In twenty-four countries around the world, tackling these drawbacks is proving worthwhile because geothermal power can provide reliable, abundant, and affordable electricity, with low operational costs over its lifetime. In El Salvador and the Philippines, geothermal accounts for a quarter of national electric capacity. In volcanic Iceland, it is one-third. In Kenya, thanks to the activity beneath Africa’s Great Rift Valley, fully half of the country’s electricity generation is geothermal—and growing. Though less than .5 percent of national electricity production, U.S. geothermal plants lead
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