Barrett Resources, Burlington Resources, Coastal, Duke Energy, Empresa de Energía de Bogotá, ExxonMobil, hunt Oil, Hyundai, Interconexion Eletrica, Maple Production, Occidental Petroleum, Petrobas, Petro-Tech, Phillips Petroleum, Pluspetrol, Repsol-YPF, Sapet, Shell, SK Corp., Sonatrach, Technit, Tractebel, Transelca.
fuente: Energy Information Administration

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