In 2005, President George W. Bush and American corn farmers saw corn ethanol as a promising fossil fuel substitute that would reduce both American dependence on foreign oil and greenhouse gas emissions. Accordingly, the 2005 energy bill mandated that 4 billion gallons of renewable fuel be added to the gasoline supply in 2006. That rose to 4.7 billion gallons in 2007 and 7.5 billion in 2012.
Since then, life cycle assessments (LCAs) have shown that corn ethanol has modest if any effect on reducing CO2 emissions and may actually increase them, while posing a threat to natural habitats and food supplies, as food stocks are turned to fuel and marginal lands are put under the plough to keep up with demand. In 2010, fuel ethanol consumed 40 percent of U.S. corn production, and 2012 prices are at record highs. Since the U.S. also accounts for 40 percent of the world's corn, U.S. ethanol production has affected corn prices around the planet.
As electric vehicles (EVs) increasingly enter the market and charging stations are built to serve them, EVs are competing with alternative-fuel vehicles. Using electricity generated by coal-fired plants to power the cars defeats the purpose to some extent, but what if the energy comes from the ultimate clean and renewable source – the sun itself? How would that compete with ethanol in terms of land use, life-cycle emissions, and even cost?
The question, says UCSB Bren School of Environmental Science & Management Professor and LCA expert Roland Geyer, is which makes more sense, growing fuel crops to supply alternative-fuel vehicles with ethanol and other biofuels or using photovoltaics (PV) to directly power battery electric vehicles (BEV)?
"The energy source for biofuels is the sun, through photosynthesis," he says. "The energy source for solar power is also the sun. Which is better?"
To find out, Geyer joined former BrenSchool researcher David Stoms and James Kallaos, of the Norwegian University of Science and Technology, to model the relative efficiencies of the technologies at converting a given amount of sunlight to miles driven.
The results, which appear in a paper titled "Spatially Explicit Life Cycle Assessment of Sun-to-Wheels Transportation Pathways in the U.S." and published in the Dec. 26 issue of the journal Environmental Science & Technology, showed photovoltaics (PV) to be much more efficient than biomass at turning sunlight into energy to fuel a car.
"PV is orders of magnitude more efficient than biofuels pathways in terms of land use – 30, 50, even 200 times more efficient – depending on the specific crop and local conditions," says Geyer. "You get the same amount of energy using much less land, and PV doesn't require farm land."
The researchers examined three ways of using sunlight to power cars: a) the traditional method of converting corn or other plants to ethanol; b) converting energy crops into electricity for BEVs rather than producing ethanol; and C) using PVs to convert sunlight directly into electricity for BEVs.
Because land-use decisions are local, Geyer explains, he and his colleagues examined five prominent "sun-to-wheels" energy conversion pathways – ethanol from corn or switchgrass for internal combustion vehicles, electricity from corn or switchgrass for BEVs, and PV electricity for BEVs – for every county in the contiguous United States.
Focusing the LCA on three key impacts – direct land use, life cycle greenhouse gas (GHG) emissions, and fossil fuel requirements – the researchers identified PV electricity for battery electric vehicles as the superior sun-to-wheels conversion method.
"Even the most efficient biomass-based pathway…requires 29 times more land than the PV-based alternative in the same locations," the authors write. "PV BEV systems also have the lowest life-cycle GHG emissions throughout the U.S. and the lowest fossil fuel inputs, except in locations that have very high hypothetical switchgrass yields of 16 or more tons per hectare."
PV conversion also has lower GHG emissions throughout the life cycle than do cellulosic biofuels, even in the most optimistic scenario for the latter. "The bottleneck for biofuels is photosynthesis," Geyer says. "It's at best 1-percent efficient at converting sunlight to crop, while today's thin-film PV is at least 10-percent efficient at converting sunlight to electricity.
Finally, while cost was not a key component of the study, Geyer says, "The cost of solar power is dropping, and our quick calculations suggests that with the federal tax credit, electric vehicles are already competitive."
What does this mean for the future?
“What this research taught me is that biomass is simply not a good way of harvesting sunlight,” Geyer explains. “Not because of immature technologies but because of a fundamental physical constraint, the inefficiency of photosynthesis. This fundamental disadvantage will just get worse as PV-powered EVs are getting cheaper and more efficient in the years to come. A search for a silver bullet is under way in energy research, be it artificial photosynthesis or third-generation biofuels. But if there is a silver bullet, I think it is photovoltaics.”
University of California - Santa Barbara: http://www.ucsb.edu
This press release was posted to serve as a topic for discussion. Please comment below. We try our best to only post press releases that are associated with peer reviewed scientific literature. Critical discussions of the research are appreciated. If you need help finding a link to the original article, please contact us on twitter or via e-mail.
Manmade warming in past decade has likely been offset by cooling from natural cycles in the Pacific and Atlantic - but effect will reverse in coming decades
A devastating disease that has wiped out amphibians around the world has been discovered in Madagascar, scientists report.
The Oklahoma Republican, who chairs the Senate Environment and Public Works committee, has long argued climate change is a "hoax"
Warmer temperatures in Alaska are giving farmers flexibility to plant a wider range of crops over a longer growing season. One farmer says the secret to his bounty is soil enriched by flooding rivers.
The canal would allow passage for the largest ships on the water, but cut through wetlands, forests and the region's largest freshwater lake — and environmentalists worry about the consequences.
The results of the UK government's first auction for renewable energy subsidies are a boost for offshore wind, with solar the biggest loser.
Over half of India's population lives in areas with dangerous levels of air pollution. Now that has been translated into years of life lost overall
For the first time, a satellite has calculated the whopping amount of Saharan dust that is blown over the ocean to reach the Amazon rainforest every year
A vast electric fence is being erected around Mount Kenya, one of the world's great refuges for wildlife. Will it help people and animals coexist?
The world's national parks and nature reserves receive eight billion tourist visits a year, generating around $600bn of spending, according to research.