Photovoltaics continue to make their way into more building products. In 2009, Dow Solar merged the weather protection offered by the tried-and-true form of the asphalt roofing shingle with the energy-generating potential of CIGS thin-film photovoltaic cells to create Dow Powerhouse Solar Shingles. Manufactured in Michigan, the 22.8"-wide-by-10"-high and 0.5"-thick shingles are being gradually rolled out throughout the United States. •