Solar Frontier K.K.

Solar Frontier K.K. is a leading Japanese photovoltaic company specializing in the development and manufacturing of advanced CIS (Copper-Indium-Selenium) thin-film solar modules. Established in 2006 as Showa Shell Solar before adopting its current name in 2010, it operates as a wholly owned subsidiary of Showa Shell Sekiyu K.K., now part of Idemitsu Kosan Group. Headquartered in Minato-ku, Tokyo, Japan—with additional offices across Europe, the United States, and Saudi Arabia—Solar Frontier has become renowned for its world-class production capacity; notably operating one of the world’s largest CIS module plants at Kunitomi with nearly 1 GW annual output.
The company’s proprietary CIS technology offers higher real-world electricity yields compared to conventional crystalline silicon panels due to superior performance under partial shading or high temperatures. Solar Frontier emphasizes ecological responsibility by avoiding toxic materials like cadmium or lead in its products. Its offerings span residential rooftops to utility-scale projects worldwide—including significant deployments across Asia, Europe, North America, and the Middle East.
With over 35 years’ experience rooted in energy innovation since the oil crisis era, Solar Frontier continues to set industry benchmarks—achieving record-breaking conversion efficiencies up to 23.35% on laboratory cells—and advancing sustainable energy solutions through ongoing R&D efforts.