It is subsequently discharged into the lower reservoir .
When the pumped storage capability is used , the Panjiakou Reservoir serves as the upper reservoir and water is released down to the three pump generators for power production .
Panjiakou Reservoir is subsequently discharged into the lower reservoir .
When the pumped storage capability is used , the Panjiakou Reservoir serves as the upper reservoir and water is released down to the three pump generators for power production .