DERIVATIVE INSTRUMENTS - Effect of Instruments (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Derivatives not designated as hedging instruments under GAAP
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Losses on energy-related commodity contracts	$ (33,900)	$ (15,200)	$ (55,200)	$ (15,300)
Interest rate contracts | Non-Utility Revenue
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Losses reclassified from AOCL into income	(12)	(12)	(25)	(24)
Interest rate contracts | Non-Utility Revenue | South Jersey Gas Company
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Losses reclassified from AOCL into income	(12)	(12)	(25)	(24)
Energy-related commodity contracts | Derivatives not designated as hedging instruments under GAAP
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Losses on energy-related commodity contracts	$ (33,922)	$ (15,230)	$ (55,191)	$ (15,274)