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DERIVATIVES (Volumes of Outstanding Derivative Contracts, in Megawatt Hours Unless Otherwise Specified) (Details) | Mar. 31, 2018 MWh MMBTU | Dec. 31, 2017 MWh MMBTU
--- | --- | ---
Forwards, Futures and Swaps | Natural gas |  |
Derivative [Line Items] |  |
Contract Volume | MMBTU | 184,948,051 | 228,768,745
Forwards, Futures and Swaps | Electricity |  |
Derivative [Line Items] |  |
Contract Volume | MWh | 2,602,376 | 2,872,013
Options | Natural gas |  |
Derivative [Line Items] |  |
Contract Volume | MMBTU | 31,481,247 | 60,736,806
Congestion Revenue Rights | Electricity |  |
Derivative [Line Items] |  |
Contract Volume | MWh | 304,484,831 | 312,272,177

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