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AES Corporation (The)
AGL Resources Inc,
Algonquin Power & Utilities Corp.
Alliant Energy Corporation
American Electric Power Service Corporation
American Transmission Company LLC.
Associated Electric Cooperative, Inc.
Atmos Energy Corporation
Basin Electric Power Cooperative
Berkshire Hathaway Energy
Black Hills Corporation
British Columbia Hydro and Power Authority
California Independent System Operator
CenterPoint Energy, Inc.
Central Arizona Water Conservation District
Chesapeake Energy Corporation
Chugach Electric Association, Inc.
Citizens Energy Group
City of Richmond, Department of Public Utilities
City Public Service of San Antonio, Texas
City Utilities of Springfield, MO
CMS Energy Corporation
Colorado Springs Utilities
Columbia Pipeline Group, Inc.
Consolidated Edison Company of New York, Inc.
Crestwood Holding Partners LLC
Dairyland Power Cooperative
Deseret Generation & Transmission Co-operative
Devon Energy Corporation
Dominion Energy, Inc.
Doyon Utilities, LLC
DQE Holdings LLC
DTE Energy Company
East Kentucky Power Cooperative, Inc.
El Paso Electric Company
Electric Reliability Council of Texas, Inc.
Electric Transmission Texas, LLC
Empire District Electric Company (The)
Empire Gen Holdings, Inc.
Enable Midstream Partners, LP
Energy Future Holdings Corp.
Energy Transfer Equity, L.P.
EOG Resources, Inc.
Florida Municipal Power Agency
Gaz Metro Inc.
Great Plains Energy Incorporated
Great River Energy
Hawaiian Electric Industries, Inc.
Heorot Power Holdings LLC
Hoosier Energy Rural Electric Cooperative Incorporated
Hydro One Inc.
Imperial Irrigation District
Intermountain Power Agency/Intermountain Power Service Corporation
Iroquois Gas Transmission System, L.P.
ISO New England Inc.
ITC Holdings Corporation
JEA and FP&L d/b/a St. Johns River Power Park
Kinder Morgan, Inc.
LDC Funding LLC
Long Island Power Authority
Los Angeles Department of Water and Power
Magellan Midstream Partners, L.P.
MDU Resources Group, Inc.
Metropolitan Water District of Southern California
MGE Energy, Inc.
Midcontinent Independent System Operator, Inc.
Missouri Basin Municipal Power Agency d/b/a Missouri River Energy Services
Modesto Irrigation District
Mountaineer Gas Company
National Fuel Gas Company
National Grid, plc
National Grid USA
New Jersey Resources Corporation
New York Independent System Operator, Inc.
New York Power Authority
NextEra Energy, Inc.
Northern California Power Agency
Northwest Natural Gas Company
NRG Energy, Inc.
NRG Yield, Inc.
NV Energy, Inc.
OGE Energy Corp.
Oglethorpe Power Corporation
Ohio Gas Company
Ohio Valley Electric Corporation
Old Dominion Electric Cooperative
Oncor Electric Delivery Holdings Company LLC
ONE Gas, Inc.
Ontario Power Generation Inc.
Orlando Utilities Commission
Otter Tail Corporation
Pepco Holdings, Inc.
Philadelphia Gas Works
Piedmont Natural Gas Company, Inc.
Pinnacle West Capital Corporation
PJM Interconnection, L.L.C.
Plains All American Pipeline, L.P.
PNM Resources, Inc.
Portland General Electric Company
PowerSouth Energy Cooperative
Public Service Enterprise Group Incorporated
Public Utility District No. 1 of Douglas County, Washington
Public Utility District No. 2 of Grant County, Washington
Public Utility Risk Management Services Joint Self Insurance Fund
Puget Energy, Inc.
QEP Resources, Inc.
RGC Resources, Inc.
Sacramento Municipal Utility District
Salt River Project Agricultural Improvement and Power District
SEMCO Holding Corp.
Seminole Electric Cooperative, Inc.
Seventy Seven Energy Inc.
Sharyland Utilities, L.P.
South Carolina Public Service Authority
South Mississippi Electric Power Association
Southern Star Central Corp.
Southwest Gas Corporation
Southwest Power Pool, Inc.
Spectra Energy Corp.
Summit Utilities, Inc.
Talen Energy Corporation
Tallgrass GP, LLC
Targa Resources Corp.
TECO Energy, Inc.
Tennessee Valley Authority
Tri-State Generation and Transmission Association, Inc.
Vermont Electric Power Company
WEC Energy Group, Inc.
Westar Energy, Inc
WGL Holdings, Inc.
Williams Companies, Inc. (The)
WPX Energy, Inc.
Xcel Energy Inc.