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INVESTMENTS IN AFFILIATES - Tax equity transactions (Details) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 | Oct. 31, 2015 | Aug. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015
Class A membership interests |  |  |  |  |
Tax equity transactions |  |  |  |  |
Receipt of future cash flow distributions (as a percent) |  |  |  | 51.00% |
Class B membership interests |  |  |  |  |
Tax equity transactions |  |  |  |  |
Receipt of future cash flow distributions (as a percent) |  |  |  | 49.00% |
Tranquillity, Garland, and Roserock |  |  |  |  |
Tax equity transactions |  |  |  |  |
Payment received recognized as revenue |  |  |  |  | $ 190.4
Further contribution |  |  |  | $ 123.2 | $ 69.5
Tranquillity |  |  |  |  |
Tax equity transactions |  |  |  |  |
Ownership Percentage | 49.00% |  |  | 49.00% | 49.00%
Net assets derecognized |  |  |  |  | $ 93.9
Tranquillity | Class A membership interests |  |  |  |  |
Tax equity transactions |  |  |  |  |
Percentage of interest sold |  |  | 100.00% |  |
Proceeds from sale of membership interest |  |  | $ 100.0 |  |
Tranquillity | Class B membership interests |  |  |  |  |
Tax equity transactions |  |  |  |  |
Ownership Percentage |  |  | 100.00% |  |
Garland |  |  |  |  |
Tax equity transactions |  |  |  |  |
Ownership Percentage | 49.00% |  |  | 49.00% | 49.00%
Net assets derecognized |  |  |  |  | $ 56.4
Silverlake | Class A membership interests |  |  |  |  |
Tax equity transactions |  |  |  |  |
Percentage of interest sold |  | 100.00% |  |  |
Proceeds from sale of membership interest |  | $ 49.0 |  |  |
Silverlake | Class B membership interests |  |  |  |  |
Tax equity transactions |  |  |  |  |
Ownership Percentage |  | 100.00% |  |  |
Roserock |  |  |  |  |
Tax equity transactions |  |  |  |  |
Ownership Percentage | 49.00% |  |  | 49.00% | 49.00%
Net assets derecognized |  |  |  |  | $ 23.5
Roserock | Class A membership interests |  |  |  |  |
Tax equity transactions |  |  |  |  |
Percentage of interest sold | 100.00% |  |  |  |
Proceeds from sale of membership interest | $ 45.0 |  |  |  |
Roserock | Class B membership interests |  |  |  |  |
Tax equity transactions |  |  |  |  |
Ownership Percentage | 100.00% |  |  |  | 100.00%

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