| SFOE | Swiss Federal Office of Energy | In English | |
| SHEMA | Société Hydraulique d'Études et de Missions d'Assistance | In French | |
| SIP | Società Idroelettrica Piemontese | In Italian | → Electrical engineering |
| SMES | Superconducting Magnetic Energy Storage | In English | |
| SNET | Société Nationale d’Électricité et de Thermique | In French | → Electrical engineering |
| SoCe | Solar Cells | In English | → Serial publications, periodicals |
| SoEn | Solar Energy | In English | → Serial publications, periodicals |
| SoEnM | Solar Energy Materials | In English | → Serial publications, periodicals |
| SOFC | Solid Oxide Fuel Cell | In French | |
| SOFENA | Sofia Energy Agency | In English | |
| SPCA | Secondary Power Control Assembly | In English | |
| SPDB | Subsystem Power Distribution Box | In English | |
| SPP | Slovenský Plynárenský Priemysel | In Slovak | |
| SpPow | Space Power | In English | → Serial publications, periodicals → Spaceflight engineering, astronautics |
| SPRMD | Space Power Resources and Manufacturing Development | In English | → Serial publications, periodicals → Spaceflight engineering, astronautics |
| SPRU | Standard Power Regulator Unit | In English | |
| SPS | Satellite Power System | In English | → Spaceflight engineering, astronautics |
| SSE | Stredoslovenská energetika (www.sse.sk) | In Slovak | |
| SSPRv | Space and Solar Power Review | In English | → Serial publications, periodicals → Astronomy |
| SSPS | Solar Satellite Power Station | In English | → Spaceflight engineering, astronautics |
| SSRV | Solar-Sail Race Vehicle | In English | → Vehicle engineering |
| STEP | Station de Transfert d’Énergie par Pompage | In French | |
| SWEA | Severn Wye Energy Agency | In English | |
| TAEM | Terminal Area Energy Management | In English | |
| TdE | Transalpina di Energia | In Italian | |
| TEA | Tipperary Energy Agency | In English | |
| TEGI | Tractebel Electricity & Gas International | In English | → Electrical engineering |
| TEMASOL | Total EDF Maroc Solaire | In French | → Electrical engineering |
| TEP | Tonne Équivalent Pétrole | In French | → 665 |
| TESE | Technologies et Économie des Sytèmes Électriques | In French | → Electrical engineering |
| TGV | Turbine - Gaz - Vapeur | In French | |
| ThF | Thermique à Flamme | In French | |
| TMS | Thermal Management Solutions | In English | |
| TREN | TRansport et ÉNergie | In French | → Transport and postal services |
| TrGRC | Geothermal Resources Council Transactions | In English | → Serial publications, periodicals → Earth sciences |
| UAEA | Uluslararası Atom Enerji Ajansı (www.iaea.org) = IAAE | Internacia Agentejo pri Atom-Energio | In Esperanto = 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 = IAEA | สำนักงานพลังงานปรมาณูระหว่างประเทศ | In Thai = EANA | Energia Atomikoaren Nazioarteko Agentzia | In Basque |
In Turkish | → International relations → Nuclear technology |
| UEA | United Energy Associates | In English | → Electrical engineering → Environmental technology, water supply, waste management |
| UES | Unified Energy System = ЕЭС | Единые Энергетические Системы | In Russian |
In English | → Electrical engineering |
| UKAEA | United Kingdom Atomic Energy Agency | In English | → Public administration, government → Nuclear technology |
| UTE | Usina Termelétrica Norte Fluminense (www.utenortefluminense.com.br) | In Portuguese | → Electrical engineering |
| VEAG | Vereinigte Energiewerke AG | In German | |
| VGR | Vente de Gaz Réparti | In French | |
| VOGUE | Vers l’Optimisation de la Gestion et de l’Utilisation de l’Énergie | In French | → Electrical engineering |
| VPD | Variable Power Divider | In English | → Electrical engineering |
| VPP | Virtual Power Plant | In English | → Electrical engineering |
| VTC | Vlaamse Thermie Coordinate | In Dutch | → Organizations and associations |
| WEC | World Energy Council = CME | Conseil Mondial de l'Énergie | In French = CME | Consiliul Mondial al Energiei | In Romanian |
In English | → Organizations and associations → International relations |
| WEMAL | Wexford Energy Management Agency | In English | |
| WiEn | Wind Energy | In English | → Serial publications, periodicals → 621548 |
| WiEng | Wind Engineering | In English | → Serial publications, periodicals → 621548 |
| WISE | World Information Service on Energy | In English | |
| WREAN | Western Regional Energy Agency & Network | In English | |
| WREN | World Renewable Energy Network | In English | |
| WSED | World Sustainable Energy Days | In English | |
| WTREA | Watford and Three Rivers Energy Agency | In English | |
| ZECK | Zespół Elektrociepłowni Wrocławskich "Kogeneracja" (www.kogeneracja.com.pl) | In Polish | → Electrical engineering |
| ZeIE | Zeitschrift elektrische Informations- und Energietechnik | In German | → Serial publications, periodicals → Electrical engineering |
| ZEP | Zero Emission Fossil Fuel Power Plants (www.zero-emissionplatform.eu) | In English | → Nature and society |
| ZREU | Zentrum für rationelle Energieanwendung und Umwelt | In German | |
| ЕЭС | Единые Энергетические Системы = UES (look above) |
In Russian | → Electrical engineering |
| МААЕ | Международна агенция за атомна енергия (www.iaea.org) = UAEA, IAAE, IAEA, AIEA, MAAE, IAEO, OIEA, סבא"א, МАГАТЭ, MAEA, МАГАТЕ, EANA (look above) |
In Bulgarian | → International relations → Nuclear technology |
| МАГАТЕ | Міжнародне агентство з атомної енергії (www.iaea.org) = UAEA, IAAE, IAEA, AIEA, МААЕ, MAAE, IAEO, OIEA, סבא"א, МАГАТЭ, MAEA, EANA (look above) |
In Ukrainian | → International relations → Nuclear technology |
| МАГАТЭ | Международное агентство по атомной энергии (www.iaea.org) = UAEA, IAAE, IAEA, AIEA, МААЕ, MAAE, IAEO, OIEA, סבא"א, MAEA, МАГАТЕ, EANA (look above) |
In Russian | → International relations → Nuclear technology |
| МЭА | Международное энергетическое агентство = AIE | Agence Internationale de l'Énergie | In French = IEA | International Energy Agency | In English = IEA | Internationale Energieagentur | In German = 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 Russian | → International relations |
| ОГК | Оптовая генерирующая компания = OGK | Optovaya Giéniérirouyouchtchaya Kompaniya | In Russian |
In Russian | → Electrical engineering |
| ОГК-1 | Оптовая генерирующая компания № 1 (www.ogk1.com) | In Russian | → Electrical engineering |
| ОГК-2 | Оптовая генерирующая компания № 2 (www.ogk2.ru) | In Russian | → Electrical engineering |
| ОГК-3 | Оптовая генерирующая компания № 3 (www.ogk3.ru) | In Russian | → Electrical engineering |
| ОГК-4 | Оптовая генерирующая компания № 4 (www.ogk-4.ru) | In Russian | → Electrical engineering |
| ОГК-5 | Оптовая генерирующая компания № 5 (www.ogk-5.com) | In Russian | → Electrical engineering |
| ФЕЕ | Фонд Енергийна Ефективност = BgEEF | Bulgarische Energieeffizienzfonds | In German = BgEEF | Bulgarian Energy Efficiency Fund | In English |
In Bulgarian | |
| סבא"א | הסוכנות הבינלאומית לאנרגיה אטומית (www.iaea.org) = UAEA, IAAE, IAEA, AIEA, МААЕ, MAAE, IAEO, OIEA, סבא"א, МАГАТЭ, MAEA, МАГАТЕ, EANA (look above) |
In Hebrew | → International relations → Nuclear technology |