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SUBSEQUENT EVENTS	12 Months Ended
SUBSEQUENT EVENTS	Dec. 31, 2017
Subsequent Events [Abstract]
SUBSEQUENT EVENTS	SUBSEQUENT EVENTS: In January 2018, SJI issued the following MTN's: (a) $25.0 million aggregate principal amount of 3.32% Senior Notes, Series 2017A-2, due January 2025 and (b) $25.0 million aggregate principal amount of 3.56% Senior Notes, Series 2017B-2, due January 2028. In January 2018, the BPU issued an Order directing the New Jersey utilities, including SJG, to submit filings by March 2, 2018, proposing the prospective change in rates as a result of Tax Reform, the method to return to customers the rate difference from January 1, 2018 through the effective date of the rate change, and the method by which the excess deferred taxes will be returned to customers.