Lasted edited by Andrew Munsey, updated on June 14, 2016 at 9:33 pm.
Researchers at the University of California at Berkeley have engineered a strain of green microalgae that could, with further refinements, produce vast amounts of hydrogen through photosynthesis. The breakthrough also could have application in a wide range of products, from biodiesel to cosmetics. Present efficiency is at around 30 cents / kW-h. In 2000, when the technology was first announced, they were at 300 cents / kW-h.
Theoretical optimum is at 3 cents / kW-h. This is based on observation of normal photosynthesis processes. It is also based on a marketing model of on-site hydrogen production and conversion to electricity, not requiring hydrogen storage and transport.
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