| Association for the Conservation of Energy |
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| Association of Energy Producers |
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| Baxi |
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| Beacon Energy |
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| B&Q |
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| The British Electrotechnical & Allied Manufacturers' Association (BEAMA) |
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| British Gas |
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| British Hydropower Association |
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| British Wind Energy Association |
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| Business Council for Sustainable Energy UK |
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| Chartered Institution of Building Services Engineers |
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| Cogen Europe |
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| Combined Heat & Power Association |
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| Campaign to Protect Rural England |
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| EDF Energy |
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| EIS Group |
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Electrical Heating and Ventilation Association |
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| Energy Institute |
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| Energy Saving Trust |
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| e.on |
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| Fuel Cells UK |
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| Green Alliance |
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| Ground Source Heat Pump Association |
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| Hammond PR's Green Energy Group |
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| Ice Energy Heat Pumps Ltd |
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| Institution of Civil Engineers |
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| Institution of Engineering & Technology |
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| Institution of Mechanical Engineers |
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| Kingspan |
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| Mark Group |
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| Mitsubishi Electric UK |
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| NEA |
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| Npower |
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| Renewable Energy Association |
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| Rolton Group |
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| Scottish Power |
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| Scottish Renewables |
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| Solar Century |
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| Society of British Gas Industries |
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| Solar Trade Association |
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| Solartwin |
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| UK LPG Association |
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| Vaillant Ltd |
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