REGULATORY ASSETS AND REGULATORY LIABILITIES - Regulatory Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
ETG Utility Operations
Regulatory Assets [Line Items]
Total Regulatory Assets	$ 197,594	$ 189,671
ETG Utility Operations | Environmental Remediation Costs: Expended - Net
Regulatory Assets [Line Items]
Total Regulatory Assets	21,047	13,972
ETG Utility Operations | Liability for Future Expenditures
Regulatory Assets [Line Items]
Total Regulatory Assets	75,133	77,830
ETG Utility Operations | Deferred ARO Costs
Regulatory Assets [Line Items]
Total Regulatory Assets	37,022	33,872
ETG Utility Operations | Deferred Pension and Other Postretirement Benefit Costs - Unrecognized Prior Service Cost
Regulatory Assets [Line Items]
Total Regulatory Assets	29,250	30,881
ETG Utility Operations | Deferred Pension and Other Postretirement Benefit Costs
Regulatory Assets [Line Items]
Total Regulatory Assets	813	813
ETG Utility Operations | Deferred Gas Costs - Net
Regulatory Assets [Line Items]
Total Regulatory Assets	0	0
ETG Utility Operations | CIP Receivable
Regulatory Assets [Line Items]
Total Regulatory Assets	2,120	2,955
ETG Utility Operations | SBC Receivable (excluding RAC)
Regulatory Assets [Line Items]
Total Regulatory Assets	295	0
ETG Utility Operations | Deferred Interest Rate Contracts
Regulatory Assets [Line Items]
Total Regulatory Assets	0	0
ETG Utility Operations | EET/EEP
Regulatory Assets [Line Items]
Total Regulatory Assets	6,538	5,199
ETG Utility Operations | AFUDC - Equity Related Deferrals
Regulatory Assets [Line Items]
Total Regulatory Assets	0	0
ETG Utility Operations | WNC
Regulatory Assets [Line Items]
Total Regulatory Assets	64	4,269
ETG Utility Operations | Deferred COVID-19 Costs
Regulatory Assets [Line Items]
Total Regulatory Assets	15,755	10,225
ETG Utility Operations | Other Regulatory Assets
Regulatory Assets [Line Items]
Total Regulatory Assets	9,557	9,655
South Jersey Gas Company
Regulatory Assets [Line Items]
Total Regulatory Assets	445,420	482,745
South Jersey Gas Company | Environmental Remediation Costs: Expended - Net
Regulatory Assets [Line Items]
Total Regulatory Assets	156,967	151,630
South Jersey Gas Company | Liability for Future Expenditures
Regulatory Assets [Line Items]
Total Regulatory Assets	89,051	97,964
South Jersey Gas Company | Deferred ARO Costs
Regulatory Assets [Line Items]
Total Regulatory Assets	50,848	47,784
South Jersey Gas Company | Deferred Pension and Other Postretirement Benefit Costs - Unrecognized Prior Service Cost
Regulatory Assets [Line Items]
Total Regulatory Assets	0	0
South Jersey Gas Company | Deferred Pension and Other Postretirement Benefit Costs
Regulatory Assets [Line Items]
Total Regulatory Assets	47,504	47,504
South Jersey Gas Company | Deferred Gas Costs - Net
Regulatory Assets [Line Items]
Total Regulatory Assets	10,870	38,234
South Jersey Gas Company | CIP Receivable
Regulatory Assets [Line Items]
Total Regulatory Assets	12,806	17,776
South Jersey Gas Company | SBC Receivable (excluding RAC)
Regulatory Assets [Line Items]
Total Regulatory Assets	7,351	7,519
South Jersey Gas Company | Deferred Interest Rate Contracts
Regulatory Assets [Line Items]
Total Regulatory Assets	4,351	8,002
South Jersey Gas Company | EET/EEP
Regulatory Assets [Line Items]
Total Regulatory Assets	20,064	20,632
South Jersey Gas Company | AFUDC - Equity Related Deferrals
Regulatory Assets [Line Items]
Total Regulatory Assets	12,571	12,199
South Jersey Gas Company | WNC
Regulatory Assets [Line Items]
Total Regulatory Assets	0	0
South Jersey Gas Company | Deferred COVID-19 Costs
Regulatory Assets [Line Items]
Total Regulatory Assets	9,361	7,687
South Jersey Gas Company | Other Regulatory Assets
Regulatory Assets [Line Items]
Total Regulatory Assets	23,676	25,814
SJI
Regulatory Assets [Line Items]
Total Regulatory Assets	643,014	672,416
SJI | Environmental Remediation Costs: Expended - Net
Regulatory Assets [Line Items]
Total Regulatory Assets	178,014	165,602
SJI | Liability for Future Expenditures
Regulatory Assets [Line Items]
Total Regulatory Assets	164,184	175,794
SJI | Deferred ARO Costs
Regulatory Assets [Line Items]
Total Regulatory Assets	87,870	81,656
SJI | Deferred Pension and Other Postretirement Benefit Costs - Unrecognized Prior Service Cost
Regulatory Assets [Line Items]
Total Regulatory Assets	29,250	30,881
SJI | Deferred Pension and Other Postretirement Benefit Costs
Regulatory Assets [Line Items]
Total Regulatory Assets	48,317	48,317
SJI | Deferred Gas Costs - Net
Regulatory Assets [Line Items]
Total Regulatory Assets	10,870	38,234
SJI | CIP Receivable
Regulatory Assets [Line Items]
Total Regulatory Assets	14,926	20,731
SJI | SBC Receivable (excluding RAC)
Regulatory Assets [Line Items]
Total Regulatory Assets	7,646	7,519
SJI | Deferred Interest Rate Contracts
Regulatory Assets [Line Items]
Total Regulatory Assets	4,351	8,002
SJI | EET/EEP
Regulatory Assets [Line Items]
Total Regulatory Assets	26,602	25,831
SJI | AFUDC - Equity Related Deferrals
Regulatory Assets [Line Items]
Total Regulatory Assets	12,571	12,199
SJI | WNC
Regulatory Assets [Line Items]
Total Regulatory Assets	64	4,269
SJI | Deferred COVID-19 Costs
Regulatory Assets [Line Items]
Total Regulatory Assets	25,116	17,912
SJI | Other Regulatory Assets
Regulatory Assets [Line Items]
Total Regulatory Assets	$ 33,233	$ 35,469