REGULATION - ADDITIONAL INFORMATION (Details) - USD ($) $ in Millions				3 Months Ended
	Jan. 31, 2024	Dec. 01, 2023	Nov. 09, 2023	Dec. 31, 2023
Schedule of Regulatory Filings [Line Items]
Approved rate increase (decrease), amount			$ 76.9
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 | Subsequent Event
Schedule of Regulatory Filings [Line Items]
Weighted average cost of capital	7.57%
Approved rate increase (decrease), amount	$ 222.6