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REGULATION - REGULATORY FILINGS (Details) - USD ($) $ in Thousands |  |  |  |  |  |  |  |  |  | 2 Months Ended
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Jul. 09, 2021 | Jun. 25, 2021 | Jun. 11, 2021 | May 28, 2021 | Apr. 07, 2021 | Mar. 31, 2021 | Mar. 30, 2021 | Mar. 03, 2021 | Oct. 28, 2020 | Jan. 31, 2021
BPU | Natural Gas Distribution |  |  |  |  |  |  |  |  |  |
Schedule of Regulatory Filings [Line Items] |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease), amount |  |  |  |  |  |  | $ 165,700 |  |  |
BPU | Natural Gas Distribution | Subsequent Event |  |  |  |  |  |  |  |  |  |
Schedule of Regulatory Filings [Line Items] |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease), amount | $ 163,900 |  |  |  |  |  |  |  |  |
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 |  |  |  | $ 2,900 |  |  |  | $ (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 |  |
Annual recovery increase |  |  | $ 2,200 |  |  |  |  | 15,600 |  |
BGSS Balancing | Natural Gas Distribution |  |  |  |  |  |  |  |  |  |
Schedule of Regulatory Filings [Line Items] |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease), amount |  |  |  | 13,000 |  |  |  | (3,800) |  |
Conservation Incentive Program | Natural Gas Distribution |  |  |  |  |  |  |  |  |  |
Schedule of Regulatory Filings [Line Items] |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease), amount |  |  |  | $ (1,600) |  |  |  | $ 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 |  |  |  |  |  |  |  |  |  |
Schedule of Regulatory Filings [Line Items] |  |  |  |  |  |  |  |  |  |
Approved rate increase (decrease), amount |  |  |  |  | $ 1,300 |  |  |  |  |
NJCEP |  |  |  |  |  |  |  |  |  |
Schedule of Regulatory Filings [Line Items] |  |  |  |  |  |  |  |  |  |
Approved rate increase (decrease), amount |  |  |  |  | $ 6,000 |  |  |  |  |
USF |  |  |  |  |  |  |  |  |  |
Schedule of Regulatory Filings [Line Items] |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease), amount |  | $ 4,900 |  |  |  |  |  |  |  |

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