The term, renewable energy, refers to several energy sources that share
one characteristic: they all produce electrical, thermal or mechanical
energy without unnecessarily depleting resources. The renewable energy sources are generally classified as water, biomass, wind, solar, earth and energy from wastes. (Note: "water" usually means hydroelectric energy, while "earth energy" means using heat stored in underground rocks and water.)
The term, renewable energy, refers to several energy sources that share
one characteristic: they all produce electrical, thermal or mechanical
energy without unnecessarily depleting resources. The renewable energy sources are generally classified as water, biomass, wind, solar, earth and energy from wastes. (Note: "water" usually means hydroelectric energy, while "earth energy" means using heat stored in underground rocks and water.)