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Posts tagged “Mascoma”

By Robert Rapier on Oct 8, 2009 with no responses

What Happened to a Buck a Gallon?

Coskata will produce ethanol for under US $1.00 a gallon anywhere in the world, from almost any input material. – Coskata Vision Statement A bit more than a year ago, I read a number of claims from ethanol start-up Coskata stating that they would be able to produce ethanol from cellulose for less than $1.00 a gallon. One thing that is very important to me as an engineer is that you deliver what you say you will deliver – or more. If you deliver less, you lose credibility. If it becomes a habit, you lose all credibility. I am not a fan of hype, and I don’t like my tax dollars funding hype. So when I think someone is overly… Continue»

By Robert Rapier on Mar 12, 2009 with no responses

About That Logistics Problem

In 2006 I warned about just how many trees a cellulosic ethanol plant could consume: Cellulosic Ethanol Reality Check Let’s consider a typical mid-sized 50 million gallon per year ethanol plant. Using Iogen’s demonstrated yields, the biomass requirement would be 50 million/70 = 714,286 tons of biomass per year. According to Dr. Bruce Marcot, an ecologist at the USDA Forest Service the average Douglas fir yields about 1660 lbs of pulp (90% of the tree’s weight). So, to run a mid-sized cellulosic ethanol facility would require the equivalent of 714,286 tons * 2000 lbs/ton /(1660) or 860,585 Douglas firs PER YEAR. That’s a lot of biomass, and it puts into perspective the issue of a declining EROEI as biomass must… Continue»