Probably in geothermal form. At the core of the earth is an incredibly hot—the core is estimated to be as hot as 9,800.6 ºF or 5,427 ºC—water boils at 100ºC and can provide nearly unlimited amounts of energy at highly geothermal sites, like Iceland. The earth also stores energy in solar radiation slightly below the earth’s surface, which allows geothermal heating/cooling systems to be so efficient when converting the energy in the earth’s surface to your desired temperature.
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