Biofuel of tomorrow

An alternative process to produce bio-ethanol from algae is being developed by the company Algenol. Rather than grow algae and then harvest and ferment it the algae grow in sunlight and produce ethanol directly which is removed without killing the algae. It is claimed the process can produce 6000 gallons per acre per year compared with 400 gallons for corn production.^[19]


1) algae: 6000 gallons/acre/yr x $2/gallon x 150 acre = $1.8M/ year at  900K gallons of ethanol yield
2) corn: 370 gallons/acre/yr x $2/gallon x 150 acre = $111K/year at 55K gallons of ethanol yield
3) sugarcane: 890 gallons/acre/yr x $2/gallon x 150 acre = $267K/year at 133.5K gallons of ethanol yield 
src: http://en.wikipedia.org/wiki/Algenol

From Economist: Ethanol's mid-life crisis, Sep 2010

T IS what passes for a winter’s day in upstate São Paulo. The sun is blazing from a blue sky feathered lightly with cirrus cloud. In a large, sloping field overlooking the city of Piracicaba, a mechanical harvester chomps through a stand of three-metre-high sugar cane, fat and juicy from months of sunshine. The harvester slices the cane into 20cm chunks and regurgitates them into a 30-tonne trailer moving alongside that will lug them a few kilometres to the Costa Pinto mill (pictured). There the cane is weighed, washed, tipped onto a conveyor belt, crushed and then, depending on market conditions, crystallised into sugar or distilled into ethanol. The woody residue—the bagaço—is burned in two high-pressure boilers that, according to the flickering needle in the control room, are supplying around 50 megawatts (MW) of electricity to the local grid—enough to power half of Piracicaba.

Sugar has been grown in Brazil for 500 years, and the country is by far the world’s biggest exporter of it. But sugar now also forms the nucleus of a new agro-industrial and renewable-energy complex. Biofuels, mainly derived from sugar, are Brazil’s most important source of energy after oil. For a unit of energy, the production and use of sugar-based ethanol generates only two-fifths of the carbon emissions of petrol, and half those of corn-based ethanol, according to the United States Environmental Protection Agency. And bioplastics made from sugar cane are poised to move from the laboratory to the corner store, with the launch of soft-drink bottles.