Lessons from "Global Warming" Panic

Here is a post by Geoffrey Styles from the Energy Outlook website. Here is the key bit:

Energy efficiency and high energy returns on energy invested are essential to producing competitive biofuels in a way that avoids the trap the US corn ethanol industry fell into in 2008. Ethanol producers didn't benefit nearly as much from last year's high oil prices as they--and their investors--expected, because the rising cost of the large energy inputs required to make corn ethanol rose in tandem with the price of the fuels it was supposed to displace. This is an example of what some analysts call the Law of Receding Horizons. After factoring in the cost of natural gas-based nitrogen fertilizer, diesel-powered cultivation and harvesting, and gas-fueled distillation, the relatively small energy surplus created wasn't worth enough to make the operation profitable, even at the highest oil price in history.

When the end-of-the-world crazies rush off demanding carbon reductions or substituting ethanol for gasoline, they haven't done their homework. The above quote shows this.

Rather than solve the problem by "mandate" (that was the old Soviet model of a demand economy and you know how well that worked!), there is a need to build technology to move the world into a post-carbon world. We can already see the outlines of it. But rather than get there by dictat, we need to get there by incentives and market forces. The former will impoverish us all, the latter may actually deliver us to a better world.

Go read the article and you will see what Brazil is doing to avoid the trap that American ethanol plants fell into. Specifically:

Amyris's concept breaks out of this trap in several ways. First, by starting with sugar cane in the tropics, it avoids the large energy inputs associated with crop fertilizer. The article points out two other key benefits: Brazilian sugar/ethanol mills are net energy producers, not consumers, by virtue of capitalizing on the energy content of the waste left over from the grinding and fermentation process. In addition, while the ethanol produced by traditional fermentation is water soluble, requiring a lot of energy to separate the two, the molecules produced by the company's tailored microbes are not; the diesel precursors separate from water at little additional energy penalty.

The advantages of this approach continue after production, because of the properties of the fuel. Although it is possible to build engines that capitalize on ethanol's high octane and other properties to deliver fuel economy that nearly matches gasoline, the vast majority of the ethanol produced today will be burned either as a 10% blend in conventional cars or as a higher mix in flexible-fuel vehicles that must still be able to operate reliably on gasoline. That precludes the modifications that would compensate for ethanol's 33% lower energy content, compared to petroleum gasoline. Producing biodiesel instead of ethanol puts the fuel into engines that can take full advantage of its environmental properties, while yielding a roughly 30% fuel efficiency gain versus gasoline--and thus roughly twice the fuel economy of ethanol. Amyris claims that its biodiesel would be fully compatible with petroleum diesel, creating a significant advantage over biodiesel produced from soybeans, canola (rapeseed), and other vegetable oils. These so-called FAME biodiesels can normally only be used in blends of less than 5-10% in petro-diesel, to protect the sensitive fuel injection mechanisms of modern diesel engines.

There's no free lunch, of course. Part of diesel's advantage comes from its higher energy content, compared to either gasoline or ethanol, and the energy in the quantity of cane that would produce 100 gallons of ethanol could only yield around 60 gallons of diesel. However, when you burn these fuels in real cars--such as the VW Jetta that is available in both gasoline and diesel versions--the ethanol would take you around 1,650 miles, while the smaller quantity of diesel would be good for nearly 2,000 miles. That 20% improvement results from the higher efficiency of compression ignition engines over spark ignition.