Альтернативная энергия

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A dam can be used to trap a large area of water, like a reservoir or a lake. This water then flows through tunnels in the dam, turns turbines and drives generators to create electricity. Hydro-electric power stations can produce a lot of power very cheaply . Hydroelectric power is generated by pumping water. Water (hydroelectric power)

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We get the solar energy from the Sun . Enough of the sun's energy hits the Earth every minute to power the world for a whole year! In sunny countries, solar cells can be put on rooftops to convert sunlight directly into electricity. We could even build solar power stations like Solar One in California. This uses the sun's heat to make steam, which then drives generator to produce electricity. Sun (solar power )

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We can use the power of the wind by building wind turbines. These are tall towers with a big propeller on top. The wind blows the propeller, which turns a generator in order to create electricity. If we build a number of wind turbines together in a windy place, we can make a 'wind farm' and produce quite a lot of electricity! Wind power is relatively cheap in long term. Wind (wind power )