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Niagara Falls was the site of the country’s first hydroelectric generating facility -- built in 1881 when Charles Brush connected a generator to turbines powered by the falls and used the electricity to power nighttime lighting for visiting tourists. America’s first commercial hydropower facility was built in 1882 in Appleton, Wisconsin -- powering lighting for a paper mill and multiple homes.

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Hydropower is one of the oldest sources of power, going back into ancient greece where farmers used it for mechanical tasks like grinding grain.

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Dams are built for a number of uses in addition to producing electricity, such as irrigation, shipping and navigation, flood control or to create reservoirs for recreational activities. In fact, only 3 percent of the nation’s 80,000 dams currently generate power. An Energy Department-funded study found that 12 gigawatts of hydroelectric generating capacity could be added to existing dams around the country.

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Every state uses hydropower for electricity, and some states use a lot of it.

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https://assets.clearpath.org/2016/10/0da62479aca710dfe6145d90a15bff1d-hydropower.jpg
https://www.eia.gov/state/?sid=NC
https://www.energy.gov/articles/top-10-things-you-didnt-know-about-hydropower
https://www.nationalgeographic.com/environment/global-warming/hydropower/
http://www.carolana.com/NC/Counties/Images/Buncombe_1911_to_1920.jpg
https://populationeducation.org/sites/default/files/2000px-hydroelectric_dam.svg_.png
https://shared.uoit.ca/shared/faculty-sites/sustainability-today/Images/Blog/2014/hydropower-plant.jpg

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A typical hydro plant is a system with three parts: an electric plant where the electricity is produced, a dam that can be opened or closed to control water flow, and a reservoir where water can be stored. The water behind the dam flows through an intake and pushes against blades in a turbine, causing them to turn. The turbine spins a generator to produce electricity. The amount of electricity that can be generated depends on how far the water drops and how much water moves through the system.