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Americans used more solar, nuclear, biomass, and wind energy, and less coal and petroleum in 2008 than in 2007. Natural gas consumption rose slightly and geothermal remained the same. This according to the Lawrence Livermore National Laboratory. (The schematic is informative and you can see a bigger image in pdf.)
Estimated 2008 US energy use equaled 99.2 quadrillion British Thermal Units, or 99.2 quads, down from 101.5 quads in 2007. The bare bones of the resuls:
Of the total 99.2 quads consumed in 2008, less than half—only 42.15 quads—ended up as useful energy that does things like move your light your lamps. The rest is known as rejected energy and does useless and counterproductive things like make waste heat from power plants.
Clearly we have a long way to go on the rejected energy front and should move on that as fast as possible.