REGULATION - REGULATORY FILINGS (Details) - USD ($) $ in Thousands						4 Months Ended
	Apr. 07, 2021	Mar. 31, 2021	Mar. 30, 2021	Mar. 03, 2021	Oct. 28, 2020	Mar. 31, 2021
BPU | Natural Gas Distribution
Schedule of Regulatory Filings [Line Items]
Requested rate increase (decrease), amount			$ 165,700
BPU | Natural Gas Distribution
Schedule of Regulatory Filings [Line Items]
Approved rate increase (decrease), amount					$ 150,000
IIP approved term					5 years
BGSS | Natural Gas Distribution
Schedule of Regulatory Filings [Line Items]
Requested rate increase (decrease), amount				$ (20,400)
BGSS | Natural Gas Distribution
Schedule of Regulatory Filings [Line Items]
Interim rate increase (decrease), amount						$ (20,600)
Interim rate increase (decrease), amount, net of tax						$ (19,300)
SAVEGREEN
Schedule of Regulatory Filings [Line Items]
Public utility extension term				3 years
Capital investments approved by the BPU				$ 126,100
Financing options				109,400
Operations and maintenance expense				23,400
BGSS Balancing | Natural Gas Distribution
Schedule of Regulatory Filings [Line Items]
Requested rate increase (decrease), amount				(3,800)
Conservation Incentive Program | Natural Gas Distribution
Schedule of Regulatory Filings [Line Items]
Requested rate increase (decrease), amount				$ 16,500
NJ RISE And SAFE II Capital Investments | Natural Gas Distribution
Schedule of Regulatory Filings [Line Items]
Requested rate increase (decrease), amount		$ 311
Capital investment costs		$ 3,400
RAC | Subsequent Event
Schedule of Regulatory Filings [Line Items]
Approved rate increase (decrease), amount	$ 1,300
NJCEP | Subsequent Event
Schedule of Regulatory Filings [Line Items]
Approved rate increase (decrease), amount	$ 6,000