RATES AND REGULATORY ACTIONS (Details) - USD ($) $ in Thousands			1 Months Ended
	May 06, 2021	Apr. 01, 2021	Apr. 30, 2021	Jan. 31, 2021	Mar. 31, 2021	Dec. 31, 2020
ETG Utility Operations
Schedule of Capitalization [Line Items]
Regulatory liability					$ 180,351	$ 175,217
SJG
Schedule of Capitalization [Line Items]
Regulatory liability					237,738	245,360
Public utilities, property, plant and equipment					2,815,113	$ 2,780,906
SJG | Pricing dispute, long-term gas supply contract | Settled Litigation | Subsequent Event
Schedule of Capitalization [Line Items]
Recovery of costs	$ 22,900
New Jersey Board of Public Utilities | ETG Utility Operations | Subsequent Event
Schedule of Capitalization [Line Items]
Approved rate increase (decrease)		$ (3,200)
Annual EET Rate Adjustment | SJG
Schedule of Capitalization [Line Items]
Approved rate increase (decrease)				$ 5,900
Annual Tax Act Rider | SJG | Protected Excess Deferred Income Tax
Schedule of Capitalization [Line Items]
Regulatory liability					$ 14,900
Societal Benefits Clause | New Jersey Board of Public Utilities | SJG | Subsequent Event
Schedule of Capitalization [Line Items]
Approved rate increase (decrease)			$ 5,500
Annual EEP Rate Adjustment | New Jersey Board of Public Utilities | SJG | Subsequent Event
Schedule of Capitalization [Line Items]
Requested revenue increase (decrease)			$ 5,400
Approved rate period			3 years
Public utilities, property, plant and equipment			$ 133,300
Annual EEP Rate Adjustment | New Jersey Board of Public Utilities | ETG Utility Operations | Subsequent Event
Schedule of Capitalization [Line Items]
Requested revenue increase (decrease)			2,800
Public utilities, property, plant and equipment			$ 83,400