      
Utility   2,179 3,494
ELK Utility Operations | Commercial & Industrial | Operating Segments      
Disaggregation of Revenue [Line Items]      
Utility   2,544 4,197
ELK Utility Operations | Other | Operating Segments      
Disaggregation of Revenue [Line Items]      
Utility   203 166
Wholesale Energy Operations | Operating Segments      
Disaggregation of Revenue [Line Items]      
Utility 1,406,155 683,152 633,720
Wholesale Energy Operations | Gas | Operating Segments      
Disaggregation of Revenue [Line Items]      
Utility 1,406,155 683,152 633,720
Wholesale Energy Operations | Commercial & Industrial | Operating Segments      
Disaggregation of Revenue [Line Items]      
Utility 1,406,155 683,152 633,720
Retail Services | Operating Segments      
Disaggregation of Revenue [Line Items]      
Utility 15,796 24,154 59,551
Retail Services | Electric | Operating Segments      
Disaggregation of Revenue [Line Items]      
Utility 8,919 19,907 56,899
Retail Services | Other | Operating Segments      
Disaggregation of Revenue [Line Items]      
Utility 6,877 4,247 2,652
Retail Services | Residential | Operating Segments      
Disaggregation of Revenue [Line Items]      
Utility 1,997 1,978 16,206
Retail Services | Commercial & Industrial | Operating Segments      
Disaggregation of Revenue [Line Items]      
Utility 8,918 22,176 43,345
Retail Services | Other | Operating Segments      
Disaggregation of Revenue [Line Items]      
Utility 4,881    
Renewables | Operating Segments      
Disaggregation of Revenue [Line Items]      
Utility 24,038 15,617 48,748
Renewables | Solar | Operating Segments      
Disaggregation of Revenue [Line Items]      
Utility 7,019 8,426 15,111
Renewables | Fuel Cells | Operating Segments      
Disaggregation of Revenue [Line Items]      
Utility 15,763 3,502 27,993
Renewables | Other | Operating Segments      
Disaggregation of Revenue [Line Items]      
Utility 1,256 3,689 5,644
Renewables | Commercial & Industrial | Operating Segments      
Disaggregation of Revenue [Line Items]      
Utility 24,038 15,617 48,748
Corporate & Services | Intersegment      
Disaggregation of Revenue [Line Items]      
Utility (22,319) (10,048) (13,368)
Corporate & Services | Gas | Intersegment      
Disaggregation of Revenue [Line Items]      
Utility (21,617) (7,544) (5,433)
Corporate & Services | Electric | Intersegment      
Disaggregation of Revenue [Line Items]      
Utility (178) (1,971) (7,935)
Corporate & Services | Solar | Intersegment      
Disaggregation of Revenue [Line Items]      
Utility     0
Corporate & Services | Other | Intersegment      
Disaggregation of Revenue [Line Items]      
Utility (524) (533) 0
Corporate & Services | Commercial & Industrial | Intersegment      
Disaggregation of Revenue [Line Items]      
Utility (21,795) $ (10,048) $ (13,368)
Corporate & Services | Other | Intersegment      
Disaggregation of Revenue [Line Items]      
Utility $ (524)