Fuels from Wood and Waste not Food and Haste

By John Addison (7/3/07) Americans are screaming for lower gasoline prices. In São Paulo, Brazil, the price of gasoline is R$2.43/liter, ethanol is only R$1.48/liter, disclosed Brazil’s National Petroleum Agency. Brazil has reduced its petroleum dependency by 40% with sugarcane ethanol.

The United States and Brazil together produce about 90 percent of global fuel ethanol. In the United States the current benefits of ethanol are far behind Brazil.

“Thanks in large part to the Renewable Fuels Standard (RFS)—a legislative mandate for increased renewable fuels use that passed as part of the Energy Policy Act of 2005—the corn ethanol industry is expanding at an unprecedented rate in the United States. The 115 ethanol plants operating in April 2007 have the capacity to produce 5.75 billion gallons per year (BGY) of ethanol, and an estimated 86 plants under construction are expected to produce an additional 6.34 BGY of capacity within the next 18 months (RFA, 2007). The cumulative total capacity—more than 12 BGY by 2009—far exceeds the RFS blending mandate of 7.5 BGY by 2012, and has been the driving force behind skyrocketing corn prices in the last 12 months.” – World Resources Institute

In the United States, ethanol has reduced our petroleum dependency by about 5%. That amount is rapidly increasing. Many states require ethanol as an oxygenating agent in gasoline, replacing MTBE and tetraethyl lead. A growing number of states are requiring that gasoline be sold with a blend of 10% ethanol (E10).

There is a heated debate about whether ethanol helps the environment. If you live in Brazil, the answer is “yes.” In Brazil, ethanol is processed from sugarcane, which produces over eight times more energy than the fossil energy used in its production. In the United States, ethanol is currently produced from corn. Brazil can achieve yields of 2,500 gallons of ethanol per acre. The U.S.; 300 to 500 gallons per acre.

The United States could immediately lower gasoline prices, reduce our need for foreign oil, and lower emissions by importing sugarcane ethanol from Brazil. Instead, we impose a 54 cent per gallon tariff and generally make importation difficult. Instead we subsidize corn ethanol.

There is only a 20% reduction in greenhouse gases, source-to-wheels with corn ethanol in blends of up to E10, because the process of making corn ethanol uses diesel farm equipment, fertilizer from fossil fuel, coal produced electricity, and diesel fuel rail and delivery trucks. Since E10 is 90% gasoline, the blended fuel’s reduction of greenhouse gases is about 2%.

Corn ethanol is controversial. Corn farmers and others betting on high corn prices love it. Enthusiasts of energy independence support it. Some scientists show a net energy gain; some, a loss.

“Abusing our precious croplands to grow corn for an energy-inefficient process that yields low-grade automobile fuel amounts to unsustainable, subsidized food burning,” says the Cornell professor Dr. Pimentel, who chaired a U.S. Department of Energy panel that investigated the economic and environmental impact of ethanol production.

To analyze corn ethanol, one needs to look at corn-to-tank and tank-to-wheels. The real problem is in the tank-to-wheels use in U.S. flex-fuel vehicles (FFV).

If E85 (85% ethanol, 15% gasoline) corn ethanol is used is any of the 6 million GM and Ford flex fuel vehicles on U.S. streets, then greenhouse emissions increase. Most FFVs are fuel guzzlers; fueled with E85, they are corn guzzlers. In 2007 the best rated car running on E85 was the Chevrolet Impala, with a United States EPA mileage rating of 16 miles per gallon in the city and 23 on the highway when fueled with E85. For a typical U.S. year of driving, the annual fuel cost would be at $1,657 and 6 tons of CO2 would be emitted by this FFV when running on E85.

By contrast, the EPA rating for a Toyota (TM) Prius running on gasoline was 60 miles per gallon in the city and 51 on the highway. The Prius would have an annual fuel cost of $833 and only emit 3.4 tons of CO2.
A big problem is that ethanol cuts miles per gallon by about 27%. The energy content of E85 is 83,000 BTU/gallon, instead of 114,000 BTU/gallon for gasoline. To make matters worse, Dr. Pintel calculates that it takes 131,000 BTU to create a gallon of ethanol. Even by 2030, the U.S. Energy Information Administration (EIA) projects that only 1.4% of ethanol use will be E85. The vast majority will be for blending to 10% with gasoline.

The EIA forecasts that ethanol use will grow from 4 billion gallons in 2005 to 14.6 billion gallons in 2030, but only 0.2 billion gallons will be E85 by 2030.

To save gas and help save the planet, pump E10 into a gasoline miser. Don’t pump E85 into a corn guzzler. Although Dr. Pintel’s 2001 finds would also show E10 as a bad idea, U.S. agriculture has improved yields from 300 gallons of corn ethanol per acre to closer to 500 gallons in some areas, in part by using more fertilizer. The problem is now the vehicles, not the ethanol.

U.S. agriculture will be a big winner without any need to spend more tax dollars funding E85 stations, subsidizing corn ethanol, nor by blocking Brazilian ethanol and keeping gasoline prices high. Agriculture will be a bigger winner by growing cellulosic corps with much higher yields per acre than corn.

Large-scale reliance on ethanol fuel will require new conversion technologies and feedstock. Much attention has been focused on enzymes that convert plant cellulose into ethanol. Because cellulose derived ethanol is made from the non-food portions of plants, it greatly expands the potential fuel supply without cutting our precious food supplies. According to a joint study by the U.S. Departments of Agriculture and Energy, the nation has enough biomass resources to sustainably meet well over one-third of current U.S. petroleum needs if cellulosic technologies and resources are employed.”

In the heart of Silicon Valley, Khosla Ventures is funding innovative solutions for clean transportation and other major global problems. Led by Vinod Khosla, they are involved in a number of companies creating cleaner fuels with cellulosic ethanol, biomass gasification and synthetic biology.

Samir Kaul, General Partner with Khosla Ventures, was a keynote speaker at the GreenVest 2007 Conference. Leading venture capitalists were captivated by his thoughts about creating an innovation ecosystem and building a portfolio of cleantech and biotech companies. Samir was a biochemist at Venter’s Institute for Genomic Research (TIGR). Samir Kaul is also a Harvard MBA who successfully founded and built several bioscience companies. With Vinod Khosla, he founded Khosla Ventures.

Samir Kaul sees cellulosic ethanol potential yields of 2,500 gallons per acre. One of Khosla Venture’s portfolio companies is Mascoma, which is innovating in enzymes, organisms and ethanol production processes.

Another Khosla Ventures portfolio company is Range Fuels which sees fuel potential from timber harvesting residues, corn stover (stalks that remain after the corn has been harvested), sawdust, paper pulp, hog manure, municipal garbage, and more that can be converted into cellulosic ethanol. In the labs, Range Fuels has successfully converted almost 30 types of biomass into ethanol. While competitors are focused on developing new enzymes to convert cellulose to sugar, Range Fuels’ technology eliminates enzymes which have been an expensive component of cellulosic ethanol production. Range Fuels’ thermo-chemical conversion process uses a two step process to convert the biomass to synthesis gas, and then converts the gas to ethanol. The U.S. Department of Energy is negotiating with Range Fuels research funding of up to $76 million.

Range Fuels was awarded a construction permit from the state of Georgia to build the first commercial-scale cellulosic ethanol plant in the United States. Ground breaking will take place this summer for a 100-million-gallon-per-year cellulosic ethanol plant that will use wood waste from Georgia’s forests as its feedstock. Phase 1 of the plant is scheduled to complete construction in 2008 with a production capacity of 20 million gallons a year.

Ethanol is not the only bio-game in town. Many European cars and most U.S. heavy vehicles use diesel not gasoline. New generations of biodiesel, biobutanol, and synthetic fuels are being developed that could be blended with diesel or replace it. Some of these fuels could also be blended with gasoline and jet fuel. BP and Dupont have teamed to produce biobutanol.

Amyris and SunEthanol plan to use synthetic biology to develop microorganisms that produce biofuels. Khosla Ventures backed LS9 Inc. is in the early stage of using synthetic biology to engineer bacteria that can make hydrocarbons for gasoline, diesel, and jet fuel. LS9’s acting CEO, Douglas Cameron, is former director of biotechnology research at Cargill and chief scientific officer at Khosla Ventures.

The more that global customers recognize the value of green fuels, the faster will be their replacement of petroleum fuels. Carbon emissions cap-and-trade agreements are being implemented in a growing number of nations and U.S. states. The carbon market is expected to reach $40 billion by 2010. Leading investors and major corporations will convene at the Carbon Finance World this September 18-20, 2007, in Chicago to look at the opportunities.

Future vehicles will get improved mileage and use an increased mix of biofuels and fuels from synthetic biology. Expect to see a high growth of cleaner fuels from woods and waste, not food and haste. Look forward to true source-to-wheels solutions to energy independence and reduction of greenhouse gas emissions.

John Addison publishes the Clean Fleet Report.

7 replies
  1. Nikolei
    Nikolei says:

    If you do a little research you might find that Dr. Pimentel's research has been shown to be pretty erroneous. While corn ethanol is certainly not nearly as efficient as ethanol produced from sugar cane, modern innovations in agricultural production have made ethanol production much more efficient in recent years. Both the National Academies and the US Department of Energy have shown that ethanol yields at least 25% more energy than the energy invested in its production. And biodiesel production is even more efficient.If you're going to present an essay on ethanol production, it might be wise to include real facts and studies from reputable sources rather than an Entomologist who specializes in insects.

  2. Kyle
    Kyle says:

    While some of Pimentel's numbers are in question- particularly in his assessment of biodiesel, the point he makes about using an unsustainable fuel to greenwash gas guzzling cars is important. We cannot let the auto and corn lobby determine our fuel policy just as it would be folly to let the petroleum industry determine fuel and international policy…I am a biodiesel advocate and certainly take exception with Pimentel's "research" but the concern over currently unsustainble production of ethanol (and biodiesel) is valid- its just his numbers that aren't. It appears that, at best, ethanol has an energy ratio of 1:1.2 for corn. The 1:8 number is a high estimate for sugarcane but ratios of 1:9 can be achieved with other marginal crops such as cattails.

  3. Anonymous
    Anonymous says:

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