Hydropower is the single largest source of renewable energy in the U.S. Combined, renewable sources produce about 12% of the United States' energy.
To generate hydroelectricity, a dam is built across a body of moving water, allowing water to flow through and rotate a turbine that generates electricity.
Knowing your own energy source and its ecological cost can help you decide where to focus your own actions to make the biggest difference.
While hydropower is renewable, it does not mean that dams are good for the environment; there are ecological costs associated.
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