Idemitsu Kosan Co., Ltd. operates in the petroleum, basic chemicals, functional materials, power and renewable energy, and resources businesses across Japan, Asia, Oceania, North America, and other international markets. Its Petroleum segment produces, sells, imports, exports, and trades refined petroleum products such as sustainable aviation fuel, synthetic fuel, bio mixed fuel, and carbon offset fuel, and operates service stations offering car wash, vehicle inspection, and maintenance services. The Basic Chemicals segment produces and sells olefin and aromatic products, including ethylene, propylene, linealene/alpha olefin, paraxylene, cyclohexane, and styrene monomer. The Functional Materials segment offers lubricants, advanced materials, performance chemicals, electronic materials, bitumen/functional paving materials, and agricultural biotechnology products such as pesticides and functional feed products. The Power and Renewable Energy segment generates thermal, solar, and wind power, sells electricity, and operates a solar cell business, while the Resources segment explores, develops, produces, and sells crude oil, natural gas, and coal, and engages in geothermal power generation. Founded in 1911, the company is headquartered in Chiyoda, Japan.