DERIVATIVE INSTRUMENTS - OFFSETTING ARRANGEMENTS (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Energy Related Derivative
Offsetting Derivative Assets [Abstract]
Gross amounts of recognized assets/liabilities	$ 117,529	$ 48,374
Gross amount offset in the balance sheet	0	0
Net amounts of assets/liabilities in balance sheet	117,529	48,374
Gross amounts not offset in the balance sheet, Financial Instruments	(57,804)	(24,027)
Gross amounts not offset in the balance sheet, Cash Collateral Posted	(32,782)	0
Net amount	26,943	24,347
Offsetting Derivative Liabilities [Abstract]
Gross amounts of recognized assets/liabilities	(76,081)	(31,953)
Gross amount offset in the balance sheet	0	0
Net amounts of assets/liabilities in balance sheet	(76,081)	(31,953)
Gross amounts not offset in the balance sheet, Financial Instruments	57,804	24,027
Gross amounts not offset in the balance sheet, Cash Collateral Posted	0	2,176
Net amount	(18,277)	(5,750)
Other Contract
Offsetting Derivative Liabilities [Abstract]
Gross amounts of recognized assets/liabilities	(8,000)	(9,938)
Gross amount offset in the balance sheet	0	0
Net amounts of assets/liabilities in balance sheet	(8,000)	(9,938)
Gross amounts not offset in the balance sheet, Financial Instruments	0	0
Gross amounts not offset in the balance sheet, Cash Collateral Posted	0	0
Net amount	(8,000)	(9,938)
South Jersey Gas Company | Energy Related Derivative
Offsetting Derivative Assets [Abstract]
Gross amounts of recognized assets/liabilities	9,903	4,140
Gross amount offset in the balance sheet	0	0
Net amounts of assets/liabilities in balance sheet	9,903	4,140
Gross amounts not offset in the balance sheet, Financial Instruments	(1,780)	(716)
Gross amounts not offset in the balance sheet, Cash Collateral Posted	0	0
Net amount	8,123	3,424
Offsetting Derivative Liabilities [Abstract]
Gross amounts of recognized assets/liabilities	(2,844)	(3,058)
Gross amount offset in the balance sheet	0	0
Net amounts of assets/liabilities in balance sheet	(2,844)	(3,058)
Gross amounts not offset in the balance sheet, Financial Instruments	1,780	716
Gross amounts not offset in the balance sheet, Cash Collateral Posted	0	2,176
Net amount	(1,064)	(166)
South Jersey Gas Company | Other Contract
Offsetting Derivative Liabilities [Abstract]
Gross amounts of recognized assets/liabilities	(8,000)	(9,938)
Gross amount offset in the balance sheet	0	0
Net amounts of assets/liabilities in balance sheet	(8,000)	(9,938)
Gross amounts not offset in the balance sheet, Financial Instruments	0	0
Gross amounts not offset in the balance sheet, Cash Collateral Posted	0	0
Net amount	$ (8,000)	$ (9,938)