It is likely that the energy to power your car came from the Sun hundreds of millions of years ago and was converted by algae into simple sugars that eventually was pumped out of the ground as crude oil. Is it possible to shorten this cycle into a few weeks or even days and power our economy by cultivating algae today? Many people are betting that we will, as more and more investments are made in algal biofuel companies.

Why the interest in algae? The primary reasons is it grows fast, very fast. In fact, with ample sunlight, CO2 and the right nutrients, algae can double it’s mass in a few hours. And under the right conditions, algae can also be coaxed into producing a large percentage of its mass into fuel rich lipids. With no need to reach toward the sky algae spends little to no energy building the complex cellulosic structures found in land plants. This means a higher percentage of the plant can be converted to fuel. Some companies are focusing on genetically altering fast growing strains to directly produce hydrocarbons, in effect, eliminating the refining step.

Today companies are able to produce biofuel from algae for somewhere between $9 and $36 per gallon. Not barrel, per dollar. Huh? Yes, algal biofuel science still has some work to do. Algae grown in ponds get a free source of energy from the sun, but require a lot of water and the associated energy costs of moving it around and filtering the final product. These open ponds also have to be protected from natural strains which do not produce the desired lipids. Closed bioreactors are great at controlling the environment and preventing contamination, but require a lot of energy either via artificial light or in the case of GreenFuel, sugar.

Algae has advantages in addition to its ability to grow quickly. Acre per acre, algae outperforms any other biofuel source around. Compared to 60 gallons of diesel per acre from soybeans or 600 gallons per acre from oil palms, algae can produce 1850 gallons per acre and some experts are claiming 5,000 gallons per acre is feasible.

Algae also consumes a vast amount of CO2 and produces lots of oxygen. Three quarters of the oxygen in our atmosphere is produce by algae. Experimental sites are often located at coal fired utility plants in order to use the vast amounts of CO2 produces by burning coal to feed the algae. While this certainly does not sequester the CO2, it lowers the total emissions by recycling the CO2 and gaining energy from it twice.

There are forms of algae that grow in lots of types of water that we would find difficulty using for ourselves or our food supplies. This allows algae farms to use water that will not impact scarce water sources. These add up to a crop that can be grown on land not used for food, using water that would not be used for human consumption or food crops and suck up a lot of CO2 in the process. We simply have to find ways to do it more cheaply.

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