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I went to eng. school in Klamath Falls, OR where there is abundant and relatively easy to tap geothermal. There are some efforts around Newberry crater (near Bend) to "indirectly" tap geothermal. A dry supply and return well are dug, using some of the nasty chemicals from natural gas fracking. And so, some of the same environmental issues go along with it. Water is pumped through the wells to extract the heat.