Water world I am standing by the Seyhan River, in Turkey, and watching fish swimming in the water. How many rivers like this are there in the world? Think of all that water running down towards the sea. Moving water has much more energy than the wind, and of course, it never stops. Hydroelectric power A hydroelectric power station uses the power of water to produce electricity. The Itaipu Dam, between Brazil and Paraguay, is one of the largest hydroelectric power stations in the world. It took 40,000 workers nine years to build it, and engineers had to move the Parana River one of the greatest rivers on earth. The Itaipu Dam is as tall as a skyscraper. Behind a dam, water is kept in a lake called a