Google, Inc. announced plans to invest $10 million in an energy technology known as enhanced geothermal systems, or EGS. While conventional geothermal power plants generate electricity using ultra-hot steam stored in natural reservoirs one or two miles below the earth's surface, EGS can theoretically tap heat in dry rock by pumping cold water into artificial underground reservoirs. (Google produced this video to show how it works.)
While geothermal energy offers a renewable alternative...
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