Fun factoid: Joey Hess (Debian developer & creator of git-annex) lives/lived in one: https://joeyh.name/blog/entry/hackerholler/

His blog has occasional experiments with off-grid and low-power living.

My next house will be an Earthship. My current house has an amazing permaculture footprint, but I want to demolish it and rebuild. Can't though, so I'm looking for land instead ..