3Sun is a photovoltaic panel factory established in 2010 in Catania, Italy. In 2015, Enel Green Power became the company's sole shareholder. 3Sun was established as a joint venture by Enel Green Power, Sharp Corporation, and STMicroelectronics, each owning 33% of 3Sun. Between 2011 and 2014, 3Sun built a photovoltaic cell and module plant in Catania that employed thin-layer technology. Sharp contributes the amorphous silicon multi-junction thin-film technology, Enel Green Power manages the commercial distribution, and STMicroelectronics provides personnel specialized in processes and research and development. On March 6, 2015, Enel Green Power has been the sole owner of 3Sun.