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Energy resources can be classified into three categories: Renewable: Resources that can be replenished through natural or human efforts, or have inexhaustible reserves. Examples include wind energy, geothermal energy, and photovoltaics. Fossil: Resources that come from dead plants and animals. Fossil fuels are a type of fossil energy resource, and are typically categorized as coal, oil, and natural gas. Nuclear: A type of energy resource.
Energy resources can also be classified as conventional or non-conventional: Conventional: Energy resources that have been used for a long time, such as coal, petroleum, and fuel. Conventional sources are non-renewable. Non-conventional: Energy resources that are considered modern, such as solar energy, tidal energy, and wind energy.
Non-renewable energy uses up resources that cannot be recreated. Examples include gas and coal.
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