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DERIVATIVES (Volumes of Outstanding Derivative Contracts, in Megawatt Hours Unless Otherwise Specified) (Details) | Jun. 30, 2019 MWh MMBTU | Dec. 31, 2018 MWh MMBTU
--- | --- | ---
Forwards, Futures and Swaps | Natural Gas |  |
Derivative [Line Items] |  |
Contract Volume (mmbtu and mwh) | MMBTU | 174,575,917 | 177,750,349
Forwards, Futures and Swaps | Electricity |  |
Derivative [Line Items] |  |
Contract Volume (mmbtu and mwh) | 2,999,616 | 3,833,490
Options | Natural Gas |  |
Derivative [Line Items] |  |
Contract Volume (mmbtu and mwh) | MMBTU | 16,455,000 | 13,735,405
Options | Electricity |  |
Derivative [Line Items] |  |
Contract Volume (mmbtu and mwh) | 912,033 | 0
Congestion Revenue Rights | Electricity |  |
Derivative [Line Items] |  |
Contract Volume (mmbtu and mwh) | 329,571,344 | 340,783,089

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