The population of Greka Energy is 200.
Greka Energy was created in 1999.
Greka China was created in 1992.
Oil exploration companies include Anadarko Petroleum Corporation, Apache Corporation, Chevron Corporation, ConocoPhillips, Continental Resources, Devon Energy, ExxonMobil, and Greka Energy. For a more exhaustive list, see the Wikipedia article "List of oil exploration and production companies."
IGS Energy's population is 300.
The population of TECO Energy is 4,300.
The population of Pengrowth Energy is 2,008.
The population of Spectra Energy is 5,500.
The population of Opus Energy is 406.
Cenovus Energy's population is 2,009.
The population of Massey Energy is 5,850.
Husky Energy's population is 4,700.
The population of Solid Energy is 772.