US energy use drops in 2008

LIVERMORE, Calif. – Americans used more solar, nuclear, biomass and wind energy in 2008 than they did in 2007, according to the most recent energy flow charts released by the Lawrence Livermore National Laboratory. The nation used less coal and petroleum during the same time frame and only slightly increased its natural gas consumption. Geothermal energy use remained the same.

The estimated U.S. energy use in 2008 equaled 99.2 quadrillion BTUs (“quads”), down from 101.5 quadrillion BTUs in 2007. (A BTU or British Thermal Unit is a unit of measurement for energy, and is equivalent to about 1.055 kilojoules).

Energy use in the industrial and transportation sectors declined by 1.17 and 0.9 quads respectively, while commercial and residential use slightly climbed. The drop in transportation and industrial use – which are both heavily dependent on petroleum – can be attributed to a spike in oil prices in summer 2008.

…The chart also shows the amount of energy rejected by the United States. Of the 99.2 quads consumed, only 42.15 ended up as energy services. Energy services are “things that make our lives better,” Simon said. “That’s the energy that makes your car move and that comes out of your light bulb.”

The ratio of energy services to the total amount of energy used is a measure of the country’s energy efficiency. The remainder, explained Simon, “is simply rejected. For example, some rejected energy shows up as waste heat from power plants.”

EurekAlert