Energy sources produced from primary energy resources, such as refined fuels or electric power.

Natural sources from which power is obtained.

Materials or phenomena which can provide energy directly or via conversion.

Synonyms: Primary Energy Resource, Energy Generating Resources, Secondary Energy Resource, Resource, Secondary Energy, Resources, Primary Energy, Energy Resources, Secondary, Energy Resources, Primary, Resources, Secondary Energy, Energy-Generating Resources, Resources, Energy-Generating, Secondary Energy Resources, Primary Energy Resources, Energy Resource, Secondary, Resource, Primary Energy, Energy-Generating Resource, Energy Resource, Primary, Resource, Energy-Generating