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REGULATION (Tables)
9 Months Ended
Jun. 30, 2025
Regulated Operations [Abstract]  
Schedule of Regulatory Assets
Regulatory assets and liabilities included on the Unaudited Condensed Consolidated Balance Sheets for NJNG are comprised of the following:
(Thousands)June 30,
2025
September 30,
2024
Regulatory assets-current
New Jersey Clean Energy Program$18,688 $18,491 
Conservation Incentive Program25,957 51,442 
Derivatives at fair value, net 1,363 
Other current regulatory assets1,571 1,774 
Total current regulatory assets$46,216 $73,070 
Regulatory assets-noncurrent
Environmental remediation costs:
Expended, net of recoveries$70,512 $77,475 
Liability for future expenditures155,861 161,650 
Deferred income taxes44,516 42,595 
SAVEGREEN122,996 107,796 
Postemployment and other benefit costs26,541 23,772 
Cost of removal132,494 130,885 
Other noncurrent regulatory assets57,946 59,924 
Total noncurrent regulatory assets$610,866 $604,097 
Regulatory liability-current
Overrecovered natural gas costs$12,561 $32,457 
Derivatives at fair value, net13,054 — 
Total current regulatory liabilities$25,615 $32,457 
Regulatory liabilities-noncurrent
Tax Act impact$171,564 $175,328 
Derivatives at fair value, net 404 
Other noncurrent regulatory liabilities124 115 
Total noncurrent regulatory liabilities$171,688 $175,847 

Regulatory assets and liabilities included on the Unaudited Condensed Consolidated Balance Sheets for Adelphia are comprised of the following:
(Thousands)June 30,
2025
September 30,
2024
Total noncurrent regulatory assets$4,993 $5,095 
Total current regulatory liabilities$3,537 $524 
Schedule of Regulatory Liabilities
Regulatory assets and liabilities included on the Unaudited Condensed Consolidated Balance Sheets for NJNG are comprised of the following:
(Thousands)June 30,
2025
September 30,
2024
Regulatory assets-current
New Jersey Clean Energy Program$18,688 $18,491 
Conservation Incentive Program25,957 51,442 
Derivatives at fair value, net 1,363 
Other current regulatory assets1,571 1,774 
Total current regulatory assets$46,216 $73,070 
Regulatory assets-noncurrent
Environmental remediation costs:
Expended, net of recoveries$70,512 $77,475 
Liability for future expenditures155,861 161,650 
Deferred income taxes44,516 42,595 
SAVEGREEN122,996 107,796 
Postemployment and other benefit costs26,541 23,772 
Cost of removal132,494 130,885 
Other noncurrent regulatory assets57,946 59,924 
Total noncurrent regulatory assets$610,866 $604,097 
Regulatory liability-current
Overrecovered natural gas costs$12,561 $32,457 
Derivatives at fair value, net13,054 — 
Total current regulatory liabilities$25,615 $32,457 
Regulatory liabilities-noncurrent
Tax Act impact$171,564 $175,328 
Derivatives at fair value, net 404 
Other noncurrent regulatory liabilities124 115 
Total noncurrent regulatory liabilities$171,688 $175,847 

Regulatory assets and liabilities included on the Unaudited Condensed Consolidated Balance Sheets for Adelphia are comprised of the following:
(Thousands)June 30,
2025
September 30,
2024
Total noncurrent regulatory assets$4,993 $5,095 
Total current regulatory liabilities$3,537 $524