FWIW, One dream of mine is to find a south slope with a pond at the bottom. It is noticeable that such places turn from white to green first every spring. With maybe 50 vertical feet to a hilltop or knoll, you could have an underground house with a large south window for passive solar, and a skylight for interior light. After burying it all, you can plant trees to encase the home in roots, so that it will become a self-supporting cave if the original walls last a half century. You can put another reservoir upslope, and use a mechanical pump on a windmill to keep it full from the pond. Whenever you need power, you use a hydroelectric generator. No batteries needed, and a windmill you can build and fix yourself. A car tire makes a great start for a simple bellows pump.