LINES OF CREDIT AND SHORT-TERM BORROWINGS - Schedule of Lines of Credit (Details)	Jun. 30, 2022 USD ($)
Line of Credit
Line of Credit Facility [Line Items]
Total Facility	$ 1,000,000,000
Usage	352,200,000
Available Liquidity	647,800,000
SJI | Line of Credit | Line of Credit
Line of Credit Facility [Line Items]
Total Facility	500,000,000
Usage	255,400,000
Available Liquidity	244,600,000
Letters of credit outstanding	15,400,000
South Jersey Gas Company | Line of Credit | Line of Credit
Line of Credit Facility [Line Items]
Letters of credit outstanding	1,900,000
South Jersey Gas Company | Commercial Paper and Letters of Credit | Revolving Credit Facility
Line of Credit Facility [Line Items]
Total Facility	250,000,000
Usage	26,700,000
Available Liquidity	223,300,000
ETG | Line of Credit | Line of Credit
Line of Credit Facility [Line Items]
Letters of credit outstanding	1,000,000
ETG | Line of Credit | Revolving Credit Facility
Line of Credit Facility [Line Items]
Total Facility	250,000,000
Usage	70,100,000
Available Liquidity	$ 179,900,000