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INCOME TAXES - DEFERRED TAX ASSETS AND LIABILITIES (Details) - USD ($) $ in Thousands | Sep. 30, 2022 | Sep. 30, 2021
--- | --- | ---
Deferred tax assets |  |
Investment tax credits | $ 212,506 | $ 225,036
State net operating losses | 36,950 | 38,108
Fair value of derivatives | 6,506 | 16,333
Impairment of equity method investment | 14,124 | 15,395
Postemployment benefits | 2,751 | 9,665
Incentive compensation | 7,297 | 6,894
Amortization of intangibles | 6,474 | 6,540
Overrecovered natural gas costs | 4,977 | 1,540
Allowance for doubtful accounts | 5,761 | 6,561
Other | 5,748 | 6,140
Total deferred tax assets | 303,094 | 332,212
Less: Valuation allowance | (22,241) | (23,613)
Total deferred tax assets net of valuation allowance | 280,853 | 308,599
Deferred tax liabilities |  |
Property-related items | (468,115) | (419,753)
Remediation costs | (18,490) | (16,347)
Investments in equity investees | (19,176) | (21,739)
Conservation incentive plan | (6,457) | (3,309)
Other | (4,615) | (6,203)
Total deferred tax liabilities | (516,853) | (467,351)
Total net deferred tax liabilities | (236,000) | (158,752)
Tax credit carryforward | 211,800 | 224,200
NJNG |  |
Deferred tax liabilities |  |
Tax credit carryforward | $ 732 | $ 814

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