A

Air Liquide
Air Products
Alliance Pipeline
American Gas Association (AGA)
Anadarko
API
Aux Sable

B

BP
Belle Fourche Pipeline
Boardwalk
Buckeye

C

Calpine
CenterPoint Energy
Centurion Pipeline
ChevronPhillips
Chevron
CITGO
Colonial Pipeline
ConocoPhillips
Countrymark Cooperative
CPS Energy
Crosstex Energy Services

D

DCP Midstream
Denbury Resources
Devon Energy
Dixie Pipeline
Dominion
DuPont Chemicals

E

El Paso
Enbridge
Energy Transfer
Energy XXI
Enterprise
Equistar
Equitable
EXCO Resources
Explorer Pipeline
ExxonMobil

G

Golden Pass Pipeline
GulfSouth Pipeline

H

Hilcorp Energy Co.
Holly Energy Partners
Houston Fuel Oil
Hughes Natural Gas
Huntsman

I

INGAA Foundation

K

Kern River Gas
Kinder Morgan
Koch Industries

L

Lavaca Pipeline
LA Office of Emergency Prep.
Laurel Fuel
Lyondell

M

Magellan Midstream Partners
Marathon Petroleum
Mirant
Montana Refining Co.
Motiva

N

Navajo Nation
Nippon Oil Exploration
NiSource

O

Occidental Petroleum
Ocensa Pipeline
Oiltanking

P

PB Energy
PG&E
Pioneer
Placid Refining
Plains All American
Portland Pipeline Corp.
Praxair
Progress Energy

S

Sasol North America
SemGroup
Shell
Spectra
Southern Star
Southwest Gas
Suncor
Sunoco

T

Tesoro
Texas Gas Service
Texas Gas Transmission
TOTAL Petrochemicals

V

Valero
Vectren
Vinson & Elkins

W

West Texas Gas
Williams Gas Pipeline
Williams Midstream
Wolverine
Wyoming Refining