- Alliant Energy
- AmerenUE
- Ameren Illinois Utilities
- American Electric Power
- American Water Works Association Research Foundation
- Arizona Public Service Company
- Bluewater Power Distribution
- Bonneville Power Administration
- Boston Edison Company
- Boston Gas
- CAMPUT
- Central Hudson Gas & Electric
- City of Mesa
- Community Energy Cooperative
- Consolidated Edison of New York
- Consortium for Energy Efficiency
- Consumers Power Company
- Council of Energy Resource Tribes
- CPS Energy
- DMEA
- Duke Energy Indiana
- EGIA
- Electric Power Research Institute
- Enbridge Gas Distribution
- Florida Power and Light
- Gulf Power
- Hawaii Electric
- Honeywell Corporation
- Houston Lighting and Power
- Idaho Power
- International Energy Agency
- ISO-New England
- Kansas City Power & Light
- Jacksonville Electric Authority
- LGE Energy
- Los Angeles Dept. of Water and Power
- Maine Public Utilities Commission
- MidAmerican Energy Company
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- Midwest Energy Efficiency Alliance
- Minnesota Power Company
- Montana Power Company
- National Grid
- National Rural Electric Cooperative Association
- National Rural Utilities Cooperative Finance Corp.
- Nebraska Public Power District
- New Jersey Office of Clean Energy
- New England Electric
- NYSERDA
- Northeast Utilities
- Northern States Power
- Northwest Energy Efficiency Alliance
- Nova Scotia Power Inc.
- Ontario Power Authority
- Pacificorp
- Pacific Gas & Electric
- Pawnee Nation
- Piedmont Environmental Council
- PNM
- Primen Corporation
- Progress Energy Carolinas
- Public Service Company of Colorado
- Public Service Electric and Gas Company
- Sacramento Municipal Utility District
- San Diego Electric & Gas Company
- Sempra Energy
- Southern California Edison
- Southwestern Public Service Company
- State of New Jersey
- State of Texas
- Sustainable Energy Ireland
- Tucson Electric Power Company
- Union Gas
- Wisconsin Electric Power Company
- Xcel Energy
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