Korea Gas Corporation (Kogas)
- Importer and distributor of natural gas, supplying power generation plants, gas utility companies, and city gas companies. [Korean/English]
- http://www.kogas.or.kr/

SK Global Energy Sales Group
- Sells petroleum products including gasoline, diesel, kerosene LPG, and various by-products such as lubricants and asphalt, as well as fuel and service vessels at sea.
- http://www.skes.com/

US Energy Information Administration Country Analysis Brief
- Report on energy sector, including information on oil, gas, coal, and electricity.
- http://www.eia.doe.gov/cabs/skorea.html

SK Corporation
- Oil refining and marketing firm; also makes aviation fuel and lubricants.
- http://eng.skcorp.com/