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REGULATION - REGULATORY FILINGS (Details) - USD ($) $ in Thousands | Mar. 30, 2020 | Mar. 16, 2020 | Nov. 15, 2019 | Nov. 01, 2019
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NJNG EE Recovery Rate | NJNG |  |  |  |
Schedule of Regulatory Filings [Line Items] |  |  |  |
Approved rate increase (decrease), amount |  |  |  | $ 11,300
Base Rate Stipulation |  |  |  |
Schedule of Regulatory Filings [Line Items] |  |  |  |
Approved rate increase (decrease), amount |  |  | $ 62,200 |
Approved rate increase (decrease) |  |  | 6.95% |
Approved return on equity |  |  | 9.60% |
Approved equity capital structure, percentage |  |  | 54.00% |
Approved depreciation rate |  |  | 2.78% |
RAC | NJNG |  |  |  |
Schedule of Regulatory Filings [Line Items] |  |  |  |
Requested rate increase (decrease), amount |  | $ 1,200 |  |
NJCEP | NJNG |  |  |  |
Schedule of Regulatory Filings [Line Items] |  |  |  |
Requested rate increase (decrease), amount |  | $ (600) |  |
NJ RISE Program | NJNG |  |  |  |
Schedule of Regulatory Filings [Line Items] |  |  |  |
Requested rate increase (decrease), amount | $ 7,400 |  |  |
Series II | NJNG |  |  |  |
Schedule of Regulatory Filings [Line Items] |  |  |  |
Requested rate increase (decrease), amount | $ 68,700 |  |  |

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