The main difference between renewable and nonrenewable energy sources is that renewable energy sources are those which can be replenished in a relatively short amount of time, while nonrenewable energy sources are those which take a much longer time to replenish. Examples of renewable energy sources include solar, wind, and hydro power, while examples of nonrenewable energy sources include coal, oil, and natural gas. Renewable energy sources are considered to be more sustainable than nonrenewable sources, as they have less of an impact on the environment.