FAIR VALUE OF FINANCIAL ASSETS AND FINANCIAL LIABILITIES (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2021 USD ($) $ / decatherm	Dec. 31, 2020 USD ($) $ / decatherm
Assets
Available-for-Sale Securities	$ 37	$ 32
Changes in significant unobservable inputs [Roll forward]
Balance at beginning of period	11,006	17,574
Other changes in fair value from continuing and new contracts, net	(228)	11,078
Settlements	(10,098)	(17,646)
Balance at end of period	680	11,006
Measurement at fair value on recurring basis
Assets
Available-for-Sale Securities	37	32
Derivatives - Energy Related Assets	117,529	48,374
Assets	117,566	48,406
Liabilities
Derivatives - Energy Related Liabilities	76,081	31,953
Derivatives - Other	8,000	9,938
Liabilities	84,081	41,891
Measurement at fair value on recurring basis | Level 1
Assets
Available-for-Sale Securities	37	32
Derivatives - Energy Related Assets	56,260	11,447
Assets	56,297	11,479
Liabilities
Derivatives - Energy Related Liabilities	21,879	8,605
Derivatives - Other	0	0
Liabilities	21,879	8,605
Measurement at fair value on recurring basis | Level 2
Assets
Available-for-Sale Securities	0	0
Derivatives - Energy Related Assets	52,277	23,527
Assets	52,277	23,527
Liabilities
Derivatives - Energy Related Liabilities	45,890	20,954
Derivatives - Other	8,000	9,938
Liabilities	53,890	30,892
Measurement at fair value on recurring basis | Level 3
Assets
Available-for-Sale Securities	0	0
Derivatives - Energy Related Assets	8,992	13,400
Assets	8,992	13,400
Liabilities
Derivatives - Energy Related Liabilities	8,312	2,394
Derivatives - Other	0	0
Liabilities	8,312	2,394
Natural Gas (in MMdts) | Level 3 | Forward Contract | Discounted Cash Flow
Liabilities
Assets	8,916	12,824
Liabilities	$ 8,107	$ 1,764
Natural Gas (in MMdts) | Level 3 | Forward Contract | Minimum | Discounted Cash Flow | Forward price (per dt)
Liabilities
Derivative, measurement input | $ / decatherm	1.77	1.44
Natural Gas (in MMdts) | Level 3 | Forward Contract | Maximum | Discounted Cash Flow | Forward price (per dt)
Liabilities
Derivative, measurement input | $ / decatherm	8.30	6.77
Natural Gas (in MMdts) | Level 3 | Forward Contract | Weighted Average | Discounted Cash Flow | Forward price (per dt)
Liabilities
Derivative, measurement input | $ / decatherm	3.73	2.67
South Jersey Gas Company
Changes in significant unobservable inputs [Roll forward]
Balance at beginning of period	$ 3,385	$ 5,035
Other changes in fair value from continuing and new contracts, net	3,638	3,385
Settlements	(3,385)	(5,035)
Balance at end of period	3,638	3,385
South Jersey Gas Company | Measurement at fair value on recurring basis
Assets
Derivatives - Energy Related Assets	9,903	4,140
Assets	9,903	4,140
Liabilities
Derivatives - Energy Related Liabilities	2,844	3,058
Derivatives - Other	8,000	9,938
Liabilities	10,844	12,996
South Jersey Gas Company | Measurement at fair value on recurring basis | Level 1
Assets
Derivatives - Energy Related Assets	4,648	715
Assets	4,648	715
Liabilities
Derivatives - Energy Related Liabilities	1,780	2,891
Derivatives - Other	0	0
Liabilities	1,780	2,891
South Jersey Gas Company | Measurement at fair value on recurring basis | Level 2
Assets
Derivatives - Energy Related Assets	1,617	32
Assets	1,617	32
Liabilities
Derivatives - Energy Related Liabilities	1,064	159
Derivatives - Other	8,000	9,938
Liabilities	9,064	10,097
South Jersey Gas Company | Measurement at fair value on recurring basis | Level 3
Assets
Derivatives - Energy Related Assets	3,638	3,393
Assets	3,638	3,393
Liabilities
Derivatives - Energy Related Liabilities	0	8
Derivatives - Other	0	0
Liabilities	0	8
South Jersey Gas Company | Natural Gas (in MMdts) | Level 3 | Forward Contract | Discounted Cash Flow
Liabilities
Assets	3,638	3,393
Liabilities	$ 0	$ 8
South Jersey Gas Company | Natural Gas (in MMdts) | Level 3 | Forward Contract | Minimum | Discounted Cash Flow | Forward price (per dt)
Liabilities
Derivative, measurement input | $ / decatherm	3.75	2.48
South Jersey Gas Company | Natural Gas (in MMdts) | Level 3 | Forward Contract | Maximum | Discounted Cash Flow | Forward price (per dt)
Liabilities
Derivative, measurement input | $ / decatherm	5.66	3.63
South Jersey Gas Company | Natural Gas (in MMdts) | Level 3 | Forward Contract | Weighted Average | Discounted Cash Flow | Forward price (per dt)
Liabilities
Derivative, measurement input | $ / decatherm	4.94	3.16