The river water in the tubes is then itself cooled in the cooling towers . Some of the water evaporates producing the familiar white water vapour which is seen rising into the air from the cooling towers when the power station in generating electricity. On cold Autumn and Winter days the water vapour is enhanced and produces large cloud like plumes. Some of the water is then returned to the river a few degrees warmer than when it was taken. The maximum return temperature of the water to the river is 30 degrees Celsius.
Water is used from the River Severn for cooling.