 During the November to May dry season , power output is limited by the river 's flow rate , as seen in the diagrams on the right . When there is enough flow , power output is limited by plant generating capacity . The maximum power @-@ output curves were calculated based on the average flow rate at the dam site , assuming the water level is 175 m and the plant gross efficiency is 90 @.@ 15 % . The actual power output in 2008 was obtained based on the monthly electricity sent to the grid . 
