Home > Encyclopedia of Science > Alternative Energy Sources

• Current sources of energy
• Words to Know
• Nuclear power
• Water power
• Wind power
• Solar power
• Geothermal energy
• Tidal and ocean thermal energy
• Biomass energy
• Other sources of alternative energy
• Energy conservation

Alternative energy is energy provided from sources other than the three fossil fuels: coal, oil, and natural gas. Alternative sources of energy include nuclear power, solar power, wind power, water power, and geothermal energy, among others.