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DERIVATIVE INSTRUMENTS - BALANCE SHEET RELATED DISCLOSURES (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Sep. 30, 2024
Fair Value    
Derivative assets, current $ 5,073 $ 6,813
Derivative liability, current 13,463 6,271
Derivative assets, noncurrent 1,872 806
Derivative liabilities, noncurrent 12,321 11,490
Not Designated as Hedging Instrument    
Fair Value    
Derivative assets 6,945 7,619
Derivative liabilities 25,784 17,761
NJNG | Not Designated as Hedging Instrument | Physical commodity contracts    
Fair Value    
Derivative assets, current 159 21
Derivative liability, current 728 579
NJNG | Not Designated as Hedging Instrument | Financial commodity contracts    
Fair Value    
Derivative assets, current 10 0
Derivative liability, current 2,327 2
ES | Not Designated as Hedging Instrument | Physical commodity contracts    
Fair Value    
Derivative assets, current 2,079 1,660
Derivative liability, current 7,049 4,346
Derivative assets, noncurrent 1,602 727
Derivative liabilities, noncurrent 12,052 10,758
ES | Not Designated as Hedging Instrument | Financial commodity contracts    
Fair Value    
Derivative assets, current 2,825 5,132
Derivative liability, current 3,359 1,344
Derivative assets, noncurrent 270 79
Derivative liabilities, noncurrent $ 269 $ 732