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REGULATION - ADDITIONAL INFORMATION (Details) - USD ($) $ in Millions |  |  |  |  |  |  |  | 9 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 27, 2025 | May 30, 2025 | Apr. 23, 2025 | Dec. 18, 2024 | Dec. 17, 2024 | Nov. 21, 2024 | Oct. 30, 2024 | Jun. 30, 2025
Schedule of Regulatory Filings [Line Items] |  |  |  |  |  |  |  |
Annual recoveries |  |  |  |  |  |  | $ 12.3 |
Base Rate Stipulation |  |  |  |  |  |  |  |
Schedule of Regulatory Filings [Line Items] |  |  |  |  |  |  |  |
Weighted average cost of capital, percentage |  |  |  |  |  | 7.08% |  | 7.08%
Approved return on equity, percentage |  |  |  |  |  | 9.60% |  |
BPU |  |  |  |  |  |  |  |
Schedule of Regulatory Filings [Line Items] |  |  |  |  |  |  |  |
Approved return on equity, percentage |  |  |  |  |  |  |  | 9.60%
Total amount |  |  |  |  |  |  | 385.6 |
Approved equity capital structure, percentage |  |  |  |  |  | 54.00% |  |
Public utilities, approved depreciation rate, percentage |  |  |  |  |  | 3.21% |  |
BPU | NJNG |  |  |  |  |  |  |  |
Schedule of Regulatory Filings [Line Items] |  |  |  |  |  |  |  |
Requested rate increase (decrease), amount | $ (0.5) |  |  |  |  |  |  |
BPU | NJNG |  |  |  |  |  |  |  |
Schedule of Regulatory Filings [Line Items] |  |  |  |  |  |  |  |
Approved rate increase (decrease), amount |  |  |  |  |  | $ 157.0 |  |
Investment |  |  |  |  | $ 700.0 |  |  |
Program term |  |  |  |  | 3 years |  |  |
SAVEGREEN |  |  |  |  |  |  |  |
Schedule of Regulatory Filings [Line Items] |  |  |  |  |  |  |  |
Capital investments approved by the BPU |  |  |  | $ 3.1 |  |  | 205.0 |
Financing options |  |  |  |  |  |  | 160.5 |
Operations and maintenance expense |  |  |  |  |  |  | $ 20.1 |
SAVEGREEN | NJNG |  |  |  |  |  |  |  |
Schedule of Regulatory Filings [Line Items] |  |  |  |  |  |  |  |
Requested rate increase (decrease), amount |  | $ 17.3 |  |  |  |  |  |
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 |  |  | $ 1.6 |  |  |  |  |
BGSS |  |  |  |  |  |  |  |
Schedule of Regulatory Filings [Line Items] |  |  |  |  |  |  |  |
Requested rate increase (decrease), amount |  | 63.3 |  |  |  |  |  |
BGSS Balancing |  |  |  |  |  |  |  |
Schedule of Regulatory Filings [Line Items] |  |  |  |  |  |  |  |
Requested rate increase (decrease), amount |  | 6.1 |  |  |  |  |  |
Conservation Incentive Program |  |  |  |  |  |  |  |
Schedule of Regulatory Filings [Line Items] |  |  |  |  |  |  |  |
Requested rate increase (decrease), amount |  | $ (25.5) |  |  |  |  |  |

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