The barrage also destroys homes to many birds, fish and other animals. Hydroelectric power Hydroelectric power generates electricity from falling water. A dam collects water into a reservoir. When the dam gates are opened, the water surges through a tunnel to turbines. The water turns the turbines which turn generators to produce electricity.
Hydroelectric dams are expensive to build.
They also need relatively large areas of water close to civilisation. Organic, biodegradable waste is collected and compacted to a specific density in a repository. Gas production begins as the waste is broken down by microbes. The pipes are connected to engines, which are powered by the gas to produce electricity. If the gas is not collected it could be harmful to the atmosphere.