 By August 16 , 2011 , the plant had generated 500 TWh of electricity . In July 2008 it generated 10 @.@ 3 TWh of electricity , its first month over 10 TWh . On June 30 , 2009 , after the river flow rate increased to over 24 @,@ 000 m3 , all 28 generators were switched on , producing only 16 @,@ 100 MW because the head available during flood season is insufficient . During an August 2009 flood , the plant first reached its maximum output for a short period . 
