In Europe, where they build to last, few builders put cheap asphalt shingles on houses, and Eternit Fiber-cement shingles are common. Atlantis Energy fits them out with solar cells; a standard installation of 216 Sunslates will crank out about 3 KW and take up about 300 square feet of roof.
Sunslates: Solar Powered Shingles (TreeHugger)
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