http://www.digitaljournal.com/article/38474

Huge Solar Roof at Akademie Mont-Cenis

Posted Oct 6, 2006 by KeithLDick

http://www.treehugger.com/files/2006/10/integrated_sola.php

Kudos for their efforts. Now if they can get the efficiency up about 50% this could be the way to go.
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The Akademie Mont-Cenis in Germany has a glass roof canopy that creates a "micro-climate" for the building's interior (see more details here). The roof also features integrated solar cells that produce about 700,000 kWh of energy per year.