• For Darpa, the support for algae is part of a broader mission for the US military to obtain half of its fuel from renewable energy sources by 2016. That time line meant that the Pentagon needed to develop technologies to make its hardware “fuel agnostic”, capable that is of running on any energy source including methane and propane.
  • The US Air Force wants its entire fleet of jet fighters and transport aircraft to test-fly a 50-50 blend of petroleum-based fuel and other sources – including algae – by next year.

Defense Advanced Research Projects Agency (Darpa) that helped to develop the internet and satellite navigation systems, has taken industry insiders by surprise. A cheap, low-carbon fuel would not only help the US military, the nation’s single largest consumer of energy, to wean itself off its oil addiction, but would also hold the promise of low-carbon driving and flying for all.

Darpa’s research projects have already extracted oil from algal ponds at a cost of $2 per gallon. It is now on track to begin large-scale refining of that oil into jet fuel, at a cost of less than $3 a gallon, according to Barbara McQuiston, special assistant for energy at Darpa.

“Darpa has achieved the base goal to date,” she said. “Oil from algae is projected at $2 per gallon, headed towards $1 per gallon.”

McQuiston said a larger-scale refining operation, producing 50 million gallons a year, would come on line in 2011 and she was hopeful the costs would drop still further – ensuring that the algae-based fuel would be competitive with fossil fuels. She said the projects, run by private firms SAIC and General Atomics, expected to yield 1,000 gallons of oil per acre from the algal farm.

Unlike corn-based ethanol, algal farms do not threaten food supplies. Some strains are being grown on household waste and in brackish water. Algae draw carbon dioxide from the atmosphere when growing; when the derived fuel is burned, the same CO2 is released, making the fuel theoretically zero-carbon, although processing and transporting the fuel requires some energy.

Source: The Observer