Original Link: http://www.macrumors.com/2013/11/04/apple-to-build-new-700-employee-sapphire-glass-manufacturing-plant-in-arizona/

Apple is repurposing this First Solar facility to create sapphire glass:

Apple will build a new 700-employee manufacturing facility in Mesa, Arizona, to make sapphire glass, according to releases from the State of Arizona and GT Advanced, a New Hampshire-based materials manufacturing company. Apple purchased the vacant manufacturing building from First Solar, and has contracted with GT Advanced to “own and operate furnaces and related equipment” at the facility.