Tag Archives: fracking

The Evolution of Geothermal

You can only operate a geothermal power plant in the presence of abundant geothermal energy, right? Wrong! Well, sort of.

Source: Personal Collection

Geysir, Iceland
Source: Personal Collection

Historically, the building and operation of geothermal power plants has been tightly restricted to geothermally active areas. Think places like New Zealand, Iceland and the Philippines, where energy literally comes bubbling out of the ground in the form of hot springs, geysers and steam. These areas are usually found on the boundaries of the huge tectonic plates that make up the earth’s lithosphere. Along the borders of these plates, geothermally heated aquifers often flow relatively close to the surface, and these sources of energy are simply begging to be harnessed. The problem is, however, that the areas where these conditions exist make up less than 10 percent of Earth’s dry land.

What About the Cool 90 Percent?

Here is the good news. Geothermal energy originates below the earth’s crust, where the steady decay of naturally radioactive materials produces heat continually. Theoretically, this source of energy is available virtually everywhere, albeit at a greater depth than in the previously mentioned, geothermal areas. The total amount of thermal energy within a depth of 10 km from the earth’s surface is estimated to be 50,000 times greater than all the natural gas and oil resources in the world.

Efforts to harness this hidden energy are already being made in various places across the globe, using a new technology called Enhanced Geothermal Systems (EGS). The method essentially expands traditional geothermal energy production through the use of hydraulic fracturing. It consists of drilling a well to a depth of about 3 to 10 km, where temperature levels are usually between 70 and 315°C. In contrast to EGS, traditional geothermal power plants usually only require wells that are 2 to 3 km deep, in order to reach the same temperature levels. Upon reaching this depth, water is pumped into the dry layers of hot rock at high pressure, which causes the rocks to break and thus increases their permeability. Cold water is then pumped down through an injection well, where it flows through the hot rocks before returning back to the surface as steam, through a separate well. The steam is then run through a turbine where it produces electricity, before it is cooled and condensed, and pumped back into the ground.

Source: EERE

The EGS Process
Source: EERE

An Earth-Shaking Prospect

This technology offers a number of different benefits. First of all, it introduces a vast supply of geothermal energy potential to areas that have hitherto been considered too cold for such ventures. The EGS technology also enjoys many of the same benefits associated with traditional geothermal energy production. It is a steady, renewable source of energy and geothermal plants require very little land space per MW produced, in comparison to other types of power plants. However, drilling in itself is a messy and expensive business, and as the technology is still in its infancy, the upfront cost of an EGS project remains very high.

The technology also has to deal with the issue of induced seismicity, as the injected water can act as lubricant on highly stressed layers of rock near geological fault lines. In 2009, a $60 million EGS venture was cancelled in Basel, Switzerland, due to a flurry of earthquakes that were generated as a result of the project. While the momentum of EGS has been lessened by setbacks such as the Basel shutdown, as well as the under-delivery of other ongoing projects, the potential benefits that the technology promises are hard to negate. Proponents of EGS are still willing to brace the significant learning curve that lies ahead, before the technique becomes both technologically refined and cost competitive, and geothermal becomes a global source of renewable energy.



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Fracking the Russians

Generally when we talk about energy policy we mean decisions regarding industry regulations, subsidies, and reserves. Occasionally though new technologies in the energy sector can have far reaching consequences throughout the political world. An example is the seismic shift in Russian diplomatic strategy and options in just the past 2 years.

As has been mentioned in previous posts, advances in natural gas extraction, particularly horizontal drilling and hydraulic fracturing or “fracking” have vastly expanded the US’s established natural gas reserves:

“Proven U.S. reserves have risen to 245 trillion cubic feet in 2008 from 177 tcf in 2000, despite having produced nearly 165 tcf during those years,” says Daniel Yergin of Cambridge Energy Research Associates. “With more drilling experience, U.S. estimates are likely to rise dramatically in the next few years. At current levels of demand, the U.S. has about 90 years of proven and potential supply — a number that is bound to go up as more and more shale gas is found.”

At the same time, these massive gains have had a very different impact on the other side of the world. As recently as 2008 Russia’s long term international strategies assumed their position as an energy supplier, primarily due to their natural gas reserves. In fact, in 2005, during a dispute with the Ukraine over gas pricing, Russia flexed its political muscle by cutting off gas supplies to Western Europe. Additionally, in what many industry observers considered a first step towards an OPEC-like cartel, Russia joined with fellow gas exporters Algeria and Iran to open an international natural gas office. Exploration of the massive Shtockmann field under the Arctic ocean was predicated on a world market desperate for Russian national gas, especially in Western Europe and the US.

That has all changed now. The Shtockmann fields have been mothballed, partially due to the global economic downturn, but also due to the drying up of demand for Russian gas. The US, who in 2003 was hearing warnings of domestic natural gas running out, is now poised to become self-sufficient on natural gas, and potentially start exporting. With the glut of natural gas on the global market today, Russia’s clout in the energy sector has waned, along with the political power that came with it.

At this point it’s unclear what the eventual political fallout of Russia’s diminished influence will be. However, there could be a silver lining, as the Russian economy may be forced to diversify away from the energy sector, resulting in a more stable and modern economic base. Which, in the long term, may be far more beneficial than the dominance of a being a major natural gas supplier.

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