- Virtually all of the assumptions underlying the Renewable Fuels Standard enacted in 2007 have changed, as the US emerges from energy scarcity into abundance.
- The linkage between the RFS and food prices is controversial, but a new quantitative model underscores concerns, especially for its impact on developing countries.
That requires a review of US fuel consumption and import trends, commodity prices, and the impact of the RFS on food prices. After summarizing the other points I want to focus on the last one, based on an interview I conducted with Dr. Yaneer Bar-Yam, an expert on complex systems who has developed a model that explains the behavior of food prices since the introduction of the first, less ambitious RFS in 2005.
In the fall of 2007, when Congress was debating the Energy Independence and Security Act that included the current, enhanced RFS, the US energy situation looked dire. For four years oil prices had been rising more or less steadily from their historical level in the low-to-mid $20s per barrel (bbl) to around $90, on their way to an all-time nominal high of $145/bbl the following summer. US crude oil production was in its 22nd consecutive year of decline, while our crude oil imports had climbed to 10 million bbl/day, twice domestic production that year.
Even more relevant to the thinking behind the RFS, US gasoline consumption stood at a record 142 billion gallons per year and had been growing at an average of 1.6% per year for the previous 10 years–another 2 billion gallons added to demand each year. In its annual long-term forecast for 2007, the Energy Information Administration (EIA) of the US Department of Energy had projected that gasoline demand would grow to 152 billion gal/yr in 2013 and 168 billion gal/yr by 2020. Meanwhile, US net imports of finished gasoline and blending components had reached a million barrels per day in 2006, equivalent to 15 billion gal/yr–equal to the corn ethanol target set by the 2007 RFS for gasoline blending in 2015. And by the way, US corn prices for the 2006-7 market year averaged $3.04 per bushel (bu). In this environment, policy makers regarded ethanol as a crucial supplement to dwindling hydrocarbon supplies, from a feedstock that was cheap and readily expandable.
Without belaboring the events of the last five years, virtually every one of those trends has reversed course. That has occurred partly as a result of the recession and the lasting changes it produced in the US economy, and partly due to an energy revolution that was largely invisible in 2007 but had already begun.
US gasoline consumption peaked in 2007 and has since declined to 133 billion gal/yr last year. The EIA forecasts it to fall to 128 billion by 2020 and 113 billion by 2030. US crude oil output is the highest in 22 years and is set to exceed imports this year, while the US has become a net exporter of gasoline and other petroleum products. Since 2007 US ethanol production has grown from 6.5 billion gal/yr to 13.3 billion gal., and it seems more than coincidental that corn prices had doubled to an average of $6.22/bu by last year.
That brings us to the controversy that has been widely referred to as “food vs. fuel”. In the last several years I’ve read numerous papers attempting to determine by correlation or other empirical methods whether and to what extent the increase in US ethanol production from corn has affected food prices. To put this in context, since 2005 the quantity of corn used for US ethanol production has grown from 1.6 billion bu/yr to 5 billion bu/yr, or from 14% to 40% of the annual US corn crop.
Some studies, such as this 2009 analysis from the non-partisan Congressional Budget Office found a significant influence on food prices. Others, including an Iowa State study recently cited in a blog post from the Renewable Fuels Association, found a negligible influence. What differentiates the work of Dr. Bar-Yam is that he and his colleagues have developed a quantitative model based on two key factors — corn consumed for ethanol and commodity speculation — that closely fits the behavior of a global price index. Their model also accounts for the “distillers dried grain” byproduct from ethanol plants, which returns about 20% of the corn used in the form of protein-upgraded animal feed.
Before speaking with Dr. Bar-Yam, I was a bit skeptical of his results. Aside from skepticism being my default mode in such situations, I had spent a lot of time looking at claims of speculator influence on crude oil prices in the 2006-8 period and was never convinced that they were more than the “foam on the beer”, rather than a basic driver of prices. However, as I was reviewing his paper prior to our call, a light went on.
The curve his model predicted, which closely matched food price behavior, looked very much like the behavior of a process control loop responding to a ramped change in the set point–forget the jargon and think about how the temperature of your home responds to a steady increase in your thermostat setting: overshooting, then undershooting, before converging. We discussed this and he confirmed that it was effectively an "under-damped oscillator", which can be characterized the same way whether you're talking about an electrical circuit or a market. In effect, the steadily increasing corn demand from the ratcheting up of the RFS started corn prices rising, and the presence of lots of speculators, including “index fund” investors, caused the price to successively overshoot and undershoot the equilibrium price track one would expect.
Dr. Bar-Yam explained that he had arrived at these two factors by eliminating factors that other groups had investigated, but that turned out to have no predictive value. These included shifting exchange rates, drought in Australia, a dietary shift in Asia from grains to meat, and linkages between oil and food prices. In his view the focus on ethanol and speculation is validated by the shift in dialog on this issue away from other, extraneous causes.
He also emphasized that his main concern is not the price of processed foods in developed countries such as the US, for which commodity grain costs are only one input, but rather the price paid for simple foods by poor people in the developing world. From that standpoint he doesn’t just want to see the RFS reformed. ”It is important not just to repeal, but to roll back the amount of ethanol used in the US.” He would prefer not 10% ethanol in gasoline, let alone 15%, but about 5%. “The narrative has to shift,” he said, “to recognize that people are going hungry.” Those are powerful words, and I’m still thinking about them.
At current production levels ethanol from corn contributes the energy equivalent of 6% of US gasoline consumption and about 2.5% of total US liquid fuel demand. That’s not trivial, and there’s a whole domestic industry of investors, employees and suppliers who made that happen at our collective request. However, If Dr. Bar-Yam has accurately captured the relationship between ethanol and global food prices, then we urgently need to reassess what we’re doing with this fuel.
We are also in a far better position now to consider scaling back our use of ethanol produced from grain than we were when the RFS was established. With increasing production of shale gas, tight oil and various renewables, the energy scarcity that has defined our policies for the last four decades is far less relevant to our policy choices going forward. I’ll tackle the practical aspects of RFS reform, in terms of the so-called “blend wall” and its impact on gasoline prices, in a future post.
A slightly different version of this posting was previously published on Energy Trends Insider.