PENSION AND OTHER POSTRETIREMENT BENEFITS - Narrative (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Pension Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Net periodic benefit cost (credit)	$ 1,217,000	$ 2,119,000	$ 1,997,000	$ 6,542,000
Contributions			0
Other Postretirement Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Net periodic benefit cost (credit)	(1,175,000)	(632,000)	(3,451,000)	(1,897,000)
Supplemental Executive Retirement Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Expected future employer contributions	3,900,000		3,900,000
South Jersey Gas Company | Pension Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Net periodic benefit cost (credit)	$ 400,000	$ 1,600,000	$ 600,000	$ 4,700,000
Weighted average expected long term rate of return on plan assets (as a percent)	7.25%	7.25%	7.25%	7.25%
Contributions				$ 0
South Jersey Gas Company | Other Postretirement Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Net periodic benefit cost (credit)	$ (600,000)	$ (600,000)	$ (2,800,000)	$ (1,600,000)
Weighted average expected long term rate of return on plan assets (as a percent)	6.75%	6.75%	6.75%	6.75%