February 5, 2015 § 1 Comment

Much reporting has been devoted to the hypothesis that Saudi Arabia held the line on not reducing production in the face of plummeting prices in order to drive US shale oil production into retreat.  If history repeats shale oil may actually become stronger, but not right away.

Hard to argue is the fact that the US has been placed in the position of becoming the swing producer.  In other words US production surges and declines will directly influence the world price of oil.  The Saudi’s used to be in that position and this was the primary basis for the OPEC cartel being the determinant of pricing.  The US added a million barrels per day (bpd) to the market each year for the last three years.  Until late last year this merely made up for declines in other parts of the world.  Then Libya added 700,000 bpd late last year and supply went into imbalance with demand.  This was particularly the case because China dropped into an unaccustomed single digit growth of their GDP, after a decade and more of double digit growth.  That drop in demand in China and elsewhere (India’s growth rate also ratcheted down) combined with US production and Saudi inaction led to a halving of oil price in the matter of a couple of months.

Most oil companies have responded with projected reductions in spending.  This will slowly have a depressing effect on production.  Shale oil has breakeven pricing between $40 and $65.  The higher cost prospects and those with restrictive financing conditions will drop out.  Also dropping out will be the so-called stripper wells, loosely defined as wells producing less than 100 bpd.  That’s right, shale oil wells produce as little as that.  In fact the vast majority are well under 700 bpd.  This compares to offshore wells producing 50 to a 100 times that.  Also, flat production in shale oil requires continuous drilling, due to high rates of decline in production in a given well.  The reported plummeting in rig count is therefore more of an indicator of future production decline than it would have been in conventional production.  All of this means that shale oil production can be expected to start declining in a matter of months.  This will put upward pressure on the price of oil.  A new normal may well settle in around $60 by the end of the year.

But the purpose of this essay is not to predict the future on oil pricing.  I am suggesting that a sustained low price of oil is likely to stimulate innovation.  In the decade comprising about 1985 to 1995, the price of oil had sunk and rig counts went from 2400 in 1985 to a flat 700 or so in the early nineties.  Forced to profit in a low oil price market (oil companies affected) and low rig count market (service companies impacted), industry, and the service companies in particular, responded with a basket of technologies that forced down the cost to produce.  For interest, the technologies were 3D subsurface imaging brought to the desk top, horizontal drilling and key enablers known respectively as steerable systems and measurement while drilling (MWD).  I was directly involved in the development and launch of the last mentioned, so know the period well.  The figure below shows the change in cost to produce over that period (undiscounted).  Service company profits were high because value pricing was available for that sort of gain.  The company in which I worked had revenue increases in the period 1987 to 1994 of about 7 times, and EBITDA increases with an even higher multiplier.

Production cost drop

Will history repeat?  The reason to respond in the affirmative is in part that the industry has been living on borrowed time in this sector.  In some ways the industry has been fortunate to profit while employing essentially brute force techniques. Many in the public believe that shale oil and gas spawned horizontal wells and hydraulic fracturing.  Not so.  Horizontal wells hit the ground running in the period mentioned above and fracturing had been going on for decades prior to that.  In point of fact the technologies are being deployed in a very inefficient manner except for significant efficiency gains in the drilling process through pad drilling (closely spaced wells on a small footprint with rigs moving quickly on rails).  In particular, the reservoir is not being well managed.  Up to 50% of fracturing zones can be non-productive.  Only about 5% of the oil in place is currently being recovered.  New wells decline in production up to 70% in the first year.  All of these can be attacked with a high likelihood of success.  Again, the most likely players in this are the service companies in part because the vast majority of shale oil and gas is being produced by small players with little or no research capability.  This is my first mention of gas.  Shale gas will also profit directly from technology gains in the areas mentioned.

If history does repeat we could expect the breakeven price for shale oil to drop to $30 and below.  If that comes to pass, and industry responds predictably, and the reserves are in fact there, the world will be awash in oil again.  Market forces of supply and demand will control and OPEC will cease to be important.

Vikram Rao


December 1, 2014 § 1 Comment

The November 24, 2014 issue of the Wall Street Journal has a point counterpoint piece on this issue.  Tyson Slocum of Public Citizen speaks against the notion of lifting the oil export ban and Jason Bordhoff of Columbia University is in support.  They both discuss the popular issues: effect on gasoline price to the consumer, national energy security and the environmental threat of continued shale oil production.


                                     Source: Energy Information Administration

The Domestic Oil Glut: Good for Us?

Slocum raises an issue that is new to me, that the glut is beneficial.  He recognizes that keeping the export ban and thereby keeping US oil out of the world marketplace is a factor in West Texas Intermediate (WTI) oil price running below Brent, the benchmark for the rest of the world.  The differential has been as much as $20 per barrel.  It was not always so.  Looking back the last five years, the split is coincident with the run up in production in Eagle Ford in 2011 and then later the Bakken.  One could comfortably conclude that the differential was caused by US shale oil production and the inability to put it out on the world market.  Of further interest is the fact that Bakken crude fetched a price lower than WTI for much the same period (late 2010 until the present).  This was occasioned by the fact that the shale oil has a light sweet (sulfur less than 0.4 %) character.  While seemingly a reason to rejoice for refiners, this presents a vexatious problem for them.  They spent enormous capital on equipment to process heavy and mostly sour crude from Canada, Venezuela and Mexico.  They also can buy this crude at a significant discount to WTI because of the relatively high proportion of carbon that cannot be converted to a useful fuel or chemical.  Now they were being asked to substitute this discounted imported crude utilizing their expensive capital with domestic crude at WTI price that would idle said equipment.  They responded by offering a lower price than WTI.  This sort of market based pricing is normal.  However, in this instance the market is being manipulated by the export restriction.  US producers are not in a position to spurn the US refineries and sell for higher prices elsewhere.

Slocum argues that this is good for the country.  He maintains that the resulting glut in US supplies “helps insulate the American economy from the uncertainty caused by oil supply disruptions abroad. Opening exports would remove that protection, which would be disastrous.”  In other words he thinks maintenance of a supply glut in perpetuity through a policy action is a good remedy for the occasional burps in world supply.  The national Strategic Petroleum Reserve (SPR) was created for just this scenario and no further policy action is needed in support.  30 million barrels of the reserve was released in 2011 in response to the Arab Spring related disruption.  I have also opined elsewhere that the SPR could be drawn down quite a bit in recognition of the fact that shale oil can be brought on stream very rapidly.  Proof for this assertion is that US shale oil production has increased by 1 million barrels per day (bpd) over each of the last two calendar years.

Effect upon Gasoline Pricing.

Both Slocum and Bordoff address this issue.  The public in general appears to be in Slocum’s court in believing that exports would cause the gasoline price at the pumps to go up.  Bordoff argues, in my opinion correctly, that gasoline is a world commodity and that prices are generally set by Brent pricing.  He ascribes this to a finding by the US Energy Information Administration (EIA).  I also agree with his view that allowing US crude on the world market is likely to have some downward pressure on Brent pricing, and hence gasoline.  Of note, though, is that US crude would add light oil to the market increasingly dominated by heavier crude.  So the main destinations would be “simple” refineries not the complex ones such as those that spurned it in the US.  So a factor would be the number and locations of these.  It is known that several such refineries have been mothballed in Europe.  Incidentally, at least two small simple refineries previously shut down have now been reopened in Texas.  One new one has been permitted in the Bakken, the first new refinery permit in decades.

Curiously, neither of the two authors speaks to the effect of the policy to allow export of refined products, including gasoline.  These account for 3.5 million bpd.  In my view, the fact that gasoline can, and is, exported, is a factor in gasoline prices remaining high simply by supply and demand arguments.  In theory, however, a simple refinery located close to oil production could produce gasoline relatively cheaply and pass on the savings to the consumer locally.  But this is not likely to be a large effect.  Each of these refineries is less than 20,000 bpd, compared to world scale ones up to and over a million bpd.  So their cumulative impact is relatively small.  But if the trend takes a hold, and in my view it ought to, much of our oil could be processed in these highly distributed small refineries.  Pipelines would be minimized, with a positive environmental footprint as a result.  Today the Bakken is moving a million bpd crude oil in largely unregulated trains already shown to be prone to derailment and attendant damage.  Local refining would be a welcome alternative.

Vikram Rao


October 8, 2014 § 7 Comments

There is that movie soundtrack by Paul McCartney which goes “Live and let die”. If the current drop in oil prices (see figure below) is sustained for any significant length of time, the effect on countries will be highly variable.  A sustained Brent oil price below $90 per barrel will do potentially grievous harm to the Russian economy with or without the financial burden of aggression in the Ukraine.  The latest Russian budget was premised upon oil at $100, and given that over 40% of treasury coffers are filled with oil and gas revenue, a sustained price below $90 would be very difficult to swallow. Some reports have it that every $1 drop in Brent results in a $2.1 billion annual drop in revenue.  In fact in an earlier blog I had mused on the option of release of the Strategic Petroleum Reserve (no longer needed in the US due to burgeoning domestic oil production), to drive down prices, or the mere threat to do so, to influence Russian aggression.

Oil price trend 2014

The US on the other hand will broadly be unaffected. A steady Brent price between $80 and $90 (if there is such a thing as steady oil pricing) could dampen some of the shale oil ardor.  Shale oil prospects are highly variable with respect to breakeven price, but the vast majority of them make good returns at $80 per barrel pricing.  Particularly if oil export were to be permitted, the net effect would be minimal.  This is because US shale oil currently sells at a discount to Brent of well over $10, and export would afford it full Brent pricing.  Allowing exports would markedly improve the resiliency of US shale oil production relative to softness in world oil pricing.

Many oil producing countries could be placed in an untenable situation were the Brent prices to stay below $90 for extended periods of time. The Gulf monarchies have spent lavishly on their populations especially following the Arab Spring.  Good numbers are hard to come by, but Saudi Arabia is believed to need a $90 price as a minimum to sustain the social benefits.  That number is higher in some of the other OPEC members such as Venezuela and Algeria, as also in Iran.

The drops in oil price do not appear to be any country’s doing. As we previously reported, world oil production dropped by 2 MM bpd over the last two years and was entirely made up by new US production from shale deposits.  But more recently supply has also picked up elsewhere, especially Libya.  Demand on the other hand has reduced, especially in the US.  The trend towards demand reduction will continue at least in the US, where methane and ethane will displace oil in transportation and as the feedstock for chemicals such as olefins.  Although unintended, a sustained drop in oil prices will serve the political interests of US and its allies vis a vis containing Russian aggression in the Ukraine.  A sustained loss of oil and gas export related revenue, in conjunction with economic sanctions, would make military expenditures in the Ukraine affair essentially infeasible.  The most related aspect of the sanctions is that with loss of revenue the Russian oil firms would need to borrow and foreign capital would simply not be available.

This is somewhat ironic because Russia has threatened to use curtailment of gas supplies to Europe as an imposition of political will. I have maintained in these pages that energy is a much more powerful weapon than armies for exacting pain for behavior seen as detrimental to the interests of a producing country, in this case Russia.  In other words they would be living by the sword of energy.  It seems now that there is a risk of dying (thrown into a deep recession) by that very sword, even if it was wielded unintentionally and by no one in particular.

Vikram Rao


September 27, 2014 § 1 Comment

The White House Science advisor John Holdren is credited with suggesting that responding to the threat of climate change ought to be some mix of mitigation, adaptation and suffering, and all that remained to be determined was the mix. This statement implies the inevitability of climate change and that preparing for it must be a part of the response.  I suspect this cheered the climate hawks more than the doves.  The suffering part is right out of the playbook of economists, the dismal science folks.  Bleak though it may be, it is recognition of a stark reality.  The entire statement is an acknowledgement that doing nothing is in fact a choice for suffering.  Accordingly, climate hawks must not take too much comfort in the statement.

Even those who consider that climate change is a reality do not necessarily agree that climate science is “settled”, a characterization that is common. Nobody doubts that adding carbon dioxide to the atmosphere has adverse consequences to global warming.  But influential scientists such as Steve Koonin dispute the ability of our models to predict the balance between human and natural influences. Consequently, adaptation has to be an important part of the debate on response.

Hurricane Hugo Slams Into Puerto Rico

In discussing the Holdren utterance, David Roberts recently had some interesting takes.  He suggests that the effect of mitigation is global while that of adaptation is local. He goes on to conclude that mitigation is altruistic and adaptation is “the opposite”, serving only a self-interest.  We will now examine this very interesting point of view.

Mitigation is that great big grab bag comprising all the measures to reduce greenhouse gases. These range from carbon capture and storage to curbing fugitive methane to energy efficiency and conservation.  Many of these have positive outcomes to society beyond the carbon mitigation objective including economic value created. Mitigation certainly has global impact.  In fact the common complaint is that India and China are not doing their part and consequently exacerbating the problem.  So in that sense a mitigation action is altruistic because it benefits distant faceless people unknown to us.  But it is not that clear and simple.  Mitigation measures include many that are technologies which can be sold to other parts of the world for a profit, neatly removing them from the altruism bucket.  An example is small modular nuclear reactors which are well suited to the over a billion people with no access to power grids. This serves the purpose of mitigation through not using fossil fuel (in the case of villages it is usually subsidized diesel).  But it is also adaptive because distributed power is inherently more resilient due to absence of grid infrastructure. It is easier to implement distributed power when there is no grid at all.  Consequently this is a technology from the first world that is uniquely appropriate for the third world.  Transferability could apply to a host of energy efficiency technologies.  The execution of these measures in the west could well be viewed as altruistic but not the transfer to other parts of the world.

Roberts also contends that carbon mitigation is innately altruistic because the benefit accrues to people in the future. This would have a ring of authenticity were it not to be for the popular refrain that climate action makes the world better for “our grandchildren”.  There goes altruism.  Incidentally, there is a school of thought that privation well into the future ought to be discounted with a social discount rate (similar to a financial discount rate) of as much as 3%.  But this is not the forum for that discourse.

Adaptation is even more opaque. Roberts suggests that adaptation is solely local and “benefits only those proximate to the spender”.  While this is true of the measures taken to account for sea level rise (in fact he uses the example of sea walls), many other measures have immense transferability even without redistribution of wealth.  An important example is sustainable food production in the face of climate change.  Here we define climate change to be “alterations in climatic and weather conditions characterized by shifts in average conditions and in the frequency and severity of extreme conditions” as discussed in a 2012 report on adaptive food production methods. These approaches are in large measure transferable to the second and third worlds and in some cases explicitly so.

Some of us here at RTI have been mulling over the extent to which distributed production of fuels and chemicals may be seen as an adaptive defense against climate change. Distributed production is a relatively new concept of producing chemical plants fifty to a hundred times smaller than conventional and located closer to either the raw material source or the market.  For purposes of this argument we will assume cost neutrality with respect to the alternative conventional large plants.  Certainly this action would result in shortening of supply lines of raw material, finished goods, or both.  Supply lines are notoriously disrupted in extreme weather.  Fewer long distance pipelines would also result in a smaller environmental footprint.  This issue merits study in part because to date the entire push for distributed production has been premised upon economics only and not the societal benefit.

Vikram Rao


September 18, 2014 § 2 Comments

The oil export ban is an anachronism and needs to be lifted. The original energy security beliefs no longer hold water.  We are fast approaching the point at which domestic production augmented with that of the near neighbors Canada and Mexico will serve the bulk of our oil needs.  Combine this with the fact that an overabundance of natural gas will inexorably displace oil in many sectors, beginning with key chemicals such as ethylene and derivatives.

The most compelling argument until recently was the nature of the oil that we produce. It is light (API gravity greater than 40) and sweet (less than 0.4% sulfur), making it highly desirable to all but the US refineries.  This anomalous situation comes about from the fact that most US refineries are outfitted with expensive process equipment to handle heavy crude (API gravity less than 20) often with high sulfur and heavy metals.  Heavy crude sells for a discount of 15 – 30% to the benchmark West Texas Intermediate (WTI).  So they are loath to pay full WTI price for crude that does not effectively utilize their expensive equipment.  The result is that oil from the Bakken has sold in 2014 for a discount to WTI ranging from $5 to $15 per barrel.  WTI in turn is selling at a discount to the North Sea benchmark Brent price.  In 2014 that spread was between $5 and $12.  US refiners love this spread because their raw material is cheaper.  They also love the shale oil to sell at a discount to WTI.  They are the principal opponents to lifting the crude export ban.

A segment of the public believes that oil exports will lead to higher gasoline prices. Since oil is fungible, with a world price, this argument is not viable.  However, one could argue that export ban mediated lower cost oil would allow US refiners to produce gasoline for less and pass on that reduction to the consumer.  The fly in that particular ointment is that gasoline exports are permitted by law.  So refiners will necessarily sell to the highest bidder.  In fact, export of US diesel to Europe is believed to be in part responsible for the shutdown of refineries there.

This last point brings us to the second reason to consider lifting the ban: possible oil diplomacy. Europe currently imports over 3 million barrels per day (bpd) from Russia, in addition to 14.7 billion cubic feet per day (bcfd).  Retaliation for sanctions is likely to come in the form of energy supply tightening.  US oil exports to Europe will have two positive outcomes.  One is just the gesture of coming to their aid and the corollary benefit that this quality oil is well suited to “simple” refineries, especially in Eastern Europe. The other benefit is to the US GDP.  This oil will sell for Brent price, which as we noted before is $10 to $27 over what Bakken oil sells for today.  Even at just a million bpd, that results in additional revenue to US producers of up to $10 billion per year.  Keep in mind also that US shale oil production has been seeing annual increases of a million bpd for the last two years.  The figure reproduced below from Platts is striking.



Over the period February 2012 to May 2014 US production increase has single handedly made up for a net drop of 2 million bpd from the rest of the world. While this US production rate is expected to slow in 2014 to closer to 0.75 million bpd, the contribution will continue to be large, and the bulk of this is not suited to US refineries.  So the domestic glut of light sweet crude is likely to continue.  Exporting oil is good for the economy and a potentially important political gesture at a time when European allies are needed to combat the latest threat in the Middle East.

Vikram Rao


August 31, 2014 § 2 Comments

A recent story in Forbes tells the tale of the rise, fall and rise of LyondellBasell, a Houston based chemical manufacturer.  At first blush the story is a gripping tale of savvy investing, risk taking and two opposite bets by equally shrewd investors.  But the true message is really none of that.  It is entirely the plus side of the Ethane Dilemma that I discussed in my shale gas book two years ago.  It is also a lesson in the possibility that behind every problem lurks an opportunity.

The tale unfolded in 2007 when Basell, a European chemical company bought struggling Lyondell Chemicals.  By 2009, in part beset by the recession, the newly named LyondellBasell sought Chapter 11 bankruptcy.  Apollo Global Management saw an opportunity and essentially purchased the company for about $2 billion.  Meanwhile, billionaire Len Blavatnik, one of the principals in Basell also bought into positions in the restructured company after himself having lost serious money on the bankruptcy.  The company took off and Apollo cashed in about $12 billion in 2013. Not a bad profit in five years. Blavatnik, with a similar proportional profit in hand, instead of cashing out, continued to buy and is reported to be sitting on $ 8 billion in largely unrealized profits.  The Forbes story focuses on how savvy billionaire investors took different paths at this point.

Ethane Price as Compared to WTI

Ethane prices versus WTI

Figure courtesy of Dow Chemical Company

The Forbes story credits the shale gas revolution with the performance.  In a sense that is true but the explanation is more nuanced than that. First is the fact that the bulk of LyondellBasell profits come from ethylene and derivatives.  Second is that ethane prices started to drop relative to oil in 2009.  By mid-2010 ethane was nearly half the price of oil on the basis of energy content (see figure above). Ethylene is conventionally produced from the oil derivative naphtha. Ethylene from $4 per MM BTU ethane is about $ 600 cheaper to make per tonne, and a tonne of ethylene sells from $1000 to $1500 (the price in 2014) depending on market conditions.  This was the primary reason for LyondellBasell profitability coming strongly out of bankruptcy. In the Forbes story there is a quote: “Billionaire hedge fund manager Dan Loeb used more than half of his first-quarter letter to his investors wondering why Dow Chemical Co.–where returns have trailed LyondellBasell significantly over the last three years–wasn’t more like its rival”.  In my shale gas book I mention that 33 of 36 US crackers are on the Gulf Coast, with just two in the mid-west and one small one in Kentucky. Those two just happen to belong to LyondellBasell and are very close to ethane supply. In recognition of this, the company quickly added capacity to these two. Result: enormous profits capitalizing on the low raw material prices and LyondellBasell was uniquely positioned with respect to competitors such as Dow. Besides, Dow, while a major ethylene producer, has a much broader portfolio than LyondellBasell.

In 2013, when Apollo cashed out and Blavatnik increased his stake, ethane pricing simply dropped through the floor (see figure above). In fact the spot price of ethane in the mid-west is even less than that shown in the figure. This explains why the company profits continued to climb and the stock stands at 50% over the figure when Blavatnik last purchased stock from Apollo. In the Forbes interview Blavatnik attributes the success of his strategy to luck and hopes the luck will continue. More likely is the possibility that he saw the trend, which started in 2012.  The fundamentals underlying the trend, low natural gas price and high prices for propane and butane, will continue to cause wet gas to be produced preferentially.  Half of that is ethane, with no value unless converted to a chemical. Consequently, ethane will continue to be a glut until crackers show up. But unlike expansions of LyondellBasell crackers, new ones take many more years, significant financing, and ethane pricing crystal balls extending twenty years. In late 2013 Shell postponed indefinitely a cracker destined for Pennsylvania. Small, distributed, crackers as suggested in previous posts could be a factor in this game.  Cheap stranded ethane represents a business opportunity.  LyondellBasell merely happened to be in the right place at the right time.

Vikram Rao



June 26, 2014 § 1 Comment

Fly ash has been in the news since the Dan River, NC contamination incident earlier this year. Much of the attention has been on remedying the current situation: ash in unlined pits, especially proximal to surface water. This is appropriate because future contamination events from existing disposal sites need to be prevented. Current proposals place the timing of resolution out in the fifteen year timeframe.

So, what happens to all the fly ash produced in the interim? It could go to lined pits. In this regard there is similarity with the measures for temporary storage of liquid drilling wastes. Neither has been classified as a hazardous waste by the EPA. But in current draft NC legislation, liquid drilling wastes will be required to be stored in double lined pits with sensors between the layers. The same could do the trick for fly ash in solid or liquid form. The former is vastly preferable. This is because fly ash is light and fluffy and comprises spherical particles. This material will stay suspended and not easily settle to the bottom as sludge for removal. Bottom ash, the other type of ash in a coal combustion unit, is more amenable for pond settling.

Beneficial Use of Ash:

All coal deposits contain a certain proportion of minerals associated with the coal. These are oxides of elements such as Silicon, Potassium, Iron and Calcium. Many of these are in the clay family. When the coal is combusted these oxides remain inert. They end up in the bottom of the retort (bottom ash) or fly out of the top (fly ash). Fly ash constituents have a unique character: they comprise small spheres. As a result the material is light and fluffy. Transportation could result in dusting.

Fly ash falls into two classifications: Class F and Class C.   Both classes have oxides of the same elements noted above, but Type C will have substantially more lime (CaO). When blended with water the mixture of oxides will form a substance not unlike cement. To get the same cementing consistency with Type F one needs to add lime when completely replacing portland cement. But in either case the material can very usefully replace cement in part or whole in the preparation of concrete. Concrete is essentially sand and/or gravel bound together with cement. Displacing cement is good for the environment because the manufacture of cement is a major producer of carbon dioxide.

Concrete prepared with fly ash based cement is believed to have improved properties over the conventional material. In particular the cement flows better than portland cement in part because of the spherical character of the particles. Improved performance is also claimed for bricks made with fly ash, lime and gypsum.  Over 10% of fly ash in India (20 million tons per year) is converted to this product with the strong backing of the World Bank.

fly ash  Class F fly ash 2000x magnification

Hurdles to Use

Why, then, does not all fly ash get used in this fashion as opposed to being placed in landfills or ponds? One reason is that the producer may not be located close to the potential user and the cost of transport of this low density material could be high. There is also the risk of dusting. Fly ash can have trace amounts of Arsenic, Vanadium and other heavy metals. The original coal is the source. While representing possible hazards in transport, in the use in concrete they are benign. These elements, more than likely in the form of oxides, can be expected to be trapped in the concrete. They will not be subject to leaching because they are in the concrete body. But even when the concrete is converted to rubble at the end of life, they ought to remain in a form not subject to leaching in large measure because they will not be water soluble.

The second, and more important, reason for limited use of fly ash is the carbon content in some ashes. When the EPA introduced laws to reduce oxides of nitrogen (NOx) in the flue gases, the result was more unburnt carbon in the fly ash. When this material exceeds about 6%, it is not acceptable as a cement substitute. Two distinct types of technologies exist to overcome this problem. One is to physically separate the unburnt carbon using for example froth floatation or electrostatic methods. In most such cases the carbon is recycled for use in the combustion process. The other is to perform a controlled burn of the carbon usually utilizing the heat in some way. One elegant technique is to use microwaves. The energy is absorbed only be the carbon and not the ash constituents. This is similar to the fact that in a microwave oven the food absorbs the energy (gets heated) while the ceramic container stays substantially cool. In fact the industrial process can use the same frequency as household ovens, thus making it inexpensive because those components are mass produced.

What North Carolina Ought to Do

According to published reports very little if any of the fly ash produced in North Carolina is being used in concrete manufacture. One manufacturer testified in a state senate hearing that he was importing fly ash from other states for his use. A cursory examination of the fly ash from Duke Energy plants indicates that the majority is Class F. It will need the addition of lime (unless blended with regular cement), but concrete manufacturers actually prefer Class F because Class C ash can harden up spontaneously when wet, whereas Class F can be controlled. The carbon removal will require expense and the resulting sale of the fly ash may not always prove profitable. Of note is that Wisconsin recycles on average 85% of the ash and the national average is over 40%. So the economics are likely not prohibitive in all instances. Policy support from Raleigh could help. Any fly ash not going to land fill is a good thing.

Vikram Rao


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