Large Scale Hydro
According to the US Department of Energy, “large hydropower” refers to facilities that have an energy generation capacity of more than 30 megawatts. Unlike small scale hydro, large facilities are typically more capital-intensive, requiring the construction of some, if not all of the following: dam, impoundment, powerhouse, and transmission lines. They also have a more significant environmental impact, as they alter the river’s natural flow. However, once they are built, large hydropower plants have virtually no fuel costs or greenhouse gas emissions, nor do they pollute the water or air.
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