Since the foundation of GP Solar exists a successful partnership between GP Solar and centrotherm photovoltaics AG. Since 2008 GP Solar is an effective member of the centrotherm photovoltaics group. So the competence units Inspect, Materials and Consulting complement the activities of centrotherm photovoltaics AG.

Centrotherm photovoltaics AG, headquartered in Blaubeuren, is the world's leading technology and equipment providers for the photovoltaics sector. The broad product spectrum comprises key equipment and turnkey production lines for crystalline and thin-film solar modules. The product range is supplemented equipment for the manufacturing of solar silicon. centrotherm photovoltaics guarantees its customers important performance parameters such as production capacity, degree of efficacy, and completion deadlines for turnkey lines. The Group employs around 1,400 staff members, and operates in Europe, Asia and the USA. In the 2010 financial year centrotherm photovoltaics achieved revenue of EUR 624,2 million, EBIT of EUR 75.4 million, and is listed in the TecDax of the Frankfurt Stock Exchange.