PENSION AND OTHER POSTRETIREMENT BENEFITS - CONTRIBUTIONS (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plan, Expected Future Benefit Payment [Abstract]
Employer contributions	$ 5,400,000	$ 0	$ 0
Pension Benefits
Defined Benefit Plan, Expected Future Benefit Payment [Abstract]
2022	22,834,000
2023	23,550,000
2024	23,795,000
2025	24,008,000
2026	24,618,000
2027 - 2031	130,850,000
Employer contributions	9,287,000	3,875,000
Other Postretirement Benefits
Defined Benefit Plan, Expected Future Benefit Payment [Abstract]
2022	5,451,000
2023	5,271,000
2024	4,932,000
2025	4,696,000
2026	4,448,000
2027 - 2031	18,642,000
Employer contributions	4,309,000	4,347,000
Supplemental Employee Retirement Plan
Defined Benefit Plan, Expected Future Benefit Payment [Abstract]
Employer contributions	3,900,000	3,900,000	4,100,000
Expected contribution to plan	3,900,000
South Jersey Gas Company
Defined Benefit Plan, Expected Future Benefit Payment [Abstract]
Employer contributions	5,000,000	0	$ 0
South Jersey Gas Company | Pension Benefits
Defined Benefit Plan, Expected Future Benefit Payment [Abstract]
2022	14,143,000
2023	14,658,000
2024	15,022,000
2025	15,398,000
2026	15,792,000
2027 - 2031	86,896,000
Employer contributions	8,862,000	3,840,000
South Jersey Gas Company | Other Postretirement Benefits
Defined Benefit Plan, Expected Future Benefit Payment [Abstract]
2022	3,591,000
2023	3,500,000
2024	3,285,000
2025	3,100,000
2026	2,926,000
2027 - 2031	11,931,000
Employer contributions	$ 3,496,000	$ 2,373,000