AEP Ohio

AEP Texas Central

AGL Resources, Inc.

Alabama Gas Corporation

Alabama Power Company

Alabaster Water Board

Alaska Electric Light & Power Company

Albuquerque Bernalillo County Water Authority

Allegheny Energy, Inc.

Allegheny Power Company

Alliant Energy

AltaGas Utilities, Inc.

Ambit Energy

Ameren Corporation

American Electric Power Company, Inc.

AmeriGas Propane

Anaheim Public Utilities

Anchorage Water & Wastewater Utility

APS

Aqualectra

Aquarion Water Company of CT

Aquila, Inc.

Arizona Public Service

Arkansas Oklahoma Gas Corporation

Artesian Water Company

ATCO Electric

ATCO Gas

Atmos Energy Corporation

Austin Energy

Austin Energy 311

Avista Corporation

Avista Utilities

Azusa Light & Water Department

Bailey County Electric Cooperative, Inc.

Baldwin County EMC

Baltimore Gas & Electric Company

Bangor Hydro Electric Company

Barbados Light & Power Company, Ltd.

Barbados Water Authority

Barrow Utilities & Electric Cooperative

Bartholomew County REMC

BC Hydro

Belize Electricity

Benton County PUD #1

Bermuda Electric Light Company

Big Rivers Electric Corporation

Black Hills Corporation

Black Hills Power, Inc.

Blue Ridge Mountain Electric Membership Corporation

Bluebonnet Electric Cooperative, Inc.

Board of Water Supply

Bristol Tennessee Essential Services

Brownsville Public Utilities Board

Bryan Texas Utilities

Burbank Water & Power

California Water Service Company

California Water Service Group

Cambridge and North Dumfries Hydro Inc.

Carteret-Craven Electric Cooperative

Cascade Natural Gas Corporation

Cedar Falls Utilities

CenterPoint Energy

Central Alabama Electric Cooperative, Inc.

Central Electric Cooperative, Inc.

Central Florida Gas Company

Central Hudson Gas & Electric

Central Maine Power Company

Central Vermont Public Service Corporation

Charleston Commissioners of Public Works

Charleston Water System

Charlotte County Utilities

Chelan County Public Utility District #1

Chesapeake Utilities Corporation

Chester Water Authority

Chesterfield County Utilities Department

Chugach Electric Association, Inc.

Cirro Energy

Citizens Energy Group

Citizens Gas

City of Albuquerque

City of Alexandria

City of Ann Arbor

City of Arlington

City of Atlanta

City of Aurora

City of Aurora Water Department

City of Austin

City of Baltimore

City of Bellevue

City of Bellevue Utilities

City of Bloomington Public Works Department

City of Boulder Public Works

City of Buffalo

City of Calgary

City of Carrollton

City of Cedar Rapids

City of Charlotte

City of Charlottesville

City of Cleveland

City of Cleveland Division of Water

City of Columbus

City of Dallas

City of Denton

City of Duncanville

City of Edmond

City of Escondido

City of Fort Worth

City of Fountain Electric

City of Garland

City of Garland Water Utilities

City of Georgetown

City of Grand Rapids

City of Greensboro

City of Hamilton Utilities

City of Henderson

City of High Point

City of Hot Springs

City of Houston

City of Houston Public Works Department

City of Huntington Beach

City of Independence

City of Irving

City of Jackson

City of Kansas City

City of Lakeland

City of Long Beach

City of Lubbock

City of Mesa

City of Ocala

City of Oklahoma City

City of Owensboro

City of Philadelphia

City of Phoenix

City of Plano

City of Portland

City of Richmond

City of Richmond Department of Public Utilities

City of Riverside

City of Rock Hill Utilities Department

City of Rocky Mount

City of Roseville

City of Ruston

City of Sacramento

City of Sacramento Utilities Dept

City of San Antonio

City of San Diego

City of San Diego Water Department

City of San Francisco

City of San Jose

City of San Marcos

City of Santa Rosa

City of Saskatoon

City of Savannah

City of Springfield

City of St Paul

City of Surprise

City of Tacoma

City of Tallahassee

City of Tempe

City of Toledo

City of Tulsa

City of Vineland

City of Virginia Beach

City of Waco

City of West Palm Beach

City of Wichita

City of Wichita Falls

City of Wilmington

City Utilities of Springfield

Clallam County Public Utility District #1

Clark County Water Reclamation District

Clark Public Utilities

Clayton County Water Authority

Cleco Corporation

Cleco Power LLC

CMS Energy

Cobb EMC

Cobb Energy

ComEd

Comgas - Compania De Gas Sao Paulo

Commerce Energy Group, Inc.

Commissioners of Public Works

Co-Mo Electric Cooperative, Inc.

Connecticut Water Company

Connexus Energy

Consolidated Utility District

Constellation Energy Group, Inc.

Consumers Energy

Corinth Gas & Water Dept

Corn Belt Energy Corporation

CoServ Electric

County of Henrico

County of Sacramento

Cowlitz County Public Utility District #1

CPS Energy

Cuivre River Electric Cooperative, Inc.

Cumberland Electric Membership Corporation

Dallas Water Utilities

Dayton Power & Light Company

DC Government 311

DC Water & Sewer Authority

Delmarva Power

Delta Natural Gas Company, Inc.

Denver Water

Des Moines Water Works

Detroit Water & Sewerage Department

Direct Energy

Direct Energy Business Services

Direct Energy Marketing Limited

District of Columbia Government

Division of Water, Cleveland Ohio

Dominion Hope

Dominion Resources Services

Dominion Virginia Power

DTE Energy Corporation

Duke Energy

E.ON US

East Bay Municipal Utility District

East Valley Water District

Eastern Propane & Oil

Ecogas Mexico

Ecogas Mexico, S. De R.L. De C.V.

Econnergy Energy Company, Inc.

Edmond Electric

El Paso Electric Company

Elk Grove Water Service

Elmar

Enbridge Gas Distribution

ENERGEX

Energy Future Holdings

Energy Savings Group

Energy West, Inc.

EnergySouth, Inc.

Enersource Hydro Mississauga

ENMAX Energy Corporation

Enwin Utilities

EPB of Chattanooga

EPCOR Utilities, Inc.

Exelon Corporation

Exelon Energy Delivery

Fairfax County Water Authority

Fall River Electric Cooperative, Inc.

Farmers Electric Cooperative, Inc.

Fayetteville Public Works Commission

Firelands Electric Cooperative, Inc.

First Choice Power

FirstEnergy Corp.

Flint Energies

Florida Municipal Electric Association

Florida Power & Light Company

FortisAlberta

FortisBC

Fountain Utilities

Four County Electric Power Association

Fulton County

Gainesville Regional Utilities

Garland Power & Light

GEN-SYS Energy

Georgia Natural Gas

Georgia Power Company

Gexa Energy

Gexa Energy, a Subsidiary of FPL Group

Glendale Water & Power

Golden State Water Company

Golden Valley Electric Association, Inc.

Grand Valley Rural Power Lines

Granger Hunter Improvement District

Grant County Public Utilities District #2

Grays Harbor Public Utility District #1

Great Lakes Energy Cooperative

Green Mountain Energy Company

Greenville Utilities Commission

Greenville Water System

Guadalupe Valley Electric Cooperative, Inc.

Guam Waterworks Authority

Hampton Roads Sanitation District

Harrisonburg Electric Commission

Hawaiian Electric Company, Inc.

Hawaiian Electric Light Company

Heartland Rural Electric Cooperative

Highline Electric Association

Hillsborough County Florida Water Dept

Hillsborough County Public Utilities Department

Hillsborough County Water Department

Honolulu Board of Water Supply

Hood River Electric Cooperative

Horizon Utilities Corporation

Horry Electric Cooperative, Inc.

Huntsville Utilities

Hydro One Networks, Inc.

Hydro Ottawa

Idaho Power Company

Imperial Irrigation District

Independent Electricity System Operator

Indianapolis Power & Light Company

Infinite Energy, Inc.

Integrys Energy Group, Inc.

Intermountain Gas Company

Intermountain Rural Electric Association

Islamabad Electric Supply Company

Jackson Energy Authority

Jackson Energy Cooperative

Jackson Purchase Energy Corporation

Jamaica Public Service Company, Ltd

JEA

Johnson County Wastewater

Jones-Onslow Electric Membership Corporation

Kansas City Board of Public Utilities

Kansas City Power & Light Company

Kenya Power & Lighting Company, Ltd.

KeySpan Energy Corporation

Keyspan Energy Delivery

Kinder Morgan, Inc.

Kissimmee Utility Authority

Knoxville Utilities Board

Laclede Gas Company

Lafayette Utilities System

Lansing Board of Water & Light

Las Vegas Valley Water District

Lee County Electric Cooperative, Inc.

Lewes Board of Public Works

Lincoln Electric System

Linn County Rural Electric Cooperative

Long Beach Water Department

Long Island Power Authority

Los Angeles Department of Water & Power

Lubbock Power & Light Company

Madison Gas & Electric Company

Manatee County Government

Manatee County Utilities Customer Service

Manitowoc Public Utilities

Marietta Board of Lights & Water

Marin Municipal Water District

Marquette Board of Light & Power

Martin County

Martin County Utilities

Maryland Public Service Commission

Mayors Office of Information Services

McMinnville Water & Light Department

Medina Electric Cooperative, Inc.

Memphis Light, Gas & Water Division

Metro Water Services

Miami-Dade Water & Sewer Department

Mid American Energy

MidAmerican Energy Company

Mid-Carolina Electric Cooperative, Inc.

Midwest Energy Cooperative, Inc.

Midwest Energy, Inc.

Minnesota Power, Inc.

Miton Hydro Distribution

Mobile Area Water & Sewer

Mobile Gas Service Corporation

Modesto Irrigation District

Montana-Dakota Utilities Company

Montgomery County

Montgomery Water Works & Sanitary Sewer Board

Montgomery Water Works Board

Muscatine Power & Water

N.V. Elmar

Nashville Electric Service

National Fuel Gas Company

National Grid Massachusetts

National Grid New York

National Grid USA

National Water Commission

Nebraska Public Power District

Nevada Power Company

New Jersey Natural Gas Company

New River Light & Power

Newfoundland Power, Inc.

Newport News Department of Public Uitilites

Newport News Water Works

Nicor Gas

Nicor, Inc.

NiSource, Inc.

Northeast Oklahoma Electric Cooperative

Northeast Utilities

Northeastern Rural Electric Membership Cooperative

Northern Indiana Public Service Company

NorthWestern Energy

Npower

NV Energy

NW Natural Gas Company

NYC Dept of Environmetal Protection
Bureau of Customer Service

NYSEG Solutions

OGE Electric Services

Oklahoma Electric Cooperative

Omaha Public Power District

Oncor Electric Delivery

Oncor Energy

Orange County Government

Orange County Utilities

Orlando Utilities Commission

Otter Tail Power Company

Owensboro Municipal Utilities

Pacific Gas & Electric Company

PacifiCorp

Paragon Water

Park Water Company

Pasadena Water & Power Department

Pedernales Electric Cooperative, Inc.

Pend Oreille Public Utility District

Peninsula Light Company

Pepco Holdings, Inc.

Perennial Public Power District

Peru Utilities

PG&E Corporation

PHI, Inc.

Philadelphia Gas Works

Phoenix Water Services Department

Piedmont Natural Gas Company, Inc.

Pierce County Public Works & Utilities

Pinellas County Utilities

Pinnacle West Capital Corp

Pioneer Rural Electric Cooperative, Inc.

PNM Resources

Portland General Electric Company

Portland Water Bureau

Potomac Electric Power Company

PPL Corporation

PPL Electric Utilities

Progress Energy Carolinas

Progress Energy Florida

Progress Energy Inc.

Progress Energy Service Company

Provo City Power

PSE&G

Public Service Commission of DC

Public Service Enterprise Group

Public Utility Commission of Texas

Public Utility District No. 1 of Pend Oreille County

Public Works Commission

Puerto Rico Electric Power Authority

Puget Sound Energy, Inc.

Qatar General Electricity & Water

Questar Corporation

Questar Gas Company

Rappahannock Electric Cooperative

Region of Peel

Regional Municipality of Durham

Regional Municipality of Peel

Regional Water Authority

Reliance Home Comfort

Reliance Limited Partnership

RGC Resources, Inc.

Richmond Power & Light

Sacramento County Utilities Billing Service

Sacramento Municipal Utilities District

Salt River Project Power

Sam Houston Electric Cooperative, Inc.

San Antonio Water System

San Bernard Electric Cooperative, Inc.

San Diego Gas & Electric

San Francisco Public Utilities Commission

San Jose Water Company

Santee Cooper Power

Santee Electric Cooperative, Inc.

SaskEnergy, Inc.

SaskPower

Sawnee Electric Membership Corporation

SCANA  Energy

SCANA Corporation

Seattle City Light

Seattle Public Utilities

Sempra Energy

Sempra Global

Shelby Electric Cooperative

Sierra Pacific Resources

Snapping Shoals Electric Membership Corporation

Snohomish County Public Utility District #1

South Central Indiana Rural Electric Membership Cooperative

South Jersey Gas Company

South Jersey Industries, Inc.

South Tahoe Public Utilities District

Southeast Alabama Gas District

Southern California Edison Company

Southern California Water Company

Southern Company

Southern Maryland Electric Cooperative, Inc.

Southern Rivers Energy

SouthStar Energy Services

Southwest Gas Corporation

Southwest Water Company

Spark Energy

Springfield Utility Board

St Paul Regional Water Services

St. Lucia Electricity Services Ltd

St. Vincent Electricity Services Limited

StarTex Power

Stream Energy

Stuyvesant Energy

Suburban Water Systems

Sunrise Water Authority

Superior Water, Light & Power Company

Tacoma Power

Tacoma Public Utilities

Tacoma Water

Tampa Electric Company

TECO Energy, Inc.

Tennessee Valley Authority

Terasen Gas, Inc.

Texas-New Mexico Power Company

The Empire District Electric Company

The Empire District Gas Company

The Energy Network

Tohono O'odham Utility Authority

Truckee Meadows Water Authority

TSE Services

Tualatin Valley Water District

Tucson Electric Power Company

Tucson Water

Turlock Irrigation District

TXU Energy

UGI Utilities, Inc.

Union Fenosa SA

Union Gas Limited

Unisource Energy Services

United Illuminating Company

United Power, Inc.

United Water

Upper Peninsula Power

Utility Shared Services

Valencia Water Company

Vectren Corporation

Vectren Energy Delivery

Vermont Electric Cooperative, Inc.

Vermont Gas Systems, Inc.

Virgin Islands Water & Power Authority

Virginia Beach Department of Public Utilities

W.E.B. Aruba N.V.

Walnut Valley Water District

Walton Electric Membership Corporation

Wasco Electric Cooperative, Inc.

Washington DC 311

Washington Gas

Washington Gas Energy Services, Inc.

WE Energies

Westar Energy

Western Power Corporation

Wheat Belt Public Power District

White House Utility District

Wichita Water & Sewer

Wisconsin Public Service Corporation

Xcel Energy, Inc.

York Water Company