| AAE | Agencia Andaluza de la Energía | In Spanish | |
| ABC | Austrian Bioenergy Centre | In English | |
| ABCE | Associação Brasileira das Concessionárias de Energia Elétrica | In Portuguese | → Associations → Electrical engineering |
| ABEA | Association of Bulgarian Energy Agencies | In English | → Organizations and associations |
| ABMEE | Agency of Brasov for the Management of Energy and Environment | In English | → Environment, environmental sciences |
| ABRADEE | Associação Brasileira dos Distribuidores de Energia Elétrica | In Portuguese | → Associations → Electrical engineering |
| ACE | Association for the Conservation of Energy | In English | |
| ACE | Asean Centre for Energy | In English | |
| ADEME | Agence de l'Environnement et de la Maîtrise de l'Énergie | In French | → Organizations and associations → Nature and society → Environmental technology, water supply, waste management |
| ADENE | Agência para a Energia | In Portuguese | |
| AEA | Agenzia per l'Energia e l'Ambiente (della Provincia di Perugia) | In Italian | → Nature |
| AEAEE | Asociación de Empresas para el Ahorro de la Energía en la Edificación | In Spanish | → Associations |
| AEC | Atomic Energy Commission | In English | → Nuclear technology |
| AEE | Arbeitsgemeinschaft Erneuerbare Energie | In German | → Associations |
| AEE | Agence pour les Économies d'Énergie | In French | |
| AEE | Association of Energy Engineers | In English | → Organizations and associations |
| AEL | Agence de l'Énergie du Luxembourg | In French | |
| AEMPA | Agencia Energética Municipal de Pamplona | In Spanish | |
| AER | Atomic Energy Research | In English | → Nuclear technology |
| AESS | Agenzia per l'Energia e lo Sviluppo Sostenibile (di Modena) | In Italian | → Nature |
| AFC | Alkaline Fuel Cell | In English | → Vehicle engineering → Chemical technology |
| AFG | Association Française du Gaz | In French | → Associations |
| AFM+E | Außenhandelsverband für Mineralöl und Energie | In German | → Organizations and associations → Trade → 665 |
| AFM+E | Außenhandelsverband für Minerall und Energie | In German | → Organizations and associations → Trade → Mining |
| AFME | Agence Française pour la Maîtrise de l'Énergie | In French | |
| AGE | Accès au Gaz Entreprises | In French | |
| AGENA | Agenzia per l'Energia e l'Ambiente (della Provincia di Teramo) | In Italian | → Nature |
| AGENEAL | Agência Municipal de Energia de Almada | In Portuguese | |
| AGENEX | Agencia Extremeña de la Energía Badajoz | In Spanish | |
| AGGPP | Accès au Gaz Particuliers et Professionnels | In French | |
| AIE | Agencia Internacional de la Energía = AIE | Agence Internationale de l'Énergie | In French = IEA | International Energy Agency | In English = IEA | Internationale Energieagentur | In German = 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 |
In Spanish | → International relations |
| AIE | Agence Internationale de l'Énergie = IEA, МЭА, MAE (look above) |
In French | → International relations |
| AIEA | Agence Internationale de l'Énergie Atomique (www.iaea.org) = IAAE | Internacia Agentejo pri Atom-Energio | In Esperanto = IAEA | International Atomic Energy Agency | In English = 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 French | → International relations → Nuclear technology |
| AIEA | Agência Internacional de Energia Atómica (www.iaea.org) = IAAE, IAEA, МААЕ, MAAE, IAEO, OIEA, סבא"א, МАГАТЭ, MAEA, МАГАТЕ, UAEA, EANA (look above) |
In Portuguese | → International relations → Nuclear technology |
| AIEA | Agenzia Internazionale per l'Energia Atomica (www.iaea.org) = IAAE, IAEA, МААЕ, MAAE, IAEO, OIEA, סבא"א, МАГАТЭ, MAEA, МАГАТЕ, UAEA, EANA (look above) |
In Italian | → International relations → Nuclear technology |
| AIEA | Agència Internacional de l'Energia Atòmica (www.iaea.org) = IAAE, IAEA, МААЕ, MAAE, IAEO, OIEA, סבא"א, МАГАТЭ, MAEA, МАГАТЕ, UAEA, EANA (look above) |
In Catalan | → International relations → Nuclear technology |
| AIEA | Agenţia Internaţională pentru Energie Atomică (www.iaea.org) = IAAE, IAEA, МААЕ, MAAE, IAEO, OIEA, סבא"א, МАГАТЭ, MAEA, МАГАТЕ, UAEA, EANA (look above) |
In Romanian | → International relations → Nuclear technology |
| AIEL | Associazione Italiana Energia dal Legno | In Italian | → Associations → Nature → Agricultural sciences |
| AIET | Agencia Insular de Energía de Tenerife | In Spanish | |
| AIG | Agence Industrie Gaz | In French | |
| ALECOB | Agence Locale de l'Énergie du Centre-Ouest Bretagne | In French | |
| AMEL | Agencia Municipal de Energia de Loures | In Portuguese | |
| AMIG | Agence Maintenance Inter-centre Gaz | In French | |
| AMPERE | Assistance pour la Maîtrise des Procédés par l’Emploi Rationnel des Énergies | In French | → Engineering, technology |
| ANEMONE | Analyse Environnementale et MOdélisation Numérique de l’Éolien | In French | → Environmental technology, water supply, waste management |
| ANRE | Agenţia Naţională de Reglementare în Domeniul Energiei | In Romanian | → Central administration" |
| AnRE | Annual Review of Energy | In English | → Serial publications, periodicals |
| APCC | American Power Conversion Corporation | In English | → Electrical engineering |
| APCP | Aerojet Photoelectric Cell Program | In English | → Aeronautics, aircraft |
| APE | Agencja Poszanowania Energii | In Polish | |
| APEA | Agenzia Provinciale Energia ed Ambiente | In Italian | → Nature |
| APEA | Agencia Provincial de la Energía de Avila | In Spanish | |
| APEH | Agencia Provincial de la Energía de Huelva | In Spanish | |
| ApEn | Applied Energy | In English | → Serial publications, periodicals |
| APERC | Asia Pacific Energy Research Centre | In English | |
| APEVV | Agenzia Provinciale per l'Energia del Vercellese e della Valsesia | In Italian | |
| APU | Auxiliary Power Unit | In English | |
| ARAEN | Agenzia Regionale per l'Energia della Regione Abruzzo | In Italian | |
| ARAGOB | Unidad de Arquitectura Bioclimatica - Gobierno de Aragón | In Spanish | → Building → Architecture |
| ARE | Agenzia per il Risparmio Energetico di Ancona | In Italian | |
| ARE | Agenzia Regionale per l'Energia di Liguria | In Italian | |
| AREAC | Agência Regional de Energia e Ambiente do Centro | In Portuguese | |
| AREAL | Agência Regional de Energia e Ambiente do Algarve | In Portuguese | |
| ARENA | Agência Regional da Energia da Regio Autonoma dos Acores | In Portuguese | |
| ARER | Agence Régionale de l'Énergie de la Réunion | In French | |
| ARGEM | Agencia de Gestión de Energía de la Región de Murcia | In Spanish | |
| ARTG | Agence Résidentiel Tertiaire Gaz | In French | |
| ASET | Agència de Serveis Energètics de Terrassa | In Spanish | |
| ASEW | Arbeitsgemeinschaft für sparsame Energie- und Wasserverwendung im VKU | In German | → Associations → Environmental technology, water supply, waste management |
| ATEL | Aar et Tessin SA d'Électricité | In French | → Organizations and associations → Electrical engineering |
| ATEnEE | Actions Territoriales pour l'Environnement et l'Efficacité Énergétique | In French | → Nature |
| AtERv | Atomic Energy Review | In English | → Serial publications, periodicals → Nuclear, atomic, and molecular physics → Mechanical engineering |
| ATG | Association Technique du Gaz | In French | → Associations |
| ATJSE | ASME (American Society of Mechanical Engineers) Transactions Journal of Solar Energy and Engineering | In English | → Serial publications, periodicals |
| ATS | Accès des Tiers aux Stockages | In French | |
| BAPE | Baltycka Agencja Poszanowania Energii | In Polish | |
| BEA | Bremerhavener Energiemanagement-Agentur | In German | |
| BEDZED | Beddington Zero (fossil) Energy Development | In English | |
| BEF | Baltic Energy Forum | In English | |
| BEM | Building & Energy Management | In English | → Building |
| BERt | Budapesti Erőmű Rt | In Hungarian | |
| BgEEF | Bulgarian Energy Efficiency Fund (www.bgeef.com) = BgEEF | Bulgarische Energieeffizienzfonds | In German = ФЕЕ | Фонд Енергийна Ефективност | In Bulgarian |
In English | |
| BgEEF | Bulgarische Energieeffizienzfonds (www.bgeef.com) = ФЕЕ (look above) |
In German | |
| BNG | British Nuclear Group | In English | → Nuclear technology |
| BoRAEM | Bourgas Regional Agency for Energy Management | In English | |
| BrWK | Brennstoff-Wärme-Kraft | In German | |
| BSRAEM | Black Sea Regional Agency for Energy Management | In English | |
| BSREC | Black Sea Regional Energy Centre | In English | |
| CAE | Centre for Alternative Energy | In English | |
| CAJV | Clough-AMEC Joint Venture | In English | |
| CCUJ | Center for Coal Utilization | In English | |
| CDEH | Comité Directivo para la Energía del Hemisferio = HESC | Hemispheric Energy Steering Committee | In English = CDEH | Comité Directeur pour l'Énergie dans l'Hémisphère | In French = CDEH | Comitê Diretor para a Energia do Hemisfério | In Portuguese |
In Spanish | → International economic cooperation |
| CDEH | Comité Directeur pour l'Énergie dans l'Hémisphère = HESC (look above) |
In French | → International economic cooperation |
| CDEH | Comitê Diretor para a Energia do Hemisfério = HESC (look above) |
In Portuguese | → International economic cooperation |
| CEA | Commissariat à l'Énergie Atomique | In French | → Research institutes → Nuclear, atomic, and molecular physics → Engineering, technology |
| CEA | Commissariat à l’Énergie Atomique | In French | → Organizations and associations → 5931 → 6210 |
| CEEETA | Centro de Estudos em Economia da Energia, dos Transportes e do Ambiente | In Portuguese | → Research institutes → Nature → Applied sciences, technology |
| CeGIBAT | Centre d’information de Gaz de France pour l’Industrie et le Bâtiment | In French | → Industry, industrial policy → Building |
| CENEf | Center for Energy Efficiency | In English | |
| CENG | Centre d'Études Nucléaires de Grenoble | In French | → Nuclear, atomic, and molecular physics → Nuclear technology |
| CEP | Centre Énergétique et Procédés | In French | |
| CEREN | Centre d'Études et de Recherche sur les Énergies | In French | |
| CES | Company for Energy Saving | In English | |
| CFM | Compagnie Française du Méthane | In French | |
| CHARTH | Compagnie Holding d'Applications et de Réalisations Thermiques et Hydrauliques | In French | → Organizations and associations → Mechanical engineering |
| CIC | Chauffage Individuel Centralisé | In French | |
| CIE | Cyprus Institute of Energy | In English | |
| CIME | Centre Inter-régional des Mouvements d’Énergie | In French | |
| CIT | Centre d'Ingénierie Thermique | In French | |
| CLE | Compteur Libre Énergie | In French | → Electrical engineering |
| CLER | Comité de Liaison Énergies Renouvelables | In French | |
| CME | Congrès Mondial de l’Énergie | In French | → Congresses |
| CME | Consiliul Mondial al Energiei = CME | Conseil Mondial de l'Énergie | In French = WEC | World Energy Council | In English |
In Romanian | → Organizations and associations → International relations |
| CME | Conseil Mondial de l'Énergie = WEC (look above) |
In French | → Organizations and associations → International relations |
| CNEH | Centre National d’Équipement Hydraulique | In French | |
| CNEN | Centre National d’Équipement Nucléaire | In French | → Nuclear technology |
| CNET | Centre National d’Équipement Thermique | In French | |
| CNR-CME | Comitetul Naţional Român al Consiliului Mondial al Energiei | In Romanian | → Public administration, government |
| CODEMA | City of Dublin Energy Management Agency | In English | |
| COGAC | COmpagnie Gazière d’Approvisionnement Charbonnier | In French | → Mining → Chemical technology |
| COGETHERM | COmpagnie française pour la coGÉnération THERMique | In French | → Electrical engineering |
| COMEGO | Compañía Mexicana de Gerencia y Operación | In Spanish | → Electrical engineering |
| COMES | Commissariat à l'Énergie Solaire | In French | |
| CPEE | Cleaner Production and Energy Efficiency Centre | In English | |
| CRAM | Centre Régional d'Analyse des Matériaux | In French | |
| CRES | Center for Renewable Energy Sources | In English | |
| CREST | Centre for Renewable Energy Systems Technology | In English | |
| CREST | Centre for Renewable Energy System Technology | In English | |
| CSE | Centre for Sustainable Energy | In English | → Nature and society |
| CSEG | Conseil Supérieur de l’Électricité et du Gaz | In French | → Electrical engineering |
| CSEP | Cornwall Sustainable Energy Partnership | In English | |
| CTG | Conseil Technique Gaz | In French | |
| DEAT | Donegal Energy Action Team | In English | |
| DECL | Direct Energy Conversion Laboratory | In English | → Research institutes |
| DÉMÁSZ | Dél-magyarországi Áramszolgáltató Részvénytársaság | In Hungarian | → Electrical engineering |
| DENA | Deutsche Energie-Agentur | In German | |
| DET | Direct Energy Transfer | In English | |
| DGEMP | Direction Générale de l'Énergie et des Matières Premières | In French | → Central administration |
| DGS | Deutsche Gesellschaft für Sonnenenergie | In German | → Organizations and associations |
| DIDEME | Direction de la Demande et des Marchés Énergétiques | In French | |
| DIGEC | Direction de l’Industrie, du Gaz, de l’Électricité et du Charbon | In French | → Central administration → Electrical engineering → Mining |
| DIPS | Dynamic Isotope Power System | In English | |
| DOE | Department of Energy | In English | → Central administration |
| DoLAEM | Dobrich Local Agency for Energy Management | In English | |
| DOWNVInD | Distant Offshore Wind farms with No Visual Impact in Deepwater | In English | |
| DPTH | Division Productions Thermiques et Hydrauliques | In French | → Electrical engineering |
| DTC | Division Téléconduite des Réseaux | In French | → Electrical engineering |
| DVGW | Deutsche Vereinigung des Gas- und Wasserfaches (www.dvgw.de) | In German | → Organizations and associations → Environmental technology, water supply, waste management |
| E2A | EnergieEffizienzAgentur Rhein-Neckar-Dreick | In German | |
| EANA | Energia Atomikoaren Nazioarteko Agentzia (www.iaea.org) = AIEA, IAAE, IAEA, МААЕ, MAAE, IAEO, OIEA, סבא"א, МАГАТЭ, MAEA, МАГАТЕ, UAEA (look above) |
In Basque | → International relations → Nuclear technology |
| EAS | Energy Action Scotland | In English | |
| EAZ | Energie Agentschap Zoetermeer | In Dutch | |
| EBA | Estonian Biomass Association | In English | |
| ECB | Energy Centre Bratislava | In English | |
| ECD | Energy Citations Database | In English | → Bibliography |
| ECM | Energy Conversion Management | In English | → Serial publications, periodicals |
| ECN | Energieonderzoek Centrum Nederland | In Dutch | |
| ECN | Energy Research Centre of the Netherlands | In English | |
| ECSC | Energy Conservation and Solar Centre | In English | |
| EDF | Électricité de France (www.edf.fr) | In French | → Electrical engineering |
| EDM | Énergie du Mali | In French | → Electrical engineering |
| EDP | Energias de Portugal | In Portuguese | → Electrical engineering |
| EDROME | Exploration et exploitation Durable des Ressources Océaniques Minérales et Énergétiques | In French | → Mining |
| EEA | Energy Efficiency Agency | In English | |
| EEG | Erneuerbare-Energien-Gesetz | In German | → Politics |
| EEG | Erdöl Erdgas Gommern GmbH | In German | → Chemical technology |
| EEG | Energy Economics Group | In English | → Organizations and associations |
| EEQ | Erneuerbare Energiequelle | In German | |
| eERG | End-use Efficiency Research Group | In English | → Mechanical engineering |
| EERI | Estonian Energy Research Institute | In English | |
| EET | Erneuerbare Energieträger | In German | |
| EFC | European Fuel Cell | In English | → Vehicle engineering |
| EFESE | Économie, Fonctionnement et Études des Systèmes Énergétiques | In French | → Electrical engineering |
| EFG | Energieforschungsgemeinschaft | In German | |
| EFOG | Elgin Franklin Oil & Gas Ltd | In English | → Chemical technology |
| EGEC | European Geothermal Energy Council | In English | |
| EI | Energi Industrien | In German | → Industry, industrial policy |
| EIfER | European Institute for Energy Research (www.eifer.uni-karlsruhe.de) | In English | → Research institutes → Electrical engineering |
| EIHP | Energy Institute Hrvoje Pozar | In English | |
| EIV | Energieinstitut Vorarlberg | In German | |
| ElWG | Elektrizitätswesengesetz | In German | → Electrical engineering |
| EM&P | Energétique, Matériaux & Procédés | In French | → 620 |
| EMCEF | European Mine Chemical and Energy Workers Federation | In English | → Organizations and associations → Labour, labour economics → Mining |
| EMPS | Electric Machines and Power Systems | In English | → Serial publications, periodicals → Electrical engineering |
| EnAt | Energia és Atomtechnika | In Hungarian | → Serial publications, periodicals → Nuclear technology |
| EnBW | Energie Baden-Württemberg AG (www.enbw.com) | In German | → Electrical engineering |
| EnBW | Energie Baden-Würtemberg | In German | |
| EnC | Energy Conversion | In English | → Serial publications, periodicals |
| ENECO | ENergie En COmmunicatie | In Dutch | |
| ENERBAT | ÉNERgie dans les BÂtiments et les Territoires | In French | → Electrical engineering → Building |
| ENERTHY | Énergies Nouvelles et Renouvelables, Thermique, HYdraulique | In French | → Electrical engineering |
| ENR | Énergie renouvelable | In French | |
| EnS | Energy Sources | In English | → Serial publications, periodicals |
| ENSO | Energie Sachsen Ost GmbH (www.enso.de) | In German | |
| EnTR | Energy Technology Review | In English | → Serial publications, periodicals |
| EPA | EnergiePrestatieAdvies | In Dutch | |
| EPE | Étude de Planification Énergétique | In French | |
| EPIA | European Photovoltaic Industry Association | In English | → Associations → Electrical engineering |
| EPSMA | European Power Supply Manufacturers Association | In English | → Organizations and associations → Electrical engineering |
| EPTA | European Power Tool Association | In English | → Organizations and associations |