| B.&S.U. | B.&S.U. Beratungs- und Service-Gesellschaft Umwelt mbH | Germany |
| Meteocontrol | meteocontrol GmbH | Germany |
| GEA | Grazer Energieagentur Ges.m.b.H. | Austria |
| APERe | APERe- Association pour la Promotion des Energies Renouvelables | Belgium |
| SOFENA | Sofia Energy Agency | Bulgaria |
| Cenergia | Cenergia Energy Consultants | Denmark |
| SEI-Tallinn | Estonian Institute of Sustainable Development - Stockholm Environment Institute Tallinn Center | Estonia |
| CIRIDD | Centre International de Ressources et d'Innovation pour le Développement Durable | France |
| ISL | International Synergies Limited (formerly: Business Council for Sustainable Development – UK) | Great Britain |
| ESS | Energikontor Sydost | Sweden |
| KÖVET | Környezettudatos Vállalatirányítási Egyesület (Hungarian Association for Environmental Management) | Hungary |
| AESS | Agenzia per l’Energia e lo Sviluppo Sostenibile | Italy |
| LPPC | Latvian Pollution Prevention Centre | Latvia |
| KTU, APINI | Institute of Environmental Engineering | Lithuania |
| Ecofys | Ecofys b.v. | Netherlands |
| KAPE | Krajowa Agencja Poszanowania Energii S.A. | Poland |
| HEMPS | Harghita Energy Management Public Service | Romania |
| Eco-Consulting | Eco Consulting Ltd | Slovenia |
| FFA | Fundació Fňrum Ambiental – Environmental Forum Foundation |
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