Tongland Power Station generates hydroelectricity from the power of the River Dee. A simple demonstration with plastic bottles is used to explain how electricity is generated. Water from the River Dee is collected into a reservoir. This is then released through a pipe which channels it towards a turbine. The moving water turns the turbine, which generates the electricity. After this the water continues its flow down the Dee towards the sea. Tongland is one of six power stations on this river system. It generates enough electricity to light up 18,000 homes.
This clip can be used to consolidate the pupils’ understanding of the water cycle. Prior to watching the clip, encourage everyone to explain each stage of the water cycle to another pupil in the class. The pupils can then be shown the clip. Once they have watched it through, they can be asked to explain the journey of a water droplet from the reservoir. Information provided in the clip can assist the children in organising the stages of the journey until they reach the sea. They can then use their prior knowledge of the water cycle to complete this work. Other ideas can be developed around mapping the journey of water from reservoirs near the pupils’ own locality. They can research which rivers form part of the system and which sea will they drain in to.