Biochar is still mostly a research and cottage industry, yet it has the
potential to impact returns for a broad range of investors.
Tom Konrad, Ph.D., CFA
Biochar, or amending soil with biomass-derived carbon, shows great potential
to improve the productivity of soils, as well as to increase the utilization
of fertilizers by plants, while sequestering carbon to reduce the drivers of
climate change. On August 10, I went to the 2009 North American Biochar
Conference to look at the potential for investors.
Before I went, I took a look at the publicly traded companies involved in
biochar. I did not learn of any new public companies at the
conference, but I have nevertheless become increasingly convinced that biochar
has a large role to play in moving to a sustainable economy, not just for
energy, but for agriculture.
While the biochar industry is still too early stage for most stock market
investors, understanding the economics of biochar will give investors insight
into the effects the broad use of biochar will have on the overall economy, and
their other investments. Many types of public companies are likely to be
impacted. Some industries likely to be affected are
- Agricultural and forestry companies, which may benefit from increased yields
and an additional market for their products,
- Advanced biofuel companies which may have to compete with biochar companies for feedstock, as well as
for a place in low carbon fuel standards with a biofuel with a much lower carbon
footprint,
- Any participants in environmental markets for carbon offsets,
since biochar is likely to be a source of carbon credits.
Carbon Sequestration
Long-term carbon sequestration in the soil is the headline benefit of
biochar. Depending on how the biochar is made, it may stay in the
soil for thousands of years. Biochar has both volatile and fixed or
"recalcitrant" carbon fractions. The volatile fraction decays relatively
rapidly, over a few years or decades, while the recalcitrant fraction stays in
the soil for centuries or millennia. The relative fractions depend on the feedstock and how the char is
made, but debate continues about the best conditions and feedstocks for a high recalcitrant
fraction, which can be the vast majority of the char.
As a potentially vast source of carbon offsets, biochar has the potential to
reshape offset markets for carbon dioxide. Although biochar is not
currently accepted as an offset in any climate trading regime, many expect that
it will soon qualify. Peter
Weisberg, an Offset Project Analyst at The Climate Trust not only expects
that biochar will qualify as carbon sequestration, but says that The
Climate Trust is interested in purchasing offsets from biochar projects.
If biochar does qualify for carbon finance, it will place downward pressure
on the price of carbon offsets... to a point. As anyone who has grilled a
hamburger knows, char can also be burned to produce useful heat. Anyone
who buries char gives up the use of that energy. I asked a couple
experts what they thought might be the value of the forgone energy. David Laird, a Research Soil Scientist at the US
Department of Agriculture thinks the break even point would be about $10/ton of CO2, or
about $30-$40/ton of carbon. Dr. Joel Swisher, Chief
Technology Officer at carbon-offset provider Camco
International, thinks the number is somewhere between $10 and $20 per ton of CO2, or about $50/ton
carbon.
While
these prices are higher than offsets currently trade on most exchanges, they
also assume that the only benefit of incorporating biochar into the soil is the
carbon sequestration aspect. That is not the case.
Improved
Soil
In
all but the most optimal growing conditions, biochar increases plant
productivity. Although the mechanisms are not completely understood,
most studies show that biochar allows plants to more effectively use Nitrogen
and Phosphorus, as well as other nutrients that either occur naturally in the
soil, or are added with either organic or inorganic fertilizers. It also
aids water retention.
The
effects of this are significant increases in plant growth, especially in poorer
soils or with limited fertilizer or water; heavily fertilized and higher quality
soils show lesser effects. In poor conditions, some studies have seen
boosts to plant productivity by as much as 40%, although 15-25% is a more normal
range, to judge by the studies presented at the conference.
This
improved soil fertility has several benefits, each of which could serve as an
added enticement for farmers to use char. Because plants can use the
available nutrients more effectively, a farmer should be able to use less
fertilizer and still achieve a high rate of growth from his plants. Not
only does this save the farmer money, but because less fertilizer is used, and a
greater fraction of it is taken up by plants, there is less resulting pollution
in the form of fertilizer
runoff and nitrous
oxide formation. Nitrous oxide is a potent greenhouse gas and also depletes
the ozone layer.
The
cost savings from reduced fertilizer use, lowered irrigation costs from improved
water retention, as well as any reduced costs of
meeting environmental regulations may all have value to farmers which might
induce them to sell biochar based offsets at prices below that dictated purely
by the cost of the energy forgone.
These
reduced costs for farmers, as well as the potential new revenue streams from
offsets and increased crop productivity add weight to my previous conclusion
that investing in farms and other sources of biomass feedstocks is one of the best
ways to benefit from bio-energy (biofuels,
as well as biomass
based electricity and biomass
cofiring.)
Other
Commodities
Increased
plant productivity with bichar may eventually increase the supply of available
biomass for bio-energy applications and food. This may benefit the
economics of any biofuel technology, but I expect the gains to only be marginal,
since most biofuels are commodity
businesses, and an increase in feedstock supply may increase volume, but is
unlikely to improve long term margins.
Reduced
fertilizer use might also be expected to reduce prices in fertilizer markets,
but to the extent that fertilizer is made from commodities such as natural gas
(which have a wide variety of other uses,) the effect on fertilizer prices can
also be expected to be marginal.
Renewable
Energy
The
whole story, however, is not just the char. During pyrolysis, a whole
range of volatile organic compounds are emitted from the biomass feedstock, and
these can be used to
- Produce
bio-oil, which can be upgraded into liquid fuel. The company Dynamotive
(DYMTF.OB) is working to commercialize this process, as I discussed in
my investing
in biochar article.
- Fuel a generator to produce electricity.
- Produce heat for some other process.
The choice between these options depends on a range of factors, most
importantly scale and if there is a local need for heat.
Some biomass feedstocks, such as poultry litter are available in massive
quantities in a single location. This allows the use of a larger scale
plant, and hence will most likely lend itself to the production of higher value
energy which requires more processing, such as bio-oil based liquid fuel.
Hence, if a liquid fuel production process is widely adopted, it may not only
help the company which commercializes it, but it may also produce significant
added value and clean up a pollution problem for producers of concentrated
biowaste, such as poultry producer Tyson
Foods (TSN).
The specific type of biomass also affects the use of the volatile
organics. Some sorts of biomass, such as corn stover, contain large
amounts of silica or other impurities which can cause buildup in electric
generators and add to maintenance costs. In such cases it may make more
sense to produce bio-oil or heat, rather than electricity.
Heat can be produced by directly burning the volatile organics, or recovered
in a combined heat and power operation when generating electricity. Generating
heat is the simplest process, and hence will lend itself most readily to
distributed biochar facilities. The catch is that, in order to capture the
economic value, there has to be a local use for the heat.
One practical variation is the use of specially designed efficient cookstoves in the third world. These are
optimized to both improve cooking efficiency, indoor air quality, and biochar
production. Biochar advocates hope this approach could impact developing
nations in a number of significant ways including improved health of woman and
children, improved nutrition from the garden amendment, and decrease the need
for biomass in cooking due to improved cook stove efficiency.
Even if the heat is not used, however, it is important to flare the gasses released
when creating biochar, since volatile organics are pollutants in their own
right.
Conclusion
Biochar, although a simple technology, is still at a very early stage of
commercial development. Nevertheless, stock market investors would be wise
to be aware of the broad ranging effects the industry might have on carbon
trading, biofuel, fertilizer, and agricultural markets. Even these
industries may not be a complete list: There is ongoing research into using
biochar for remediation of mine tailings. Backyard gardeners may also be able to improve their productivity and
reduce fertilizer use by incorporating biochar into their soil.
It is important to note that not all biochars are created equal. Most
biochars are slightly basic, and will produce greater benefits in acidic
soils. It's worth knowing the properties of what you plan to be putting in
your soil before you incorporate it. It's also worth noting that biochar
has its greatest effects when combined with small to moderate amounts of
conventional or organic fertilizers, since biochar is not a fertilizer in
and of itself, but rather helps plants make better use of the nutrients in
fertilizer.
Mantria sells a commercial biochar called EternaGreen
from a biochar
plant in Tennessee, with a distribution center in Georgia. I hope this is
just the first of many, so most of us will be able to use biochar without having
to worry about the carbon footprint of shipping. Or, rather than waiting,
we can make
(probably lower quality/less recalcitrant) biochar ourselves.
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