The world's first Active House stands at the crest of an estate. Its south-facing roof is covered in solar panels and solar cells, which between them harness more than enough power to keep the occupants warm and the appliances running. In around 30 years' time, if designers have got their sums right, the excess electricity flowing from the house into Denmark's grid will have cancelled out the energy costs of building it, leaving a non-existent footprint on the earth's resources.
Sun Roof: Solar Panel Shingles Come Down in Price, Gain in Popularity
"Residential solar has two main obstacles - expense and aesthetics. Even if I could afford it, my HOA probably wouldn't allow it. All of this could change thanks to Dow Solar Solutions and their Powerhouse shingles. As you can see, the panels look like standard asphalt shingles - and th