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President Obama's plan to move quickly to replace fossil fuels with renewable energy sources relies on technology that analysts agree is neither affordable nor available on a commercial scale and won't be for many years to come.
Expensive, small-scale pilot projects are under way that convert vegetation into fuel for cars and capture carbon dioxide before it is released into the air from coal-burning power plants. But these prototypes have not been proved at levels that would make even a dent in the U.S. appetite for fossil fuels, casting doubt on the viability of the president's plans.
Still, the administration continues to promote policies that assume that these pilot programs will soon become large-scale projects and is seeking funds to bring that day closer.
"It's promoting a vision that no one knows what the true cost will be and [whether] these technologies will succeed on a large scale," said Bryan K. Mignone, a climate and energy analyst at the liberal-leaning Brookings Institution.
"The administration wants a solution fast to the technology problems," said Nathaniel Greene, director of renewable-energy policy for the Natural Resources Defense Council.
But a solution might not emerge as rapidly as the administration would like. Mr. Greene said energy specialists joke that the "next generation" of biofuels is five years away from commercial use - and has been that way since the 1980s. Despite some promising breakthroughs in ethanol, he said, it will be years before the next-generation fuels are widely available.
It also will be years before commercial-scale "carbon capture and sequestration" technology will be cheap enough to take carbon dioxide from smokestacks and pump it into underground storage sites. The most recent estimates suggest that such technology would not be ready for initial commercial use until 2015 and not widely in use before 2025.
Some critics say the climate legislation drafted by Democrats and pending in the House would kill the push for carbon capture and sequestration by allowing older power plants to buy their way out of upgrading their facilities by purchasing permits to emit higher levels of carbon while using existing technology.
The administration's stated goal is to end the nation's dependence on oil from the Middle East and Venezuela by 2020 and to cut greenhouse-gas emissions by 20 percent, or to 1990 levels, by the same year. Next-generation ethanol and carbon capture and sequestration are key to achieving those goals -- that is, once the technology is developed.
The administration can force the technology forward and alter carbon methods by sending price signals to polluters, said Daniel J. Weiss, a clean-energy and climate specialist at the liberal Center for American Progress. He said the imposition of a carbon fee would shave years off the time it would take to produce commercial-scale ethanol and carbon-capture technology.










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