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REGULATION (Tables)
 12 Months Ended
Sep. 30, 2020
Regulated Operations [Abstract]  
Schedule of Regulatory Assets
Regulatory assets and liabilities included on the Consolidated Balance Sheets as of September 30, are composed of the following:
(Thousands)20202019
Regulatory assets-current
New Jersey Clean Energy Program$15,570 $15,468 
Conservation Incentive Program19,120 3,371 
Underrecovered natural gas costs— 9,506 
Derivatives at fair value, net— 4,526 
Other current regulatory assets1,682 — 
Total current regulatory assets$36,372 $32,871 
Regulatory assets-noncurrent
Environmental remediation costs:
Expended, net of recoveries$36,516 $38,351 
Liability for future expenditures150,590 131,080 
Deferred income taxes28,241 19,631 
Derivatives at fair value, net1 486 
SAVEGREEN21,281 10,201 
Postemployment and other benefit costs188,170 212,461 
Deferred storm damage costs6,515 8,687 
Cost of removal75,080 65,660 
Other noncurrent regulatory assets20,068 10,080 
Total noncurrent regulatory assets$526,462 $496,637 
Regulatory liability-current
Overrecovered natural gas costs$25,914 $— 
Derivatives at fair value, net274 — 
Total current regulatory liabilities$26,188 $— 
Regulatory liabilities-noncurrent
Tax Act impact (1)
$195,425 $200,417 
Derivatives at fair value, net352 — 
New Jersey Clean Energy Program— 197 
Other noncurrent regulatory liabilities509 1,821 
Total noncurrent regulatory liabilities$196,286 $202,435 
(1)Reflects the re-measurement and subsequent amortization of NJNG's net deferred tax liabilities as a result of the change in federal tax rates enacted in the Tax Act.
Schedule of Regulatory Liabilities
Regulatory assets and liabilities included on the Consolidated Balance Sheets as of September 30, are composed of the following:
(Thousands)20202019
Regulatory assets-current
New Jersey Clean Energy Program$15,570 $15,468 
Conservation Incentive Program19,120 3,371 
Underrecovered natural gas costs— 9,506 
Derivatives at fair value, net— 4,526 
Other current regulatory assets1,682 — 
Total current regulatory assets$36,372 $32,871 
Regulatory assets-noncurrent
Environmental remediation costs:
Expended, net of recoveries$36,516 $38,351 
Liability for future expenditures150,590 131,080 
Deferred income taxes28,241 19,631 
Derivatives at fair value, net1 486 
SAVEGREEN21,281 10,201 
Postemployment and other benefit costs188,170 212,461 
Deferred storm damage costs6,515 8,687 
Cost of removal75,080 65,660 
Other noncurrent regulatory assets20,068 10,080 
Total noncurrent regulatory assets$526,462 $496,637 
Regulatory liability-current
Overrecovered natural gas costs$25,914 $— 
Derivatives at fair value, net274 — 
Total current regulatory liabilities$26,188 $— 
Regulatory liabilities-noncurrent
Tax Act impact (1)
$195,425 $200,417 
Derivatives at fair value, net352 — 
New Jersey Clean Energy Program— 197 
Other noncurrent regulatory liabilities509 1,821 
Total noncurrent regulatory liabilities$196,286 $202,435 
(1)Reflects the re-measurement and subsequent amortization of NJNG's net deferred tax liabilities as a result of the change in federal tax rates enacted in the Tax Act.