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The fact is that once you get a few feet under the ground, the temperature is constant all year long, and the deeper you go in the earth the warmer it becomes. I believe that the typical ratio is about .5 to 1 degree for every 500 feet down you go.
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Yes, this is why they are trying to dig deeper to get more energy.
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Conventional power plants are based on bores drilled to a depth of between 2km and 3km, but work is now underway at the Resource Park on bores of up to 5km in depth. "The water pumped into those bores will reach an unbelievable pressure and deliver four to five times the power yield of conventional bores," explained Haraldsson.
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I wasn't really referring to getting your own geothermal system in your backyard, but more over I was thinking about the government researching more on geo, to help the start of getting rid of coal power plants and stuff.