First, despite big gains in energy efficiency and increases in “renewables” (wind, solar, biofuels), fossil fuels will remain the mainstay of America’s energy system for years. In 2010, fossil fuel represented 83 percent of U.S. energy consumption, with oil at 37 percent, natural gas at 25 percent and coal at 21 percent. Although total energy use grows only 10 percent between 2010 and 2035, the fossil-fuel share stays high at 77 percent in 2035. Oil is 32 percent, natural gas 25 percent and coal 20 percent.
We’ve become vastly more efficient. In 2010, it took about half the energy to produce a dollar’s worth of output (gross domestic product) as in 1980. The EIA expects these trends to continue; energy use per dollar of GDP is projected to drop 42 percent from 2010 to 2035.
Meanwhile, domestic energy production is rising and — astonishingly — import dependence is rapidly falling. In 2010, oil imports accounted for 49 percent of U.S. consumption, down from 60 percent in 2005. By 2035, imports could decline to 36 percent, projects the EIA.
But we don’t view energy this way. We clamor for grander goals: becoming energy “independent” or stopping global warming. And these — as the EIA report also shows — are unreachable anytime soon, if ever. Barring vast new discoveries, we won’t produce enough oil to meet our needs. Indeed, the EIA’s assumption about biofuels, which roughly triple by 2035, could be too optimistic. If so, oil imports would exceed EIA projections. (In 2035, the EIA expects biofuels to account for 12 percent of liquid fuel use, up from 4 percent in 2010.)
The same is true of global warming. It’s hard to see how, under plausible assumptions, greenhouse gas emissions could be reduced substantially in the foreseeable future. The pressures of population and economic growth overwhelm improved energy efficiency or shifts to “green” energy. For example, renewable fuels (wind, solar, geothermal, biomass) are projected to more than double by 2035. Still, including hydropower, they account for only 16 percent of electricity generation in 2035. Coal and natural gas dominate. In 2035, emissions of carbon dioxide — the largest greenhouse gas — are reckoned to be 3 percent higher than in 2010. This contrasts with the declines of 50 percent to 80 percent by midcentury that some scientists say are needed to stabilize global temperatures.
A brighter energy future?pdf: EIA - Annual Energy Outlook 2012
The oil barrel is half-full.