| Ammonit Measurement GmbH | Berlin, Germany | · |
| Ammonit Wind Tunnel GmbH | Admannshagen-Bargeshagen, Germany | Visit site |
| Ammper | Mexico City, Mexico | Visit site |
| AmoSolar | Hefei Shi, China | Visit site |
| Amokabel | Alstermo, Sweden | Visit site |
| Amoovo Energy | Bé, Cameroon | Visit site |
| Amp Nova | Shenzhen Shi, China | Visit site |
| Amp X | London, United Kingdom | Visit site |
| Ampace Technology Limited | Xiamen Shi, China | · |
| Ampacimon | Khenchela, Algeria | Visit site |
| Ampd Energy | Singapore, Singapore | · |
| Ampeak Energy | Edinburgh, United Kingdom | Visit site |
| Ampeers Energy | München, Germany | · |
| Ampere Energy | El Puig de Santa Maria, Spain | Visit site |
| AmpereHour Energy | Pune, India | · |
| Amperecloud | Rosa, Germany | Visit site |
| Amperesand | Singapore, Singapore | Visit site |
| Amperex Technology | China | Visit site |
| Ampersand Energy | Kigali, Rwanda | Visit site |
| Amplus Solar | Sohna, India | · |
| Ampowr | De Meern, Netherlands | · |
| Ampton Energy | Vellore, India | Visit site |
| Ampton Energy | Chennai, India | Visit site |
| Ampx Technologies | Jamnagar, India | Visit site |
| Ampyx Power | Den Haag, Netherlands | Visit site |
| Amrut Energy | Ahmedabad, India | · |
| Amrut Solar | Melbourne, Australia | Visit site |
| Anaergia | Burlington, Canada | Visit site |
| Ananya Solar Enterprises | Karanja, India | Visit site |
| Anatolia Wind | Bayraklı, Türkiye | Visit site |
| AndSolar | 嘉義市, Taiwan | Visit site |
| Andersen in Spain | Pinto, Spain | Visit site |
| Andes Energy | Bogotá, Colombia | Visit site |
| Andes Energy | Tocancipá, Colombia | Visit site |
| Andes Solar | Huechuraba, Chile | Visit site |
| Andrade Gutierrez S.A. | São Paulo, Brazil | Visit site |
| Aneo | Trondheim, Norway | Visit site |
| Anern Energy | Guangzhou Shi, China | Visit site |
| Anesco Ltd | Reading, United Kingdom | · |
| Anglesey Solar and Electrical Ltd | Llangefni, United Kingdom | Visit site |
| Anglia Solar | London, United Kingdom | Visit site |
| Anhui F&J New Energy Co., Ltd. | Nanjing Shi, China | Visit site |
| Ankara Solar | Altındağ, Türkiye | Visit site |
| Anker Innovations ANZ | Melbourne, Australia | Visit site |
| Anklous Batteries | Dongwan Shi, China | Visit site |
| Anma Offshore Wind | Seoul, South Korea | · |
| Ansa | Paris, France | Visit site |
| Anson Electric Technology | Shanghai, China | · |
| Antaco | Guildford, United Kingdom | · |
| Antares Electrolysis S.r.l. | Genova, Italy | Visit site |
| Anthesis APAC | Melbourne, Australia | Visit site |
| Anthesis Esp | Manlleu, Spain | Visit site |
| Anthesis Group | London, United Kingdom | Visit site |
| Anu Structurals | Hyderabad, India | Visit site |
| Anubal Renewable Energies Private Limited | Mumbai, India | Visit site |
| Anumar GmbH | Ingolstadt, Germany | Visit site |
| Anygap | Shenzhen Shi, China | Visit site |
| Aohai Digital Power | Dongwan Shi, China | Visit site |
| Aokly Group | Guangzhou Shi, China | · |
| Aori Engenharia e Projetos | Guanambi, Brazil | Visit site |
| Aorima | Saint-Martin-de-Londres, France | Visit site |
| Aotai Electric | Jinan Shi, China | Visit site |
| Apatura | York, United Kingdom | Visit site |
| Aplus Engenharia | Blumenau, Brazil | Visit site |
| Apollo Green Energy Limited | Gurugram, India | Visit site |
| Apolo Energia | São João Baptista, Portugal | Visit site |
| Applied Materials – Picosun | Espoo, Finland | Visit site |
| Applied Materials – Picosun | Finland | Visit site |
| Applied Materials – Picosun | Germany | Visit site |
| Applied Materials – Picosun | United States | Visit site |
| Applied Materials – Picosun | Singapore, Singapore | Visit site |
| Applied Materials – Picosun | Japan | Visit site |
| Applied Materials – Picosun | South Korea | Visit site |
| Applied Materials – Picosun | China | Visit site |
| Applied Materials – Picosun | Taiwan | Visit site |
| Applied Materials – Picosun | India | Visit site |
| Applied Materials – Picosun | France | Visit site |
| Applus+ | Madrid, Spain | Visit site |
| Apricum – The Cleantech Advisory | Berlin, Germany | Visit site |
| Aptech Africa | Kampala, Uganda | Visit site |
| AqGas Group Limited | Nottingham, United Kingdom | Visit site |
| Aquaelecs | Konyaaltı, Türkiye | Visit site |
| Aquaelecs | Antalya, Türkiye | Visit site |
| Aquatera Ltd | Stromness, United Kingdom | Visit site |
| Aquila Capital | Hamburg, Germany | Visit site |
| Aquila Clean Energy APAC | Singapore, Singapore | Visit site |
| Aquila Clean Energy EMEA | Hamburg, Germany | Visit site |
| Arab Consulting Office (ACO) | Sharjah, United Arab Emirates | Visit site |
| Arabelle Solutions | Nanterre, France | Visit site |
| Araoz & Rueda | Madrid, Spain | Visit site |
| Aras Elektrik Dağıtım A.Ş. | Dundurn, Canada | Visit site |
| Arausol - Arau Technik GmbH | Schorndorf, Germany | Visit site |
| Arboga kommun | Arboga, Sweden | Visit site |
| Arbon Cleantech | Coimbatore, India | Visit site |
| Arca | Vancouver, Canada | Visit site |
| Arcadis | Amsterdam, Netherlands | Visit site |
| Archer Wind | Stavanger, Norway | Visit site |
| Archer Wind | Bergen, Norway | Visit site |
| Archer Wind | Oslo, Norway | Visit site |
| Arcon | Barranqueras, Argentina | · |
| Arconi Solutions | Madrid, Spain | Visit site |
| Arde Enerji | Yenimahalle, Türkiye | Visit site |
| Ardian | Paris, France | Visit site |
| Aren Electric Power S.p.a. | Cesena, Italy | Visit site |
| Arenko | London, United Kingdom | · |
| Argeo | Hvalstad, Norway | Visit site |
| Argo Solar Private Limited | Hyderabad, India | Visit site |
| Argus Media | London, United Kingdom | Visit site |
| Arigo Consulting | Melbourne, Australia | · |
| Arin Power | London, United Kingdom | Visit site |
| Arina Energy | Dubai, United Arab Emirates | Visit site |
| Arina Energy | بيروت, Lebanon | Visit site |
| Arina Energy | Qazvin, Iran | Visit site |
| Aris Energy Solutions | Pretoria, South Africa | Visit site |
| Arise AB | Halmstad, Sweden | Visit site |
| Ariston Group | Fabriano, Italy | Visit site |
| Ariya Finergy | Nairobi, Kenya | Visit site |
| Ark Energy Corporation | Brisbane, Australia | Visit site |
| Arka BRENStech Pvt Ltd | Gurugram, India | Visit site |
| Arkolia | Mauguio, France | Visit site |
| Arkyne Technologies | Viladecans, Spain | Visit site |
| Arol Energy | Le Bourget-du-Lac, France | Visit site |
| Aros Solceller | Västerås, Sweden | Visit site |
| Aros electronics AB | Mölndal, Sweden | Visit site |
| Aros electronics AB | Sweden | Visit site |
| Arowya - Green energy services | Milano, Italy | Visit site |
| Arowya AS | Oslo, Norway | Visit site |
| Array (BR) | São Paulo, Brazil | · |
| Array (ES) | Pamplona, Spain | Visit site |
| Arriba Technologies | Cambridge, United Kingdom | Visit site |
| Arteche | Mungia, Spain | Visit site |
| Artelia Canada | Montréal, Canada | · |
| Artes Group | Kruibeke, Belgium | Visit site |
| Arthur D. Little | Brussels, Belgium | Visit site |
| Artıbel Belgelendirme Teknik Kontrol Gözetim ve Eğitim Hiz. Ltd. Şti. | Etimesgut, Türkiye | Visit site |
| Artıbel Belgelendirme Teknik Kontrol Gözetim ve Eğitim Hiz. Ltd. Şti. | Yenimahalle, Türkiye | Visit site |
| Artıbir Enerji | Şişli, Türkiye | Visit site |
| As Koç Enerji | Çankaya, Türkiye | Visit site |
| Asanmek Mühendislik Belgelendirme | Bayraklı, Türkiye | Visit site |
| Asantys Systems GmbH | Hofstetten, Germany | Visit site |
| Asepa Energy | Monteiasi, Italy | Visit site |
| Ashdam Solar Company Limited | Nigeria | Visit site |
| Ashtrom Renewable Energy | Ramat Gan, Israel | Visit site |
| Ashview Consultants | Dublin, Ireland | Visit site |
| Asili Energytech | Stouffville, Canada | Visit site |
| Aspect Ecology Ltd. | Oxford, United Kingdom | Visit site |
| Aspiravi | Harelbeke, Belgium | Visit site |
| Aspire Consulting | Niagara Falls, Canada | Visit site |
| Assan Elektronik | Ümraniye, Türkiye | Visit site |
| Asso.subsea | Kifissia, Greece | Visit site |