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Hydroelectricity is electrical power generated from running water.

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The water source, such as a river, stream, or waterfall, is trapped behind a dam. The water is allowed to stream down an incline (called a pen stock) behind the dam when a gate is opened, and the water's speed accelerates as it goes down the incline. This makes it spin a turbine, which generates electricity in a generator. Then the power flows through a transformer and the new electricity then runs along power lines to homes and buildings.

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Hydroelectricity is a renewable resource, as it keeps being generated as fast as we use it.

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There is no direct waste produced through hydroelectricity, but there are negative effects of hydro power, including disrupting animal life and using large amounts of land.

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After the electricity is generated in a generator, it then goes through a transformer which then runs through power lines.

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Hydro power plants usually have a life span of one hundred years if maintained properly.

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1. It's renewable
2. Makes reservoirs that can contribute to recreation
3. Readily available

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1. Very expensive to build a hydro power plant
2. Negatively impacts fish migration and population
3. If it doesn't rain, less water can flow through the pen stock, which means less electricity.

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Hydroelectric stations are found in 34 states around the country. The largest hydroelectric plant in the country is Grand Coulee in the state of Washington.

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China is the biggest producer of hydro power in the world, with others such as Brazil, Canada, and the United States. Hydroelectricity contributes 20% of the world's renewable energy.

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http://water.usgs.gov/edu/hyhowworks.html http://www.eia.gov/todayinenergy/detail.php?id=16891

http://environment.nationalgeographic.com/environment/global-warming/hydropower-profile/

http://fwee.org/environment/how-a-hydroelectric-project-can-affect-a-river/

http://www.renewablesfirst.co.uk/hydropower/hydropower-learning-centre/how-long-will-hydropower-systems-last/