Cosmo Oil Co., Ltd.: Based in Tokyo. With overview, profile, business activities, financial data, news reports, and environmental publications.
Hiroshima Gas: Gives company profile, investor relations, data on subsidiaries and contacts, and timeline of natural gas use in Japan.
Idemitsu Kosan Co., Ltd.: With company outline, history, policies, accounts statement, procurement of petroleum, refining, distribution and sales, alternative energy, R&D, petrochemicals, societal and cultural activities, and museum. Based in Tokyo.
Iwatani International Corporation: Gas and energy development and supply company. With corporate data, history, and financial data.
Japan Energy Corporation: Active in petroleum, non-ferrous metals, electronic materials and other operations. Runs the Jomo gasoline station chain.
Japan Gas Association (JGA): Comprised of city gas utilities to promote the use of natural gas as a power source, seek beter tax provisions and subsidies, promote safety and technology development, and conduct PR activities.
Kanto Natural Gas Development: Development, production and distribution of natural gas on a commercial basis.
Nippon Oil Corporation: Maker of fuel oils, gasolines and solvents, lubricants, metalworking fluids, greases, and asphalt.
Osaka Gas: Covers company and shareholder information, guide for investors, safety, R&D activities, environmental actions, annual report, and recipes.
Saibu Gas Co. Ltd.: Produces, supplies, and sells of natural gas in Kyushu. Includes corporate profile, history, and security as well as financial data.
Showa Shell Sekiyu K.K.: Business activities of the Shell Group consist of oil exploration and production, oil products, gas and power, chemicals, IT, and renewable energy.
Teikoku Oil: Oil and natural gas production, development, and supply.
Tokyo Gas Co., Ltd.: Supplier for natural gas for residential and business consumption. With environmental and procurement information, news, and investor guide.
Tottori Gas Co.: Manufactures, supplies and sells gas, appliances, installation pipelines and other gas related services. With company information and affiliated companies.