Renewable energy sources are energy sources that can be replenished quickly.

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Renewable energy sources replenish naturally in a short time, so the energy they provide can be drawn again and again without running out on human timescales. Sunlight, wind, and flowing water continually renew their energy, which is why these sources can be used to generate electricity repeatedly. This makes the statement that they can be replenished quickly the best description. The other ideas—being finite, unable to be used for electricity, or depending on fossil fuels—don't fit with how renewables work in practice.