RE:SOLR/TESLA/BRIDGESTONE!?!?!Mercedes had a model with a solar panel roof a few years ago.The big change will be when hopefully the building code changes to have panels incorporated in all new builds with led lighting now a couple of panels are enough to at least power all the lighting.Homes in most of Western Europe are 50 % more efficient than North american builds.We are 25 years behind here in incorporating best available technologies.