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Cylindrical CIGS-based thin-film PV specialist Solyndra has passed the US$2 billion in sales backlog with the signing of a new long-term sales agreement with German systems integrator Umwelt-Sonne-Energie GmbH, worth US$238 million through 2013. Unlike other thin-film producers, Solyndra is specifically targeting only rooftop installations, due to its unique solar system technology that is claimed to generate more electricity on an annual basis, compared to other technologies from typical low-slope commercial rooftops. In October 2008 Solyndra’s backlog stood at US$1.2 billion and has since secured over US$800 million in long-term contracts.