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One of the main costs when harvesting geothermal energy is the digging itself. Just like oil wells, geothermal wells have to be several kilometers deep, because temperature rises along by 50 degrees Celsius with every kilometer. This is where abandoned oil wells could help generate clean electricity.
A team of researchers from the Chinese Academy of Sciences in Guangzho, led by Xianbiao Bu, have devised a method to get the heat specific to the depths of old oil and gas wells and transform it into electricity.
