Energy efficiency
| Energy & Sustainable Development Magazine |  |
www.2e2d.info | Data & information resources, Energy efficiency, Environment, Europe, Sustainable development | English, French |
| Fuel Cell Europe |  |
www.fuelcelleurope.org | Energy efficiency, Europe | English |
| The Information Gateway for Renewable Energy and Energy Efficiency - REEGLE |  |
www.reegle.info | Data & information resources, Energy efficiency, International, Renewable energy | English, French, German, Italian, Spanish |
| Alliance to Save Energy - ASE |  |
www.ase.org | Energy efficiency, International | English |
| .IEA Demand Side Management - IEA-DSM |  |
dsm.iea.org | Energy efficiency, International | English |
| ENERGY STAR |  |
www.energystar.gov | Energy efficiency, International | English |
| The International Energy Agency - IEA |  |
www.iea.org | Energy efficiency, International | English, French |
| International Institute for Energy Conservation - IIEC |  |
www.iiec.org | Energy efficiency, International | English |
| .Polish Foundation for Energy Efficiency - FEWE |  |
www.fewe.pl | Energy efficiency, Poland, Sustainable development | Polish, English |
| National Energy Conservation Agency - NAPE |  |
www.nape.pl | Energy efficiency, Poland | Polish, English |