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REGULATION - ADDITIONAL INFORMATION (Details) - USD ($) $ in Millions |  |  |  |  |  | 6 Months Ended
--- | --- | --- | --- | --- | --- | ---
Mar. 28, 2024 | Mar. 20, 2024 | Jan. 31, 2024 | Dec. 01, 2023 | Nov. 09, 2023 | Mar. 31, 2024
Schedule of Regulatory Filings [Line Items] |  |  |  |  |  |
Approved rate increase (decrease), amount |  |  |  |  | $ 76.9 |
NJNG |  |  |  |  |  |
Schedule of Regulatory Filings [Line Items] |  |  |  |  |  |
Approved rate increase (decrease), amount | $ 43.5 |  |  |  |  |
Base Rate Stipulation |  |  |  |  |  |
Schedule of Regulatory Filings [Line Items] |  |  |  |  |  |
Weighted average cost of capital |  |  |  |  |  | 6.84%
Approved return on equity |  |  |  |  |  | 9.60%
SAVEGREEN |  |  |  |  |  |
Schedule of Regulatory Filings [Line Items] |  |  |  |  |  |
Capital investments approved by the BPU |  |  |  | $ 245.1 |  |
Financing options |  |  |  | 217.2 |  |
Operations and maintenance expense |  |  |  | $ 20.1 |  |
BPU | NJNG |  |  |  |  |  |
Schedule of Regulatory Filings [Line Items] |  |  |  |  |  |
Weighted average cost of capital |  |  | 7.57% |  |  |
Approved return on equity |  |  | 10.42% |  |  |
Approved rate increase (decrease), amount | $ 5.6 |  | $ 222.6 |  |  |
RAC |  |  |  |  |  |
Schedule of Regulatory Filings [Line Items] |  |  |  |  |  |
Approved rate increase (decrease), amount |  | $ 2.4 |  |  |  |
NJCEP |  |  |  |  |  |
Schedule of Regulatory Filings [Line Items] |  |  |  |  |  |
Approved rate increase (decrease), amount |  | $ 5.5 |  |  |  |

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