PROPERTY, PLANT AND EQUIPMENT, NET (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Property, plant and equipment, net      
Property, plant and equipment, gross, excluding construction in progress $ 638,510 $ 623,223  
Less: Accumulated depreciation (98,513) (74,852)  
Property, plant and equipment, net excluding construction in progress 539,997 548,371  
Total 540,242 548,511  
Dams and reservoirs
     
Property, plant and equipment, net      
Property, plant and equipment, gross, excluding construction in progress 348,905 339,123  
Buildings
     
Property, plant and equipment, net      
Property, plant and equipment, gross, excluding construction in progress 127,356 124,154  
Machinery
     
Property, plant and equipment, net      
Property, plant and equipment, gross, excluding construction in progress 158,527 153,837  
Transportation equipment
     
Property, plant and equipment, net      
Property, plant and equipment, gross, excluding construction in progress 1,925 1,865  
Electronic equipment and others
     
Property, plant and equipment, net      
Property, plant and equipment, gross, excluding construction in progress 1,797 4,244  
Construction in progress, net
     
Property, plant and equipment, net      
Construction in progress, net $ 245 $ 140 $ 1,190