Perhaps - new developments in geothermal power
"Geothermal energy has become the forgotten renewable. With solar and wind increasingly dominating the market of green energy, efforts to tap the vast reservoir of heat deep beneath our feet remain stubbornly well behind."
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" At these depths, the heat of the surrounding rock can hit temperatures of around 500 degrees Celsius – enough to transform any liquid water pumped down there into a vapor-like supercritical state that's perfect for generating electricity."
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