Are Algae Biofuels a Realistic Alternative to Petroleum?

Researchers at the Pacific Northwest National Laboratory have found that nearly 14 percent of land in the continental United States, or roughly the combined area of Texas and New Mexico, could be used for converting algae to transportation fuels.

In 2008, the U.S. Department of Energy estimated that for algae fuel to replace all the petroleum fuel in the U.S., it would require about 30,000 square kilometers of land, or about half the land area of South Carolina. Therefore, this finding illustrates the potential of algae-based fuels, and for that matter, the potential any alternative energy source that requires vast amounts of land.

“Our main driver was to look at how much land would be available for installing large algae pond systems,” said Dr. Erik Venteris, a spatial modeling engineer at the Pacific Northwest National Laboratory and the lead investigator of the study.

Algae pond facilities require between 1,000 and 1,200 acres of land for one facility, said Venteris. The facilities he envisions would hold up to one million gallons of algae biodiesel per facility.

Where the 14 percent of available land is located is a major concern, however, according to Dr. Richard Nelson, a professor in the Center for Sustainable Energy at Kansas State University. This number includes low-slope, non-protected land. Much of the desert land in Arizona and other parts of the southwest are flat and available, but the amount of infrastructure and resources available in these areas remains a question mark.

Venteris’s study took into account not only areas that were currently available with a low-slope, but also areas that would be cheap to purchase from their current owners.

“The first candidates that I think about are where we have agricultural land that is no longer productive,” said Dr. Stephen Mayfield, the director of the University of California, San Diego’s Algae Center for Biotechnology.

Mayfield said there is tons of agricultural land sitting idle because it has been “salted out” of production. These unproductive lands would be more valuable holding algae facilities, and Mayfield cites California’s Imperial Valley as a good site for algae ponds since its only current use is storing agricultural runoff, and algae can grow in both ocean and wastewater. However, lands in California have some of the highest prices of acquisition, according to Venteris’s study.

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The cheapest land that Venteris found was the arid lands in the West, but two types of land stood out to him as good contenders for algae biofuel facilities: marginal croplands and southern woodlands.

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