SPECIAL PURPOSE ENTITIES - Additional Information (Details) - GPS $ in Millions |
1 Months Ended | 12 Months Ended |
---|---|---|
Jan. 31, 2015
USD ($)
|
Jan. 31, 2016
item
project
|
|
Variable Interest Entity | ||
Number of natural gas-fired power plants | project | 2 | |
Number of joint ventures | item | 2 | |
Cash distributions to joint venture partner | $ | $ 25 |