Dow Solar, Midland, Mich., recently appointed three Colorado roofing contractors as its first authorized dealers to sell Powerhouse Solar Shingles. Academy Roofing, Aurora, Colo.; B&M Roofing of Colorado Inc., Fort Collins, Colo.; and D&D Roofing, Commerce City, Colo., now provide the Colorado residential market with Dow's Powerhouse solar shingles. The solar shingles combine a roofing shingle with a solar cell, enabling them to be installed by a roofer along with standard asphalt roofing