This is the corporate site of Idemitsu Kosan, which aims to be a main player in energy and carbon-neutral solutions in a carbon-neutral and recycling-oriented society by 2050.

Idemitsu Kosan Co., Ltd. (出光興産株式会社, Idemitsu Kōsan kabushiki gaisha; stylized in logo as idemitsu) is a Japanese petroleum company. It owns and operates oil platforms, refineries, …

Company Description: Idemitsu Kosan is Japan's second-largest oil refiner. At its refineries in Japan (processing 945,000 barrels of crude oil per day) Idemitsu Kosan produces petroleum …

Idemitsu Kosan Co.,Ltd. Idemitsu Kosan Co.,Ltd. founded 1911, is one of Japan’s largest energy and resource companies. With more than 60 offices in 20 nations and regions around the …

Idemitsu Plantec Aichi CO., LTD. Idemitsu Plantec Tokuyama CO., LTD. Isewan Sea Berth Co., Ltd. Marubeni Energy Corporation Astomos Energy Corporation HOKKAIDO OIL JOINT …

Oct 30, 2025 · Idemitsu Kosan Co., Ltd. explores, imports, refines, and distributes petroleum and its related products. The Company also manufactures and sells petrochemical products.

Idemitsu Kosan Co., Ltd. is a leading energy company in Japan. We specialize in advanced materials, including CIGS solar cells. Our mission is to drive technological advancements that …