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INCOME TAXES - DEFERRED TAX ASSETS AND LIABILITIES (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Sep. 30, 2017
--- | --- | ---
Deferred tax assets |  |  |
Investment tax credits | [1] | $ 123,258 | $ 111,642
Deferred service contract revenue |  | 0 | 3,877
Incentive compensation |  | 4,646 | 6,260
Fair value of derivatives |  | 8,411 | 11,519
Federal net operating losses | [2] | 24,500 | 28,487
State net operating losses |  | 34,754 | 23,597
Amortization of intangibles |  | 3,737 | 2,747
Conservation incentive plan |  | 1,955 | 0
Other |  | 8,213 | 11,098
Total deferred tax assets |  | 209,474 | 199,227
Deferred tax liabilities |  |  |
Property related items |  | (392,886) | (620,850)
Remediation costs |  | (9,229) | (11,625)
Equity investments |  | (31,956) | (38,370)
Postemployment benefits |  | (353) | (6,855)
Conservation incentive plan |  | 0 | (7,195)
Underrecovered gas costs |  | (1,156) | (4,035)
Other |  | (7,826) | (16,643)
Total deferred tax liabilities |  | (443,406) | (705,573)
Total net deferred tax liabilities |  | (233,932) | (506,346)
Natural Gas Distribution |  |  |
Deferred tax liabilities |  |  |
Tax credit carryforward |  | 2,200 | 2,300
Clean Energy Ventures |  |  |
Deferred tax liabilities |  |  |
Tax credit carryforward |  | $ 121,100 | $ 109,300
[1] | Includes $2.2 million and $2.3 million for NJNG for fiscal 2018 and 2017, respectively, which is being amortized over the life of the related assets, and$121.1 million and $109.3 million for Clean Energy Ventures for fiscal 2018 and 2017, respectively, which is ITC carryforward.
[2] | See discussion of federal net operating loss utilization in the Other Tax Items section of this note.

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