these near the Portuguese coast, gett power from the restless waves of the Atlantic When wave power generators go up and down o water, liquids inside them move. The liquids turn turbines or push other devices to generate power. Long cables under the sca carry the electricity to the land. The great thing about wave power is that you can get electricity 24 hours a day. The problem is that the waves can be too big. Storms can destroy the machines or break the cables. Getting power from the waves is still very difficult, but people are developing new devices all the time. In May 2010 a ship pulled a 200 etre wave power generator through Atlantic waters to Orkney north of Scotland. In a few years, sixty-five more machines will join it, and together they will produce power for about 30,000 homes. Building and using the generators will mean new jobs for hundreds of people in Scotland. Near New York City, six turbines sit at the bottom of the East River. They are 5 metres across and they look like wind turbines, but they get energy from sea water that moves past them twice a day In places where rivers join the sea, t water can go up and down 10 metres or more, so it move very fast and has a lot of energy. To use this energy, we can put turbines under the water or build dams. The world's biggest dam that uses the power of the sea is at La Rance, in rance, it is more than 300 metres long and s twenty-four turbines produce enough power for a city of more than 200,000 people. Near the c st of Kona, Hawaii, the weather is sunny and the sea is very deep. The water is warm at the surface, but 1.000 metres below this it is 10-20"C cooler. People use this temperature difference to make power, Power stations