The Science House
The Science Museum of Minnesota has created a permanent ( but seasonal) attraction called The Science House. This house is designed to be a zero-emissions building. The goal is to produce as much energy as it uses on an annual basis. It includes a passive solar orientation, geothermal heat pumps, integrated solar panel roofing, air tight building envelope, and energy efficient lighting.
I was unable to visit the building due to it being a seasonal facility. So if you plan on visiting- check the hours first!