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Chicago's Willis Tower To Become Vertical Solar Farm 227

An anonymous reader writes "The tallest building in the United States is set to become a soaring vertical solar farm, as Pythagoras Solar just launched a project to emblazon the building's glass façade with transparent photovoltaic panels. The new windows, dubbed high power density photovoltaic glass units, are a clever hybrid technology that lays a typical monocrystalline silicon solar cell horizontally between two layers of glass to form an individual tile. An internal plastic reflective prism directs angled sunlight onto the solar cells but allows diffuse daylight and horizontal light through. The high-profile project will begin on the south side of the 56th floor and could grow up to 2 MW in size — which is comparable to a 10-acre field of solar panels."

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