Energy embodied in natural resources (e.g., coal, crude oil, sunlight, uranium) that has not undergone any anthropogenic conversion or transformation.
The amount of energy produced from an energy source before losses through conversion processes and transmission (see consumer energy and conversion efficiency).
Energy source provided by nature (e.g. solar energy, wood, coal, petroleum, natural gas).
Energy that has not undergone transformation. Sources of primary energy that can be transformed into electricity and heat include crude oil, coal, natural gas and water used to generate hydroelectric power.
The energy that is embodied in resources as they exist in nature (e.g., coal, crude oil, natural gas, uranium, or sunlight); the energy that has not undergone any sort of conversion.
energy carrier to be found in nature (e.g. solar energy, wood, coal, petroleum, natural gas).
The available energy content of a natural resource. Contrasts with secondary energy.
Energy sources that exist directly in nature, such as coal (lignite, anthracite), petroleum, natural gas and renewable energy sources (e.g. sun, wind). Primary energy is converted into usable energy (electricity, fuel) in power plants, refineries or via other technical processes.
Primary energy is energy contained in raw fuels and any other forms of energy received by a system as input to the system. The concept is used especially in energy statistics in the course of compilation of energy balances.