The energy contained in a fuel before it is processed.
Primary-energy Sentence Examples
Service sector energy consumption by fuel, in primary energy consumption by fuel, in primary energy equivalents, 1970 to 2003.
SUMMARY Ninety percent of our primary energy comes from CO2 producing fossil fuels.
Although solar power is an alternative source of clean energy, there are many challenges that still stand in the way of it being used on a wide enough scale to actually replace the use of fossil fuels as a primary energy source.
This system takes over as the primary energy source, however using a more efficient fuel system than in the past.
The body's primary energy source is glucose, a simple sugar resulting from the digestion of foods containing carbohydrates (primarily sugars and starches).