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quote:Originally posted by daveshortsA major obstical is how expensive drilling the hole is compared to the amount of heat you get out, in most parts of the earth - not iceland, or I guess hawaii. Especially as the places with good heat flow are normally associated with very hard rocks.
quote:350 degrees F at depth - 20,000 + feet. I have seen greater temperatures, too.
quote:The small heat sink created by the well bore is negligable compared to the huge amount of heat contained in the rocks. ... Temperature in these wells approaced 350 degrees F at depth - 20,000 + feet. I have seen greater temperatures, too.