| ERG | Energy Research Group | In English | |
| ERTG | Economic Radioisotope Thermoelectric Generator | In English | → Nuclear technology → Electrical engineering |
| ESM | Energy Storage Module | In English | |
| ESP | Énergie et Systèmes de Propulsion | In French | → Vehicle engineering |
| ESPC | European Space Power Conference | In English | → Spaceflight engineering, astronautics |
| ESS | Energy Storage Subsystem | In English | |
| EST | Energy Saving Trust | In English | |
| ESTAG | Energie Steiermark AG (www.e-steiermark.com) | In German | |
| ESTIF | European Solar Thermal Industry Federation (www.estif.org) | In English | → Organizations and associations |
| ESTTP | European Solar Thermal Technology Platform = ESTTP | Europäische Solarthermie-Technologieplattform | In German |
In English | |
| ESTTP | Europäische Solarthermie-Technologieplattform = (look above) |
In German | |
| ESV | Energiesparverband | In German | → Organizations and associations |
| ETI | Energy Technology Initiative | In English | |
| ETS | Energy Transfer System | In English | |
| EuroACE | European Alliance of Companies for Energy Efficiency in Buildings | In English | → Organizations and associations → Building |
| EVI-GTI | The European Virtual Institute for Gas Turbine Instrumentation | In English | → Mechanical engineering |
| EWG | Energy Working Group | In English | → Organizations and associations → International relations |
| FAEN | Fundación Asturiana de la Energía | In Spanish | → Foundations |
| FCE | Fédération Chimie Énergie | In French | → Organizations and associations → Labour, labour economics → Chemical technology |
| FHYM | Forces Hydrauliques de Meuse | In French | |
| FITCO | Fuel International Trading Corporation | In English | |
| FNME | Fédération Nationale des Mines et de l'Énergie | In French | → Organizations and associations → Mining |
| FNR | Fachagentur Nachwachsende Rohstoffe | In German | → Municipal administration → Agricultural sciences |
| FR2E | Formation Recherche Études Énergie | In French | → Education |
| GDF | Gaz de France (www.gazdefrance.com) | In French | |
| GEA | Grazer Energieagentur | In German | |
| GEAL | Galway Energy Agency Limited | In English | |
| GEH | Groupe d’Exploitation Hydraulique | In French | |
| GEM | Greenstar Energy Management | In English | |
| GEMS | General Energy Management System | In English | |
| Geoth | Geothermics | In English | → Serial publications, periodicals → Earth sciences |
| GFESS | Gaz de France Energy Supply & Solutions | In French | |
| GFSA | Global Forum on Sustainable Energy | In English | |
| GLNR | Gaz Liivré Non Relevé | In French | |
| GNL | Gaz Naturel Liquefié | In French | → Chemical technology |
| GNV | Gaz Naturel Véhicule | In French | → Vehicle engineering |
| GPL | Gaz Pétrole Liquéfié | In French | → Chemical technology |
| GSO | Gaz du Sud-Ouest | In French | |
| GTE | Génie Thermique et Énergie | In French | → Thermodynamics |
| GVS | Gazversorgung Süddeutschland (www.gvs-erdgas.de) | In German | |
| HESC | Hemispheric Energy Steering Committee = CDEH | Comité Directivo para la Energía del Hemisferio | In Spanish = CDEH | Comité Directeur pour l'Énergie dans l'Hémisphère | In French = CDEH | Comitê Diretor para a Energia do Hemisfério | In Portuguese |
In English | → International economic cooperation |
| HFP | Hydrogen and Fuel Cell Platform (www.hfpeurope.org) | In English | → Organizations and associations |
| IAAE | Internacia Agentejo pri Atom-Energio (www.iaea.org) = IAEA | International Atomic Energy Agency | In English = AIEA | Agence Internationale de l'Énergie Atomique | In French = AIEA | Agenţia Internaţională pentru Energie Atomică | In Romanian = МААЕ | Международна агенция за атомна енергия | In Bulgarian = AIEA | Agència Internacional de l'Energia Atòmica | In Catalan = MAAE | Mezinárodní agentura pro atomovou energii | In Czech = IAEA | Det Internationale Atomenergiagentur | In Danish = IAEO | Internationale Atomenergieorganisation | In German = OIEA | Organismo Internacional de Energía Atómica | In Spanish = סבא"א | הסוכנות הבינלאומית לאנרגיה אטומית | In Hebrew = IAEA | International Atomenergie Agence | In Letzeburgesh = AIEA | Agenzia Internazionale per l'Energia Atomica | In Italian = IAEA | अंतर्राष्ट्रीय परमाणु ऊर्जा अधिकरण | In Hindi = MAAE | Меѓународна агенција за атомска енергија | In Macedonian = МАГАТЭ | Международное агентство по атомной энергии | In Russian = AIEA | Agência Internacional de Energia Atómica | In Portuguese = MAEA | Międzynarodowa Agencja Energii Atomowej | In Polish = МАГАТЕ | Міжнародне агентство з атомної енергії | In Ukrainian = UAEA | Uluslararası Atom Enerji Ajansı | In Turkish = IAEA | สำนักงานพลังงานปรมาณูระหว่างประเทศ | In Thai = EANA | Energia Atomikoaren Nazioarteko Agentzia | In Basque |
In Esperanto | → International relations → Nuclear technology |
| IAEA | Det Internationale Atomenergiagentur (www.iaea.org) = IAAE, AIEA, МААЕ, MAAE, IAEO, OIEA, סבא"א, МАГАТЭ, MAEA, МАГАТЕ, UAEA, EANA (look above) |
In Danish | → International relations → Nuclear technology |
| IAEA | International Atomenergie Agence (www.iaea.org) = IAAE, AIEA, МААЕ, MAAE, IAEO, OIEA, סבא"א, МАГАТЭ, MAEA, МАГАТЕ, UAEA, EANA (look above) |
In Letzeburgesh | → International relations → Nuclear technology |
| IAEA | अंतर्राष्ट्रीय परमाणु ऊर्जा अधिकरण (www.iaea.org) = IAAE, AIEA, МААЕ, MAAE, IAEO, OIEA, סבא"א, МАГАТЭ, MAEA, МАГАТЕ, UAEA, EANA (look above) |
In Hindi | → International relations → Nuclear technology |
| IAEA | สำนักงานพลังงานปรมาณูระหว่างประเทศ (www.iaea.org) = IAAE, AIEA, МААЕ, MAAE, IAEO, OIEA, סבא"א, МАГАТЭ, MAEA, МАГАТЕ, UAEA, EANA (look above) |
In Thai | → International relations → Nuclear technology |
| IAEA | International Atomic Energy Agency (www.iaea.org) = IAAE, AIEA, МААЕ, MAAE, IAEO, OIEA, סבא"א, МАГАТЭ, MAEA, МАГАТЕ, UAEA, EANA (look above) |
In English | → International relations → Nuclear technology |
| IAEO | Internationale Atomenergieorganisation (www.iaea.org) = IAAE, IAEA, AIEA, МААЕ, MAAE, OIEA, סבא"א, МАГАТЭ, MAEA, МАГАТЕ, UAEA, EANA (look above) |
In German | → International relations → Nuclear technology |
| ICTAF | Interdisciplinary Center for Technological Analysis & Forecast | In English | |
| IDAE | Instituto para la Diversificación y Ahorro de la Energía | In Spanish | |
| IEA | Internationale Energieagentur = AIE | Agence Internationale de l'Énergie | In French = IEA | International Energy Agency | In English = МЭА | Международное энергетическое агентство | In Russian = MAE | Międzynarodowa Agencja Energii[edytuj] | In Polish = IEA | Internationaal Energie Agentschap | In Dutch = IEA | 国際エネルギー機関 | In Japanese = AIE | Agencia Internacional de la Energía | In Spanish |
In German | → International relations |
| IEA | International Energy Agency = AIE, МЭА, MAE (look above) |
In English | → International relations |
| IEA | Internationaal Energie Agentschap = AIE, МЭА, MAE (look above) |
In Dutch | → International relations |
| IEA | 国際エネルギー機関 = AIE, МЭА, MAE (look above) |
In Japanese | → International relations |
| IED | Innovation Énergie Développement | In French | |
| IEE | Intelligente Energie Europa = IEE | Intelligent Energy Europe | In English |
In German | |
| IEE | Intelligent Energy Europe = (look above) |
In English | |
| IEF | International Energy Foundation | In English | → Foundations |
| IER | Institute of Energy Economics and the Rational Use of Energy | In English | |
| IESD | Institute of Energy and Sustainable Development | In English | |
| IFEU | Institut für Energie und Umweltforschung | In German | |
| IFFI | Institut Français du Froid Industriel et du génie climatique | In French | → Environmental technology, water supply, waste management |
| IGU | International Gas Union | In English | → Organizations and associations |
| IJER | International Journal of Energy Research | In English | → Serial publications, periodicals |
| IJFE | International Journal of Fusion Energy | In English | → Serial publications, periodicals → Nuclear technology |
| IJHE | International Journal of Hydrogen Energy | In English | → Serial publications, periodicals |
| IJSE | International Journal of Solar Energy | In English | → Serial publications, periodicals |
| INCASOL | Institut Català del Sòl | In Spanish | → Astronomy |
| INEGA | Instituto Enerxético de Galicia | In Spanish | |
| IPE-LAS | Institute of Physical Energetics - Latvian Academy of Sciences | In English | → Optics |
| IRE | Institutul Naţional Român pentru Studiul Amenajării şi Folosirii Surselor de Energie | In Romanian | → Organizations and associations |
| ISE | Iniziative Sviluppo Energie | In Italian | |
| ISEO | International Sustainable Energy Organisation | In English | |
| ISES | International Solar Energy Society | In English | |
| ISET | Institut für Solare Energieversorgungstechnik | In German | |
| ISUSI | Institute for Sustainable Solutions and Innovations | In English | |
| ITEnC | IEEE (Institute of Electrical and Electronics Engineers) Transactions on Energy Conversion | In English | → Serial publications, periodicals |
| ITER | Instituto Tecnológico y de Energías Renovables | In Spanish | |
| IWP | Independent Water and Power Production | In English | → Electrical engineering |
| IZES | Institut für ZukunftsEnergieSysteme | In German | |
| JAEA | Japan Atomic Energy Agency (www.jaea.go.jp) | In English | → 53912 → Nuclear technology |
| JAEIC | Joint Atomic Energy Intelligence Committee | In English | → Nuclear technology |
| JEner | Journal of Energy | In English | → Serial publications, periodicals |
| JMES | Journal of Materials and Energy Systems | In English | → Serial publications, periodicals → 620 |
| JPS | Journal of Power Sources | In English | → Serial publications, periodicals |
| KAPE | Krajowa Agencja Poszanowania Energii | In Polish | |
| KEA | Klimaschutz- und Energieagentur | In German | → Meteorology, climatology |
| KliBA | Klimaschutz- und Energie-Beratungsagentur | In German | → Meteorology, climatology |
| KOEF | Korea Energy Forum | In English | |
| KREA | Kaunas Regional Energy Agency | In English | |
| LATERE | Loirénergie, Agence Technique pour une Énergie Respectueuse de l'Environnement | In French | |
| LEI | Lithuanian Energy Institute | In English | |
| LETIT | Local Energy Technology Implementation | In English | |
| LIOS | Linzer Institut für Organische Solarzellen = LIOS | Linz Institute for Organic Solarcells | In English |
In German | → Research institutes |
| LIOS | Linz Institute for Organic Solarcells = (look above) |
In English | → Research institutes |
| M3E | Modélisation pour l'Énergie, l'Économie, l'Énvironnement | In French | → Economics → Environment, environmental sciences |
| MAAE | Mezinárodní agentura pro atomovou energii (www.iaea.org) = IAAE, IAEA, AIEA, МААЕ, IAEO, OIEA, סבא"א, МАГАТЭ, MAEA, МАГАТЕ, UAEA, EANA (look above) |
In Czech | → International relations → Nuclear technology |
| MAAE | Меѓународна агенција за атомска енергија (www.iaea.org) = IAAE, IAEA, AIEA, МААЕ, IAEO, OIEA, סבא"א, МАГАТЭ, MAEA, МАГАТЕ, UAEA, EANA (look above) |
In Macedonian | → International relations → Nuclear technology |
| MAE | Międzynarodowa Agencja Energii[edytuj] = IEA, AIE, МЭА (look above) |
In Polish | → International relations |
| MAEA | Międzynarodowa Agencja Energii Atomowej (www.iaea.org) = IAAE, IAEA, AIEA, МААЕ, MAAE, IAEO, OIEA, סבא"א, МАГАТЭ, МАГАТЕ, UAEA, EANA (look above) |
In Polish | → International relations → Nuclear technology |
| MAES | Malopolska Agencja Energii i Srodowiska | In Polish | |
| MDE | Maîtrise de la Demande d’Énergie | In French | |
| MDE | Maîtrise de la Demande en Électricité | In French | → Electrical engineering |
| MECO | Mekong Energy Company Limited | In English | → Electrical engineering |
| MEEI | Mechanical Engineering Energy Institute | In English | → Mechanical engineering |
| MEEREA | Malta Energy Efficiency & Renewable Energies Association | In English | → Organizations and associations |
| MEMA | Meath Energy Management Agency | In English | |
| MII | Maisons Individuelles Isolées | In French | → Building |
| MSA | Main Bus Solar Array | In English | |
| MUNEE | Municipal Networks for Energy Efficiency | In English | → Public administration, government |
| NAPE | Narodowa Agencja Poszanowania Energii | In Polish | |
| NEDO | New Energy and Industrial Technology Development Organization | In English | → Organizations and associations → Industry, industrial policy |
| NERSA | National Energy Regulator of South Africa (www.ner.org.za) | In English | → Central administration |
| NICE | Nizhny Novgorod Innovation Center for Energy Saving | In English | |
| NIFES | National Industrial Fuel Efficiency Service | In English | → Vehicle engineering |
| NREL | National Renewable Energy Laboratory | In English | → Research institutes |
| NU | Northeast Utilities | In English | |
| NWS | Neckarwerke Stuttgart AG | In German | |
| OGK | Optovaya Giéniérirouyouchtchaya Kompaniya = ОГК | Оптовая генерирующая компания | In Russian |
In Russian | → Electrical engineering |
| OIEA | Organismo Internacional de Energía Atómica (www.iaea.org) = IAAE, IAEA, AIEA, МААЕ, MAAE, IAEO, סבא"א, МАГАТЭ, MAEA, МАГАТЕ, UAEA, EANA (look above) |
In Spanish | → International relations → Nuclear technology |
| PAC | Pile à combustible | In French | → Electrical engineering |
| PAPEETE | Pour Améliorer les Performances Énergétiques ET Environnementales | In French | → Electrical engineering |
| PAZE | Podlaska Agencja Zarzidzania Energii | In Polish | |
| PCM | Photoelectric Cell Module | In English | → Electrical engineering |
| PCS | Power Conversion System | In English | → Electrical engineering |
| PCU | Power Control Unit | In English | |
| PCU | Power Conditioning Unit | In English | |
| PCU | Power Condition Unit | In English | |
| PCU | Power Conversion Unit | In English | |
| PDB | Power Distribution Box | In English | → Electrical engineering |
| PDCS | Power Distribution and Control Subsystem | In English | |
| PDCU | Power Distribution and Control Unit | In English | |
| PDE | Projectbureau Duurzame Energie | In Dutch | |
| PDS | Power Distribution System | In English | |
| PDU | Power Drive Unit | In English | |
| PDUG | Plan de Desserte Urbain Gaz | In French | |
| PE | Primärenergie | In German | |
| PENELOPE | Promoting ENergy Efficiency to Local Organisations through dissemination Partnerships in Europe | In English | |
| PG | Power Generation | In English | → Electrical engineering |
| PGA | Power Generating Assembly | In English | → Electrical engineering |
| PGD&CS | Power Generation, Distribution, and Control Subsystem | In English | → Electrical engineering |
| PGN | Professionnel Gaz Naturel | In French | |
| PGNC | Professionnel Gaz Naturel Confort | In French | |
| PGP | Professionnel Gaz Propane | In French | |
| PGS | Power Generation System | In English | → Electrical engineering |
| PHP | Passiefhuis-Platform | In Dutch | → Building |
| PIU | Power Interface Unit | In English | |
| PL | Power Level | In English | |
| PMAD | Power Management And Distribution | In English | → Electrical engineering |
| PMC | Plutonia-Molybdenum Cermet | In English | → Nuclear technology |
| PMD | Power Management and Distribution | In English | → Electrical engineering |
| PMG | Pôle Marketing Gaz | In French | |
| PMS | Power Management System | In English | → Electrical engineering |
| PP | Power Plant | In English | → Electrical engineering |
| PSCU | Power Supply Control Unit | In English | → Electrical engineering |
| PSD | Power Systems Division | In English | → Electrical engineering |
| PSD | Power Spectral Density | In English | → Electrical engineering |
| PSDU | Power and Signal Distribution Unit | In English | → Electrical engineering → Telecommunications |
| PSG | Power Subsystem Group | In English | → Electrical engineering |
| PSI | Power Static Inverter | In English | |
| PSIU | Power and Signal Interface Unit | In English | → Electrical engineering → Telecommunications |
| PSM | Power Storage Module | In English | |
| PSU | Power Switching Unit | In English | → Electrical engineering |
| PT | Power Transfer | In English | |
| PTO | Power Test Operation | In English | |
| PU | Power Unit | In English | → Electrical engineering |
| PV | Photovoltaic | In English | |
| PVTCS | Photovoltaic Thermal Control System | In English | |
| Qe2 | Quantock Energy & Environment | In English | |
| REACM | Regional Energy Agency of Central Macedonia | In English | |
| REEEP | Renewable Energy and Energy Efficiency Partnership | In English | |
| REGBIE | Regional Bioenergy Initiatives around Europe | In English | |
| REIO | Renewable Energy Information Office | In English | |
| RENAEL | Rete Nazionale Agenzie Energetiche Locali | In Italian | |
| RENAISSANCE | Renewable ENergy Acting in SuStainable And Novel Community Enterprises | In English | |
| RESTART | Renewable Energy Strategies and Technology Applications for Regenerating Towns | In English | |
| REUS | Rational Energy Use & Solutions | In English | |
| RTG | Radioisotope Thermal Generator | In English | → Nuclear technology |
| SADPT | Solar Array Drive and Power Transfer | In English | → Electrical engineering |
| SAS | Solar Array Simulator | In English | |
| SAS | Solar Array System | In English | |
| SCARF | Save Cash and Reduce Fuel | In English | |
| SDIG | Société pour le Développement de l’Industrie du Gaz | In French | |
| SEA | Samsø Energy Agency | In English | |
| SEA | Slovak Energy Agency | In English | |
| SEC | Sigma Energy Consulting | In English | → Consulting |
| SECTM | Société d’Électricité et de Thermique du Centre et du Midi | In French | → Electrical engineering |
| SEE | Service de l'Énergie de l'État | In French | → Central administration |
| SEEA | Serbian Energy Efficiency Agency | In English | |
| SEEC | Scottish Energy and Environment Conference | In English | → Organizations and associations → Nature |
| SEN | Sistemul Electroenergetic Naţional | In Romanian | |
| SEP | Solar Electric Propulsion | In English | → Electrical engineering |
| SEPTEN | Service Études et Projets Thermiques Et Nucléaires | In French | → Nuclear technology |
| SER | Sources d'Énergie Renouvelable | In French | |
| SERC | Solar Energy Research Center | In English | |
| SET | Solar Energy Thermionic | In English | |
| SFEN | Société Française d'Énergie Nucléaire | In French | → Organizations and associations → Nuclear technology |
| SFEN | Société Française pour l’Énergie Nucléaire | In French | → Organizations and associations → Nuclear technology |
| SFMC | Société des Forces Motrices du Châtelot | In French |