Wivenhoe power station Station generating capacity Rated 500MW Maximum 625MW Transmission voltage 275,000V Number of units 2 Pump capacity 207m3/sec Pump impeller diameter 7.95m Length of pump drive shaft 22m Turbine rating 260MW Turbine runner diameter 6.6m Generator/rotor rating 312.5MVA Diameter of generator rotor 12.5m Operating head range 64-117.5m