Japan Energy Corporation
- Active in petroleum, non-ferrous metals, electronic materials and other operations. Runs the Jomo gasoline station chain.
- http://www.j-energy.co.jp/

Nippon Oil Corporation
- Maker of fuel oils, gasolines and solvents, lubricants, metalworking fluids, greases, and asphalt.
- http://www.eneos.co.jp/english/

Tottori Gas Co.
- Manufactures, supplies and sells gas, appliances, installation pipelines and other gas related services. With company information and affiliated companies.
- http://www.tottorigas.co.jp/

Saibu Gas Co. Ltd.
- Produces, supplies, and sells of natural gas in Kyushu. Includes corporate profile, history, and security as well as financial data.
- http://www.saibugas.co.jp/e/

Osaka Gas
- Covers company and shareholder information, guide for investors, safety, R&D activities, environmental actions, annual report, and recipes.
- http://www.osakagas.co.jp/indexe.htm

Hiroshima Gas
- Gives company profile, investor relations, data on subsidiaries and contacts, and timeline of natural gas use in Japan.
- http://www.hiroshima-gas.co.jp/english/index_e.htm

Iwatani International Corporation
- Gas and energy development and supply company. With corporate data, history, and financial data.
- http://www.iwatani.co.jp/eng/

Teikoku Oil
- Oil and natural gas production, development, and supply.
- http://www.teikokuoil.co.jp/eteiseki/

Kanto Natural Gas Development
- Development, production and distribution of natural gas on a commercial basis.
- http://www.gasukai.co.jp/english/

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.
- http://www.gas.or.jp/indexe.html

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.
- http://www.showa-shell.co.jp/english/

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.
- http://www.idemitsu.co.jp/e/

Cosmo Oil Co., Ltd.
- Based in Tokyo. With overview, profile, business activities, financial data, news reports, and environmental publications.
- http://www.cosmo-oil.co.jp/eng/

Tokyo Gas Co., Ltd.
- Supplier for natural gas for residential and business consumption. With environmental and procurement information, news, and investor guide.
- http://www.tokyo-gas.co.jp/index_e.html