RATES AND REGULATORY ACTIONS (Details) $ in Thousands		1 Months Ended																														3 Months Ended	12 Months Ended
	Dec. 01, 2021 USD ($)	Feb. 28, 2022 USD ($)	Feb. 24, 2022 USD ($)	Dec. 31, 2021 USD ($) decatherm site	Nov. 30, 2021 USD ($)	Sep. 30, 2021 USD ($)	Jul. 31, 2021 USD ($)	Jun. 30, 2021 USD ($)	Apr. 30, 2021 USD ($)	Mar. 31, 2021 USD ($)	Jan. 31, 2021 USD ($)	Nov. 30, 2020 USD ($)	Sep. 30, 2020 USD ($)	Jul. 31, 2020 USD ($)	Jun. 30, 2020 USD ($)	May 31, 2020 USD ($)	Apr. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Jan. 31, 2020 USD ($)	Nov. 30, 2019 USD ($)	Sep. 30, 2019 USD ($)	Jul. 31, 2019 USD ($)	Jun. 30, 2019 USD ($)	May 31, 2019 USD ($)	Apr. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Jan. 31, 2019 USD ($)	Oct. 31, 2018 USD ($)	Sep. 30, 2018 USD ($)	May 31, 2018 USD ($)	Oct. 31, 2016 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2021 USD ($) decatherm site	Dec. 31, 2020 USD ($)	Feb. 29, 2020 USD ($)	Dec. 31, 2019 USD ($)
Schedule of Capitalization [Line Items]
Net Utility Plant				$ 4,707,186																													$ 4,707,186	$ 4,351,539
Public utilities, funding level								$ 344,700
Number of customers purchasing energy commodity from another entity | decatherm				19,793																													19,793
Minimum
Schedule of Capitalization [Line Items]
Public utilities budget				$ 45,600																													$ 45,600
Maximum
Schedule of Capitalization [Line Items]
Public utilities budget				80,300																													80,300
ERIP
Schedule of Capitalization [Line Items]
ERIP costs capitalized													$ 5,100
South Jersey Gas Company
Schedule of Capitalization [Line Items]
Approved rate increase (decrease)																													$ (25,900)
Net Utility Plant				2,956,531																													2,956,531	2,780,906
Recovery period (in years)																														3 years
Investment amount of SHARP																														$ 100,300
Regulatory assets				482,745																													482,745	495,084
Regulatory liabilities				222,411																													222,411	245,360
South Jersey Gas Company | Other Regulatory Assets
Schedule of Capitalization [Line Items]
Regulatory assets				25,814																													25,814	27,844
South Jersey Gas Company | Annual BGSS Filing
Schedule of Capitalization [Line Items]
Approved rate increase (decrease)	$ (56,600)				$ (36,200)								$ (59,400)
Litigation settlement, recovery term (in years)													2 years
South Jersey Gas Company | Annual BGSS Filing | Pricing dispute, long-term gas supply contract | Settled Litigation
Schedule of Capitalization [Line Items]
Amount paid to third party supplier													$ 22,900
South Jersey Gas Company | Annual CIP Filing
Schedule of Capitalization [Line Items]
Approved rate increase (decrease)					$ 15,300								27,400
South Jersey Gas Company | New Jersey Board of Public Utilities
Schedule of Capitalization [Line Items]
Approved rate increase (decrease)									$ 5,400				$ 39,500															$ 3,500
Approved rate of return on rate base, percentage													6.90%
Approved return on common equity, percentage													9.60%
Approved common equity component, percentage													54.00%
Regulatory liability, amortization period													5 years
New program, term (in years)									3 years																			3 years
Public utilities budget									$ 133,300																			$ 81,300
Program investment recovery amortization period									10 years																			7 years
South Jersey Gas Company | New Jersey Board of Public Utilities | Other Regulatory Assets
Schedule of Capitalization [Line Items]
Increase (decrease) in regulatory assets													$ 10,100
South Jersey Gas Company | New Jersey Board of Public Utilities | Annual BGSS Filing
Schedule of Capitalization [Line Items]
Approved rate increase (decrease)																					$ (27,600)
Monthly bill adjustment basis (as a percent)					5.00%
South Jersey Gas Company | New Jersey Board of Public Utilities | AIRP II Investments
Schedule of Capitalization [Line Items]
New program, term (in years)																															5 years
Authorized replacement investments (up to)																															$ 302,500
Net Utility Plant				69,000									58,800																				69,000
South Jersey Gas Company | New Jersey Board of Public Utilities | SHARP II Investments
Schedule of Capitalization [Line Items]
Net Utility Plant						$ 22,800							33,300												$ 28,300
Investment to be recovered by Sharp II																					27,400
South Jersey Gas Company | New Jersey Board of Public Utilities | Annual SBC Filing
Schedule of Capitalization [Line Items]
Approved rate increase (decrease)									$ 5,100									$ 3,900
Requested rate increase (decrease), amount							$ 900
Stipulation of Settlement | South Jersey Gas Company | Protected Excess Deferred Income Tax
Schedule of Capitalization [Line Items]
Regulatory assets																$ 31,600
Net regulatory liabilities																149,400
Regulatory liabilities																181,000
Annual CIP Filing | South Jersey Gas Company
Schedule of Capitalization [Line Items]
Approved rate increase (decrease)																					(7,600)
Annual CIP Filing | South Jersey Gas Company | Non-weather
Schedule of Capitalization [Line Items]
Approved rate increase (decrease)					$ (8,800)								10,100								(32,300)
Annual CIP Filing | South Jersey Gas Company | Weather
Schedule of Capitalization [Line Items]
Approved rate increase (decrease)					$ (6,500)								17,300								24,700
Accelerated Infrastructure Replacement Program II | South Jersey Gas Company
Schedule of Capitalization [Line Items]
Approved rate increase (decrease)																					6,700
Regulatory investment to be recovered by AIRP II																					64,500
Accelerated Infrastructure Replacement Program II | South Jersey Gas Company | New Jersey Board of Public Utilities
Schedule of Capitalization [Line Items]
Approved rate increase (decrease)				6,700									6,400
SHARP II Investments | South Jersey Gas Company
Schedule of Capitalization [Line Items]
Approved rate increase (decrease)																					2,900
SHARP II Investments | South Jersey Gas Company | New Jersey Board of Public Utilities
Schedule of Capitalization [Line Items]
Approved rate increase (decrease)						2,200							3,700
Requested rate increase (decrease), amount																									3,000
IIP Investments | South Jersey Gas Company | New Jersey Board of Public Utilities
Schedule of Capitalization [Line Items]
Requested rate increase (decrease), amount												$ (742,500)
Energy Efficiency Tracker | South Jersey Gas Company
Schedule of Capitalization [Line Items]
Approved rate increase (decrease)																											$ (1,600)
Annual EET Rate Adjustment | South Jersey Gas Company
Schedule of Capitalization [Line Items]
Approved rate increase (decrease)											$ 5,900								$ 1,300
Annual EEP Rate Adjustment | South Jersey Gas Company
Schedule of Capitalization [Line Items]
Requested rate increase (decrease), amount													$ 6,300
Annual EEP Rate Adjustment | South Jersey Gas Company | New Jersey Board of Public Utilities
Schedule of Capitalization [Line Items]
Net Utility Plant				$ 83,400																													$ 83,400
Requested rate increase (decrease), amount							(1,600)
Remediation Adjustment Clause
Schedule of Capitalization [Line Items]
Number of sites for environmental cleanup | site				12																													12
Amortization period of environmental remediation costs (in years)																																	7 years
New Jersey Clean Energy Program
Schedule of Capitalization [Line Items]
Public utilities, funding level							344,700
New Jersey Clean Energy Program | South Jersey Gas Company | Minimum
Schedule of Capitalization [Line Items]
Public utilities, funding level							12,700
New Jersey Clean Energy Program | South Jersey Gas Company | Maximum
Schedule of Capitalization [Line Items]
Public utilities, funding level							$ 13,200
Societal Benefits Clause | South Jersey Gas Company | New Jersey Board of Public Utilities
Schedule of Capitalization [Line Items]
Approved rate increase (decrease)																										$ (2,200)
USF and LL Programs | South Jersey Gas Company | Minimum
Schedule of Capitalization [Line Items]
Public utilities budget				$ 5,500																													$ 5,500
USF and LL Programs | South Jersey Gas Company | Maximum
Schedule of Capitalization [Line Items]
Public utilities budget				9,600																													9,600
Annual Tax Act Rider | South Jersey Gas Company
Schedule of Capitalization [Line Items]
Public utilities, customer refund term (in years)													3 years
Annual Tax Act Rider | South Jersey Gas Company | Protected Excess Deferred Income Tax
Schedule of Capitalization [Line Items]
Customer refund amount								11,600					$ 1,900
Over Collected Tax | South Jersey Gas Company
Schedule of Capitalization [Line Items]
Credits due to customers under conditions of approval																													13,800
Unprotected Excess Deferred Income Tax | South Jersey Gas Company
Schedule of Capitalization [Line Items]
Credits due to customers under conditions of approval																													$ 27,500
Public utilities, customer refund term (in years)																													5 years
Unprotected Excess Deferred Income Tax | Stipulation of Settlement | South Jersey Gas Company
Schedule of Capitalization [Line Items]
Credits due to customers under conditions of approval																$ 44,700
Public utilities, customer refund term (in years)																5 years
Unprotected Excess Deferred Income Tax | Annual Tax Act Rider | South Jersey Gas Company
Schedule of Capitalization [Line Items]
Approved rate increase (decrease)													$ 14,900
ETG Utility Operations
Schedule of Capitalization [Line Items]
Public utilities budget																											$ 3,000
Regulatory assets				189,671																													189,671	178,908
Regulatory liabilities				176,540																													176,540	175,217
ETG Utility Operations | Minimum
Schedule of Capitalization [Line Items]
Public utilities, funding level								10,600
ETG Utility Operations | Maximum
Schedule of Capitalization [Line Items]
Public utilities, funding level								11,500
ETG Utility Operations | Other Regulatory Assets
Schedule of Capitalization [Line Items]
Regulatory assets				9,655																													9,655	$ 4,541
ETG Utility Operations | Annual BGSS Filing
Schedule of Capitalization [Line Items]
Monthly bill adjustment basis (as a percent)					5.00%
Requested rate increase (decrease), amount					$ 19,100			11,300							$ (21,100)
ETG Utility Operations | New Jersey Board of Public Utilities
Schedule of Capitalization [Line Items]
Approved rate increase (decrease)																				$ 34,000
Approved rate of return on rate base, percentage																				6.50%
Approved return on common equity, percentage																				9.60%
Approved common equity component, percentage																				51.50%
Investment requested to be recovered through rider recovery mechanism, amount of IIP																												$ 518,000
Requested recovery of investment costs not yet approved																							$ 300,000
ETG Utility Operations | New Jersey Board of Public Utilities | Subsequent Event
Schedule of Capitalization [Line Items]
Approved rate increase (decrease)		$ 72,900	$ 72,900
ETG Utility Operations | New Jersey Board of Public Utilities | IIP Investments
Schedule of Capitalization [Line Items]
Net Utility Plant									64,000								$ 63,300
Requested rate increase (decrease), amount									7,100								$ 6,800
ETG Utility Operations | South Jersey Gas Company
Schedule of Capitalization [Line Items]
Public utilities, funding level				$ 9,000																													$ 9,000			$ 5,400
ETG Utility Operations | Annual EEP Rate Adjustment
Schedule of Capitalization [Line Items]
Approved rate increase (decrease)								$ (500)	$ 2,800																$ 1,300							$ 900
New program, term (in years)									3 years				3 years
Requested rate increase (decrease), amount														$ (200)								$ 1,000
Public utilities budget									$ 83,400
ETG Utility Operations | Annual EEP Rate Adjustment | New Jersey Board of Public Utilities
Schedule of Capitalization [Line Items]
Public utilities budget																																			$ 4,200
Amortization period of environmental remediation costs (in years)																																	10 years
ETG Utility Operations | Remediation Adjustment Clause
Schedule of Capitalization [Line Items]
Approved rate increase (decrease)																								$ 6,900
ETG Utility Operations | WNC/OCP/OSMC Rate Adjustment Petition
Schedule of Capitalization [Line Items]
Approved rate increase (decrease)						(5,500)							$ 7,100								(7,800)
Public utilities, annual revenue																					1,600
ETG Utility Operations | Annual WNC/CEP/OSMC Rate Adjustment | Weather
Schedule of Capitalization [Line Items]
Public utilities, annual revenue													5,500
ETG Utility Operations | RAC Rate Adjustment Petition
Schedule of Capitalization [Line Items]
Approved rate increase (decrease)																		$ 6,000
ETG Utility Operations | Annual RAC Rate Adjustment
Schedule of Capitalization [Line Items]
Requested rate increase (decrease), amount					$ (7,900)					$ (3,200)
ETG Utility Operations | CEP Rate Adjustment
Schedule of Capitalization [Line Items]
Approved rate increase (decrease)						$ (200)							$ 3,200								$ (100)