Renewable energy is defined as

• A. a repeatable source of energy
• B. energy that is not renewable
• C. a non-renewable resource
• D. energy generated by non-renewable fuels

Answer: (A)

Renewable energy comes from sources that can be replenished naturally and used again and again. The best description is a repeatable source of energy, meaning these sources won’t run out on human timescales. Think of sunlight, wind, flowing water, geothermal heat, and biomass—these are continually available or replenish themselves. The other ideas describe energy that isn’t renewable or relies on finite resources, which is opposite to what renewable energy means.