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Geothermal Industry Grows, With Help From Oil and Gas Drilling

25/07/2014 by


Geothermal energy — tapping into heat deep underground and using it to produce power — is sometimes described as a forgotten renewable. It languishes in the shadows of better-known sources like wind and the sun, and in 2011 it accounted for less than 1 percent of electric power worldwide, according to last year’s World Energy Outlook.

Yet the geothermal industry is growing, if slowly, and proponents hope that new technologies — including tie-ins with drilling for oil and natural gas — will bring further gains. Last year, the amount of electric power capacity available from geothermal resources grew about 4 percent to 5 percent globally, according to a report released in April by the Geothermal Energy Association, which is based in Washington. The United States remains the world’s leader in the use of geothermal energy for electric power, followed by the Philippines, Indonesia and Mexico, according to the report.

The Krafla plant is Iceland’s largest geothermal power station, a showcase of renewable energy.Iceland Weighs Exporting the Power Bubbling From BelowFEB. 20, 2013 Large projects are planned for Indonesia and East Africa, and some Central and South American countries, such as Chile, are also showing interest. These fast-growing regions are hungry for new electricity sources, and international development banks are helping to finance the projects. (The lower-population New Zealand and Iceland are ranked sixth and seventh in total geothermal use.)

“If you’re wildcatting for geothermal, Africa really is one of those parts of the world where we seem to be going to,” said Maria Richards, coordinator of the geothermal laboratory at Southern Methodist University in Dallas.

At its most basic, geothermal power involves harnessing water heated to steam temperatures in the depths of the earth and using it to spin turbines that produce electricity. The Ring of Fire around the Pacific Ocean, where volcanoes and earthquakes are common, is an optimal source of energy, with high temperatures found relatively close to the surface. In addition to producing electric power, geothermal can also heat and cool homes, an application that can use lower temperatures than electric power production.

As an electricity source, geothermal energy has certain advantages over its main renewable competitors, the sun and wind. It works 24 hours a day, while solar and wind power are intermittent. Geothermal energy generates few planet-warming emissions, and it provides an alternative to hydroelectric power for countries like Kenya and El Salvador that might want to reduce their dependence on dams, said Eckehard Büscher, director of the International Geothermal Office in Germany.

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