| Abbreviation | Definition |
|---|---|
| IEEJ | Institute of Energy Economics Japan |
| IEEL | Institute for Environmental and Energy Law |
| IEEO | Iran energy efficiency organization |
| IEEP | Innovative Energy Efficiency Project |
| IEER | Integrated Energy Efficiency Ratio |
| IEES | Institute for Energy and Environmental Sustainability |
| IEES | Institute of Environment Energy and Sustainability |
| IEET | Institute for Engineering and Energy Technologies |
| IEET | Institute of Energy and Environmental Technology |
| IEEU | Institute for Energy Efficiency of Ukraine |
| IEF | IMDEA Energy Framework |
| IEF | International Energy Forum |
| IEG | International Energy Group |
| IEGC | Indian Electricity Grid Code |
| IEH | Integrative Energy Healing |
| IEIA | Incentives for Energy Independence Act |
| IEIB | International Energy Insurance Brokers |
| IEIC | International Energy Information Community |
| IEJ | International Energy Journal |
| IEME | Industrial Environmental Management and Energy |