PENSION AND OTHER POSTRETIREMENT BENEFITS (Details) - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
South Jersey Gas Company | Pricing dispute, long-term gas supply contract | Judicial Ruling
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Amount paid to third party supplier	$ 17,100,000	$ 1,600,000	$ 21,300,000
Pension Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Net periodic benefit cost	390,000	$ 2,212,000
Contributions	0
Pension Benefits | South Jersey Gas Company
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Net periodic benefit cost	$ 100,000
Weighted average expected long term rate of return on plan assets (as a percent)	7.25%	7.25%
Contributions		$ 0
Other Postretirement Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Net periodic benefit cost	$ (1,138,000)	(632,000)
Other Postretirement Benefits | South Jersey Gas Company
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Net periodic benefit cost	$ 1,100,000	$ 500,000
Weighted average expected long term rate of return on plan assets (as a percent)	6.75%	6.75%
Supplemental executive retirement plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Expected future employer contributions	$ 3,900,000