Engineered geothermal system wells go deeper into the Earth than those tapping into natural geothermal energy sources. Using the same machines that drill oil wells, an engineered well can be drilled between 1.9 and 6.2 miles (3 to 10 kilometers) into the rock. The temperature of the rock is 160 to 600 degrees Fahrenheit (71 to 315 degrees Celsius).
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