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Hydropower is the most efficient way to generate electricity. Modern hydro turbines can convert as much as 90% of the available energy into electricity. The best fossil fuel plants are only about 50% efficient. In the U.S., hydropower is produced for an average of 0.85 cents per kilowatt-hour (kwh).

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hy·dro·e·lec·tric

/ˌhīdrōəˈlektrik/

adjective

1. relating to or denoting the generation of electricity using flowing water (typically from a reservoir held behind a dam or other barrier) to drive a turbine that powers a generator.

2. "economic and environmental aspect of the hydroelectric scheme"

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How Hydropower Works | Wisconsin Valley Improvement Company

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1. A dam raises the water level to make it like a waterfall

2. The  water hits a turbines blades at the end of the waterfall.
3. The turbine turns the kinetic energy from the water into mechanical energy.
4. A generator is wired to the blades of the turbine so if they spin so does the generator. The generator then turns the mechanical energy into electricity.
5. Transmission lines from the generator conduct electricity into homes and buildings.