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Alternative energy is typically defined as coming from sources that do not deplete natural resources or harm the environment. Wind power is a typical example. The term alternative is used to contrast with fossil fuels according to some sources. Renewable energy differs from Alternative energy in that it may have significant environmental impact, as is the case for most hydroelectric dams.
Renewable energy is energy generated from natural resources—such as sunlight, wind, rain, tides and geothermal heat—which are renewable (naturally replenished). Renewable energy technologies include solar power, wind power, hydroelectricity, micro hydro, biomass and biofuels.
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