Air Products & Chemicals,
Inc.
Anadarko Petroleum Corporation
Ashland Inc.
Atmos Energy Corporation
ATP Oil & Gas
BG Group
BHP Billiton Limited
Borealis A/S
CEPSA Group
Chesapeake Energy Corporation
Chevron Corporation
Chevron Phillips Chemical Company LLC
ConocoPhillips Company
Consolidated Edison Inc.
Delek US Holdings, Inc.
The Dow Chemical Company
E.I. DuPont de Nemours and Company
Eastman Chemical Company
El Paso Corporation
Energy Future Holdings Corp.
ENI S.p.A.
EPCO Inc.
Exxon Mobil Corporation
Hess Corporation
Hexion Specialty Chemicals Inc.
Husky Energy Inc.
Koch Industries, Inc.
LOOP LLC
LyondellBasell Industries AF S.C.A.
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Mærsk Olie og Gas AS
Marathon Oil Corporation
Motiva Enterprises LLC
Murphy Oil Corporation
National Fuel Gas
Nexen Inc
Next Era Energy, Inc
NiSource Inc.
NOVA Chemicals Corporation
NSTAR
Occidental Petroleum Corporation
Ontario Power Generation Inc.
PG&E Corporation
Petroleos de Venezuela S.A. (PDVSA)
Repsol YPF
Santos Limited
Sasol Limited
Sempra Energy
Southern Union Company
Spectra Energy Corp
Statoil ASA
Suncor Petro Cda.
Sunoco Inc.
Talisman Energy
Teck Resources Limited
Tesoro Corporation
TOTAL S.A.
Tronox Incorporated
Valero Energy Corporation
WGL Holdings, Inc.
The Williams Companies Inc.
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