Run Cars on Green Electricity, Not Natural Gas

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With the dramatic increase in oil prices earlier this year translating into higher prices at the gas pump in the United States, concerns over U.S. dependence on foreign oil are once again part of the national discussion on energy security. Combined with the growing understanding that carbon emissions from the combustion of fossil fuels are driving global climate change, the debate is now focused on how to restructure the U.S. transport system to solve these two problems. While the idea of running U.S. vehicles on natural gas has lately received a great deal of attention, powering our cars with green electricity is a more sensible option on all fronts — national security, efficiency, climate stabilization and economics.

Having a fleet of natural gas–powered vehicles (NGVs) would simply replace U.S. dependence on foreign oil with a dependence on natural gas, another fossil fuel. The United States has scarcely 3 percent of the world’s proved natural gas reserves, yet even without the increased demand that would result from an NGV fleet, the country already consumes nearly a quarter of the world’s natural gas. At current rates of consumption, U.S. proved reserves would only meet national demand for another nine years.

U.S. natural gas production has remained relatively constant over the last two decades and is unlikely to increase over the long run, despite growing consumption. Consequently, any rise in demand is likely to be met by increasing imports. Since the late 1980s, U.S. net imports of natural gas—primarily from Canada—have tripled. The U.S. Department of Energy projects that by 2016 the majority of U.S. natural gas imports will come from outside North America.

With Russia and Iran topping the list of countries with the largest proved reserves of natural gas, a growing reliance on imports would increase the strategic vulnerability of the United States. These two nations — which along with 14 others collectively control nearly three fourths of the world’s natural gas reserves — are members of a Gas Exporting Countries Forum that was established in 2001. While there is no direct evidence that these countries are seeking to form a natural gas cartel, at the Forum’s 2005 annual meeting they discussed how to maintain a satisfactorily high natural gas price. For more natural gas production and consumption statistics, see the tables listed on the EPI Web site.

Just like oil, natural gas is a finite, nonrenewable resource. This means that switching to a fleet of NGVs would be at best a short-term fix. As natural gas becomes more difficult to obtain and more costly, a fleet of NGVs and the 20,000 or so natural gas refueling stations that would be required to support them would simply be abandoned.

A better investment is one that supports a fleet of plug-in hybrid electric vehicles (PHEVs), such as the Chevy Volt slated for sale in 2010, which can use the existing electric infrastructure. A study by the U.S. Department of Energy’s Pacific Northwest National Laboratory found that if all U.S. automobiles were PHEVs, the current U.S. infrastructure could provide power for more than 70 percent of the fleet. Battery charging would occur mostly at night, when demand for electricity is low. In the emerging energy economy — an economy built on domestic wind, solar and geothermal energy sources — the greening of the grid by replacing fossil fuel–based electrical generation will also be a greening of the transport system. Beyond the grid, distributed power systems — solar cells on rooftops, for example — could also be used to power PHEVs.

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