This family lived off-grid for a number of years, relying on batteries and a generator for their electricity, and learning how to conserve it. It was found that this was fairly high-maintenance and, as the home owner aged, it was decided to get grid electricity to help meet some of the lighting, appliance, and computer/internet needs.
The house was built to have most windows facing south for light and heat in the winter (in summer, a number of deciduous trees shade the house, providing cooling during the hottest time of the year). 
The house is spring-fed for all of its water needs. A brook runs close to the home, so the owner is considering micro-hydro energy in the future.
Other features include gardening, to help meet food needs, and a composting toilet.