MIT Study Shows Geothermal Could Produce 100,000 Megawatts of Energy in the US Within 50 Years

So far, Humans have harnessed the strength of the sun, water, and wind to generate clean electricity. Now, it may be time to take advantage of the earth’s capacity to provide renewable power. An interdisciplinary panel from MIT estimated that the United States could potentially produce 100,000 megawatts of geothermal energy within the next 50 years.  The report estimates that 200,000 exajoules of energy could be captured from EGS (enhanced geothermal systems) by 2050 in the US alone – that’s roughly 2,000 times the total consumption of the country in 2005.

At a time of record gas prices and climate concerns, tapping into geothermal energy contained within the earth’s crust has become an attractive alternative. While solar and wind technologies are inconsistent due to their reliance on the weather, geothermal can produce power nearly 24/7 at a rate that outperforms some coal plants.  The infrastructure requires less land than solar or wind, and it’s not as harmful to wildlife.  Most techniques rely on large amounts of water, which is heated deep underground in order to create steam that turns turbines.  Instead of sooty smokestacks, emissions consist primarily of water vapor.  In a country that boasts numerous volcanoes, geysers, and hot springs, geothermal plants could become a viable domestic option for the production of power.

Currently, the United States and Iceland have large plants in the planning stages, and demonstration structures are popping up in France and Germany.  Most of the hurdles facing the development of EGS consist of creating or retrofitting infrastructure, cost of production,  and manufacturing pumps capable of handling high volumes water.  At present, geothermal energy costs somewhere between ten cents to a dollar per kilowatt hour, depending on the terrain and operating system of where it is produced. While this is higher than the 6 cents per kilowatt hour for coal, the price gap may start to lessen if cap-and-trade policies go into effect.  Considering the impact of fossil fuels on the environment and the costs associated with health and climate change, EGS may eventually become a lot cheaper.

While large-scale EGS may be 40 years away, organizations such as Google.org, the philanthropic branch of the Internet giant, have already committed $11 million to the development of the technology.  California and Nevada appear to be the most promising sites, but there are numerous locations across the country ready to become part of the movement.

Comments

When I first heard about geothermal technology I was in my junior year Geology class in 2006, I thought it was pretty amazing what could be done, but this was before the technology became enhanced.

Since then I've learned about how its possible to power and provide energy and resources to the entire planet without money, and have decided to get my degree in geosciences to get a job with one of the top geothermal companies in the future.

I cannot wait.

Although power generation from geothermal energy is a fantastic application, it is my firm conviction that using the heat directly for industrial, agricultural, and commercial uses provides the widest range of applications with the best end use.

Also, for those interested in finding more out about geothermal technology and applications, you should check out the National Geothermal Academy for an educational overview of all geothermal subjects.

Most estimates of geothermal power assume the conversion of water into steam. That approach requires a heat source of high quality, which may not be economical in many areas.

A better alternative is the use of a Sterling heat engine. These engines can use any temperature differential to generate electricity. A working fluid can be piped into a closed system to fairly shallow depths to be warmed. The cold side of the engine can be any above ground water source. This would be much more economical and have less environmental impact because no water is pumped into or removed from underground, and the well does not need to be as deep.