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ACQUISITION (Details) - Talen's Wholesale Natural Gas Energy Contracts - USD ($) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Jul. 27, 2017 | Sep. 30, 2017
Business Acquisition [Line Items] |  |
Total purchase price consideration transferred | $ 55,661 |
Net assets acquired | 55,661 |
Goodwill |  | $ 0
Acquisition related transaction costs |  | 300
Revenue attributable to the acquisition |  | 20,500
Operating loss attributable to the acquisition |  | 281
Wholesale Energy Contracts |  |
Business Acquisition [Line Items] |  |
Wholesale energy contracts | 41,846 |
Amortization expense |  | $ 762
Retail Energy Contracts |  |
Business Acquisition [Line Items] |  |
Retail energy contracts | $ 13,815 |
Minimum | Wholesale Energy Contracts |  |
Business Acquisition [Line Items] |  |
Useful life | 1 year |
Minimum | Retail Energy Contracts |  |
Business Acquisition [Line Items] |  |
Useful life | 0 years |
Maximum | Wholesale Energy Contracts |  |
Business Acquisition [Line Items] |  |
Useful life | 9 years |
Maximum | Retail Energy Contracts |  |
Business Acquisition [Line Items] |  |
Useful life | 4 years |

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