I am currently testing a prototype device to make my vision possible. It's very simple in nature, just Peltier Modules converting surface temperature variations into an electric current. I think the reason why this tech may take off is because it isn't necessarily as intrusive or expensive as full out geothermal energy generation. It is a solid-state system that concentrates solar heat energy on one side and uses the temperature gradient of the soil underneath to create energy. Feel free to reach out to me if you have any questions!