Energy from sources that are constantly being formed.

Uses the Sun's energy to heat something directly.

Energy from the Sun can be gathered by collectors and used to heat water or to heat a building.

Plant material, manure, and any other organic matter that is used as an energy source.

Energy produced from moving water, which accounts for about 20% of the worlds electricity.

Energy from heat in the Earth's crust.

Energy sources that are still in development.

The use of temperature differences in ocean water to produce electricity

Produces electricity chemically by combining hydrogen fuel with oxygen from the air.

Percentage of energy put into a system that does useful work.

Process of saving money by reducing energy and waste

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