These underground heat pumps take trivial land -small-diameter holes drilled 150 m down - low cost, including indoor heating units @100isNowhttps://twitter.com/mzjacobson/status/887491439403204609 …
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Replying to @mzjacobson @100isNow
Can old, abandoned coal mines be reused this way?
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Yes, but "cold" sources work too. In Norway, they use cold water from fjords to heat a town with 300+% efficiency: https://en.wikipedia.org/wiki/Drammen_Heat_Pump …
8:57 AM - 20 Jul 2017
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