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RELATED PARTY TRANSACTIONS (Details) $ in Thousands |  | 1 Months Ended | 3 Months Ended |  |
--- | --- | --- | --- | --- | ---
Apr. 01, 2020 USD ($) Bcf | Mar. 31, 2021 | Dec. 31, 2021 USD ($) dth / d lease Bcf | Dec. 31, 2020 USD ($) | Sep. 30, 2021 USD ($) | Jul. 31, 2021
Related Party Transaction [Line Items] |  |  |  |  |  |
Demand fees expense recognized pertaining to related party agreement |  |  | $ 1,846 | $ 1,734 |  |
Demand fees payable |  |  | $ 851 |  | $ 861 |
Number of asset management agreements | lease |  |  | 1 |  |  |
NJNG to NJRES Affiliate |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Asset management agreement, period | 5 years |  |  |  |  |
NJNG to Steckman RIdge Affiliate |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Natural gas sold at cost under asset management agreement (in Bcf) | Bcf | 3 |  |  |  |  |
Approximate annual demand fees under agreement | $ 9,300 |  |  |  |  |
Demand fees expense recognized pertaining to related party agreement |  |  | $ 1,558 | 1,568 |  |
Demand fees payable |  |  | 775 |  | 778 |
NJRES to Steckman Ridge Affiliate |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Demand fees expense recognized pertaining to related party agreement |  |  | 288 | $ 166 |  |
Demand fees payable |  |  | $ 76 |  | $ 83 |
NJN G to Adelphia Affiliate |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Transportation precedent agreement term |  |  | 5 years |  |  |
Transportation capacity under precedent agreement with PennEast (in bcf per day) | dth / d |  |  | 130,000 |  |  |
Leaf River Energy Center LLC |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Natural gas sold at cost under asset management agreement (in Bcf) | Bcf |  |  | 3 |  |  |
Storage capacity agreement term |  |  | 5 years |  |  |
NJNG and Clean Energy Ventures to PPA |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Sublease agreement term |  | 15 years |  |  |  |
NJNG To NJR Subsidiaries |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Term of contract |  |  |  |  |  | 16 years

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