3E Company, Inc.

A2A S.p.A.
ACEA S.p.A.
AEA Technology plc
AES SeaWest, Inc.
Alkane Energy plc
ALLETE, Inc. [ALE]
Alliant Energy Corporation [LNT]
AMEC Earth & Environmental Inc.
AMEC Geomatrix Consultants, Inc.
Ameren Corporation [AEE]
American Labelmark Company
Analytical Services, Inc.
Aqua-Pure Ventures Inc.
Aquilex Corporation
ATCO Ltd.
Avista Corporation [AVA]

Baden Technologies Inc.
Basin Water, Inc. [BWTRQ.PK]
BBJ Environmental Technologies, Inc. [BBJE.PK]
Beacon Industrial Group, Inc.
BIOQUELL Plc
BPI Energy Holdings, Inc. [BPG]
Business Group Benelux

Caithness Corporation
Calvalley Petroleum Inc.
Canadian Utilities Limited
Carbtrol Corporation
Catalytic Combustion Corporation
CenterPoint Energy, Inc. [CNP]
CH Energy Group, Inc. [CHG]
CHOICE! Energy Services Retail, L.P.
City Gas Pte Ltd
Clearford Industries Inc.
Clipper Windpower Plc
Clyde Bergemann EEC
CMS Energy Corporation [CMS]
CMS Enterprises Company
Commerce Energy Group, Inc. [EGR]
Community Energy, Inc.
Compact Power Holdings plc
Compressco Partners, L.P.
Consolidated Edison, Inc. [ED]
Culligan International Company
CUNO Incorporated

Dalkia plc
Dürr Environmental, Inc.
Decatur Utilities
Denali Incorporated
domnick hunter group
DPL Inc. [DPL]

eaga plc
Ecovation, Inc.
EcoWater Systems LLC
EDF Energies Nouvelles S.A.
EESTech, Inc. [EESH.PK]
EIP Associates
Enerchina Holdings Limited
ENTECH, Inc.
Enterprise Group Holdings Limited
ENVIRON Holdings, Inc.
Environmental Waste Controls ltd
Environmental, Safety & Health, Inc.
Equisol, LLC
Ergon, Inc.
EVN AG [EVNVY.PK]
Exelon Corporation [EXC]
Exelon Energy Company

F.B. Leopold Company, Inc.
Falck S.p.A.
FERSA Energías Renovables, S.A.
First Wind Holdings, Inc.

GDF SUEZ [GDFZY.PK]
GDF SUEZ Energy International
GDF SUEZ Energy North America, Inc.
Geocon Group, Inc.
GeoSyntec Consultants, Inc.
Global Energy, Inc.
Global Environmental Energy Corporation [GEECF.OB]
Global Water Resources, Inc.
Golden Spirit Enterprises, Ltd. [GSPT.OB]
Graver Technologies, Inc.
GreenCore Technology, Inc. [AQUA.PK]
GS Holdings Corp.
Gulfmark Energy, Inc.

H2O Innovation (2000) Inc.
Hargis + Associates, Inc.
HELIX Environmental Planning, Inc.
Hunter Manufacturing Company
Hydranautics

IBERDROLA RENOVABLES, S.A.
INEO Group
Infiltrator Systems Inc.
Integrys Energy Group, Inc. [TEG]

Knife River Corporation
Koç Holding A.S.
Kronos Advanced Technologies, Inc. [KNOS.PK]

LifeSource Water Systems, Inc.

Marsulex Inc.
MEC Analytical Systems, Inc.
MGE Energy, Inc. [MGEE]
Microgenix Technologies Ltd.
MidAmerican Energy Holdings Company
Mintie Corporation
Mirant Corporation [MIR]
MXenergy Inc.

Navitas Energy, Inc.
New Universe International Group Ltd.
NiSource Inc. [NI]
Noble Environmental Power, Inc.
NORESCO
North Wind, Inc.
Northeast Utilities [NU]
Northeast Utilities Service Company
NorthWestern Corporation [NWE]
NV Energy, Inc. [NVE]

Ohio Pure Water Company
Organic Resource Management Inc.
Orival, Inc.
Ozocan Corporation

Pall Aeropower Corporation
PerLorica Inc.
PG&E Corporation [PCG]
PipeHawk PLC
Plambeck Neue Energien AG
PNM Resources, Inc. [PNM]
Porvair plc
Protec, Inc.
PSEG Global L.L.C.
Public Service Electric and Gas Company
Public Service Enterprise Group Incorporated [PEG]

RainSoft
ReliOn, Inc.
Renegy Holdings, Inc.
RMT, Inc.

Salamander Energy PLC
Séché Environnement SA
Séchilienne-Sidec
SCANA Corporation [SCG]
Sea Breeze Power Corp.
SembCorp Industries Ltd
Seprotech Systems Incorporated
Shell International Renewables
Siemens Water Technologies
SMC Systems, Inc.
SolarCraft Services Inc.
Spice plc
Steril-Aire, Inc.
Storm Exploration Inc.
SUEZ Environnement
SUEZ-TRACTEBEL S.A.
Summerleaze Ltd
Summit Energy Services, Inc.
SunEdison

Techem AG
Terranext, LLC
TestAmerica Laboratories, Inc.
Theolia
Thermal Energy International Inc.
Total Energy Services Inc.
Tracer Environmental Sciences & Technologies, Inc.
Trojan Technologies Inc.
TurboSonic Technologies, Inc. [TSTA.OB]

UGI Corporation [UGI]
United Air Specialists, Inc.
United Pumping Service Inc.
United Site Services, Inc.
Unitil Corporation [UTL]
Universal Energy Group Ltd.
USDA Forest Service

Vectren Corporation [VVC]
Veolia Environmental Services Plc

Wahlco, Inc.
WEDECO AG Water Technology
Westar Energy, Inc. [WR]
Western Filter Corporation
Westinghouse Electric Company LLC
Wheelabrator Technologies Inc.
Wisconsin Energy Corporation [WEC]

ZCL Composites Inc.
Zephyr Environmental Corporation
Zodiac Marine & Pool