That’s damn deep. Ground sourced heating works well, some great vids online. As far as drilling to China for lava, I dunno… I live totally off grid on solar now, and it is mostly great. Occasionally we get 3-4 total poo days of rain and clouds, and the panels make nearly nothing and I have to generator a few hours. I hate the thing. I do have water year round here, so a long term project is pico hydro . I only need a couple hundred watts on 24-7 to take half my load which stretches the batteries into a week, and then it’s a matter of needing 4 solid hours to recharge. Just a shit ton of digging, clearing, plumbing and such to get it online.
I have to contend with harsh winters where the ground freezes at least 6 ft deep and then short winter days might bot be sufficient for solar in the winter. The Pico hydro could work providing I account for having some kind of system to prevent the source water from freezing (rivers and lakes here.can freeze 3ft or more.deep). The other benefit of going deep would be using excess heat to melt snow and ice which could be stored and just keeping the driveway clear all winter.
I have an idea of where you are I think from the temps…. There’s a guy in northern Canada, sells a solar charger kit, wonderful wacky autistic bastard, lives totally on solar. Uses it to heat, and hot water too. Stores the excess as a thermal mass. He ran the number and it’s literally cheaper to do photovoltaic panels ( a ton) than it is to do other methods. Also, panels are cheap. Used $50 each, new $150. With low light high latitude you just over panel by a factor. Double , triple… int he summer you can use the wild excess to run a hot tub.
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