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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - ASSETS HELD FOR SALE (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Sep. 30, 2018
--- | --- | ---
Assets Held For Sale Activity [Roll Forward] |  |  |
Liabilities held for sale: |  | $ 4,182 | $ 4,182
Clean Energy Ventures |  |  |
Assets Held For Sale Activity [Roll Forward] |  |  |
Nonutility plant and equipment - wind equipment, at cost |  | 224,356 | 224,356
Nonutility plant and equipment - accumulated depreciation, wind equipment |  | (18,501) | (18,501)
Prepaid and other current assets |  | 1,621 | 789
Other noncurrent assets |  | 261 | 261
Assets held for sale: |  | 207,737 | 206,905
Accounts payable and other | [1] | 186 | 186
Asset retirement obligation |  | 3,996 | 3,996
Liabilities held for sale: |  | 4,182 | $ 4,182
Held-for-sale | Clean Energy Ventures |  |  |
Assets Held For Sale Activity [Roll Forward] |  |  |
Nonutility plant and equipment - wind equipment, at cost |  | 0 |
Nonutility plant and equipment - accumulated depreciation, wind equipment |  | 0 |
Prepaid and other current assets |  | 1,535 |
Other noncurrent assets |  | 0 |
Assets held for sale: |  | 1,535 |
Accounts payable and other | [1] | 0 |
Asset retirement obligation |  | 0 |
Liabilities held for sale: |  | 0 |
Assets sold | Clean Energy Ventures |  |  |
Assets Held For Sale Activity [Roll Forward] |  |  |
Nonutility plant and equipment - wind equipment, at cost |  | 0 |
Nonutility plant and equipment - accumulated depreciation, wind equipment |  | 0 |
Prepaid and other current assets |  | 0 |
Other noncurrent assets |  | 0 |
Assets held for sale: |  | 0 |
Accounts payable and other | [1] | 0 |
Asset retirement obligation |  | 0 |
Liabilities held for sale: |  | 0 |
Other adjustments | Clean Energy Ventures |  |  |
Assets Held For Sale Activity [Roll Forward] |  |  |
Nonutility plant and equipment - wind equipment, at cost |  | 0 |
Nonutility plant and equipment - accumulated depreciation, wind equipment |  | 0 |
Prepaid and other current assets |  | (703) |
Other noncurrent assets |  | 0 |
Assets held for sale: |  | (703) |
Accounts payable and other | [1] | 0 |
Asset retirement obligation |  | 0 |
Liabilities held for sale: |  | $ 0 |
[1] | Transaction fee owed to broker for the sale of Two Dot wind farm.

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