| Arausol - Arau Technik GmbH | Schorndorf, Germany | Visit site |
| Arboga kommun | Arboga, Sweden | Visit site |
| Arca | Vancouver, Canada | Visit site |
| Arcadis | Amsterdam, Netherlands | Visit site |
| Archer Wind | Bergen, Norway | Visit site |
| Arconi Solutions | Madrid, Spain | Visit site |
| Ardian | Paris, France | Visit site |
| Argeo | Hvalstad, Norway | Visit site |
| Argus Media | London, United Kingdom | Visit site |
| Arin Power | London, United Kingdom | Visit site |
| Arina Energy | Dubai, Iran | Visit site |
| Ariston Group | Fabriano, Italy | Visit site |
| Ariya Finergy | Nairobi, Kenya | Visit site |
| Arka BRENStech Pvt Ltd | Gurugram, India | Visit site |
| Arkyne Technologies | Viladecans, Spain | Visit site |
| Arol Energy | Le Bourget-du-Lac, France | Visit site |
| Aros electronics AB | Sweden | Visit site |
| Arowya - Green energy services | Milano, Italy | Visit site |
| Arowya AS | Oslo, Norway | Visit site |
| Array (ES) | Pamplona, Spain | Visit site |
| Arriba Technologies | Cambridge, United Kingdom | Visit site |
| Arteche | Mungia, Spain | Visit site |
| 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 |
| 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 |
| Aspect Ecology Ltd. | Oxford, United Kingdom | Visit site |
| Aspire Consulting | Niagara Falls, Canada | Visit site |
| Assan Elektronik | Ümraniye, Türkiye | Visit site |
| Asso.subsea | Kifissia, Greece | Visit site |
| Association of Consulting Engineering Companies BC (ACEC-BC) | Vancouver, Canada | Visit site |
| Association on Energy Efficiency and Energy Saving in Ukraine | Kyiv, Ukraine | Visit site |
| Associazione Italiana Riscaldamento Urbano - AIRU | Milano, Italy | Visit site |
| Astera Solar | Klepp Stasjon, Norway | Visit site |
| Asterion Energies | Madrid, Spain | Visit site |
| Astra Green Solutions | Australia | Visit site |
| Astral Systems | Bristol, United Kingdom | Visit site |
| Atalay Grup Enerji A.Ş. | Çankaya, Türkiye | Visit site |
| Atama Solar Energy BV | Elst, Belgium | Visit site |
| Athon | São Paulo, Brazil | Visit site |
| Atlantic Green | London, United Kingdom | Visit site |
| Atlantis Geoservices Ltd | Norwich, United Kingdom | Visit site |
| Atlantium Technologies | Indonesia | Visit site |
| Atmos Consulting Ltd | Dingwall, United Kingdom | Visit site |
| Atom bv | Melle, Belgium | Visit site |
| Attexo Group | Brisbane, Australia | Visit site |
| Augusta & Co | London, United Kingdom | Visit site |
| Aurasolar.com | Madrid, Spain | Visit site |
| Auren Energia | São Paulo, Brazil | Visit site |
| Aureos | London, United Kingdom | Visit site |
| Ausecology | Brisbane, Australia | Visit site |
| Australia Wide Solar | Sydney, Australia | Visit site |
| Australian Renewable Energy Agency (ARENA) | Canberra, Australia | Visit site |
| Austria Solar | Vienna, Austria | Visit site |
| Autarco | Eindhoven, Netherlands | Visit site |
| Autonics Automation India Pvt. Ltd. | Navi Mumbai, India | Visit site |
| Autovert Technologies Pvt Ltd | Bengaluru, India | Visit site |
| Auttom | Caxias do Sul, Brazil | Visit site |
| Availon United Wind Service | Aarhus, Denmark | Visit site |
| Avalon Mechanical | Esquimalt, Canada | Visit site |
| Avasco Solar | Ieper, Belgium | Visit site |
| Avfall Sverige | Malmö, Sweden | Visit site |
| Avg Innovation-Connettiamo il mondo al sole attraverso soluzioni nel settore dell'energia solare | Rimini, Italy | Visit site |
| Avils Consulting Ltd | Bath, United Kingdom | Visit site |
| Axess Power | Doha, Qatar | Visit site |
| Axial Solar | Manuel, Spain | Visit site |
| Axis Renováveis | São Paulo, Brazil | Visit site |
| Axon' Cable | Fromentières, France | Visit site |
| Axtora Energy - Energy Cost Optimization, Waste Heat Conversion to Electrical Energy | Eberswalde, Germany | Visit site |
| Aydem Yenilenebilir Enerji | Merkezefendi, Türkiye | Visit site |
| Ayesa | Sevilla, Spain | Visit site |
| Ayming | Levallois-Perret, France | Visit site |
| Ayond | Blomsterdalen, Norway | Visit site |
| Ayrton Energy | Calgary, Canada | Visit site |
| Azets Consulting | Bergen, Norway | Visit site |
| Aztech Solar | Beresfield, Australia | Visit site |
| B Current Impact Investment Inc. | 臺北市, Taiwan | Visit site |
| B&K Management Consulting | Tel Aviv-Yafo, Israel | Visit site |
| B-InRoof | Wetzikon, Switzerland | Visit site |
| B.F. AUTOMATION S.R.L. | Belfiore, Italy | Visit site |
| BAM BAM Pile Driving | South West Rocks, Australia | Visit site |
| BAM UK & Ireland | London, United Kingdom | Visit site |
| BATKON Battery Control Technologies Inc. | Istanbul, Türkiye | Visit site |
| BAUER Elektroanlagen | Buchbach, Germany | Visit site |
| BBS Automation | Garching bei München, Germany | Visit site |
| BCHAR | Zürich, Switzerland | Visit site |
| BDHM Consultants PVT. LTD. | India | Visit site |
| BDSE électricité | Voreppe, France | Visit site |
| BEEM | Patna, India | Visit site |
| BERMAD | Hungerford, United Kingdom | Visit site |
| BFP Service | Madrid, Italy | Visit site |
| BG&E | Sydney, Australia | Visit site |
| BGC | Vancouver, Canada | Visit site |
| BGF | London, United Kingdom | Visit site |
| BGS | London, United Kingdom | Visit site |
| BHB SOLAR ENERJİ DANIŞMANLIK ANONİM ŞİRKETİ | Adapazarı, Türkiye | Visit site |
| BIGSOLAR Photovoltaic Systems | Greece | Visit site |
| BIOGAZ TECH | Ploërmel, France | Visit site |
| BIOGEST | Vienna, Austria | Visit site |
| BIOVEA Energie | Abidjan, Côte d'Ivoire | Visit site |
| BISOL Group | Prebold, Slovenia | Visit site |
| BISTON CONSTRUCTION COMPANY | Parauapebas, Brazil | Visit site |
| BK Energies - Energy Storage | Llanera, Spain | Visit site |
| BKW Energy | Bern, Switzerland | Visit site |
| BKW Italia S.p.A. | Italy | Visit site |
| BLISON CO. LIMITED | Bweyogerere, Uganda | Visit site |
| BLOCH3 | Krumbach, Austria | Visit site |
| BLOXS GmbH | Grünwald, Germany | Visit site |
| BMS HEAVY CRANES | Nørresundby, Denmark | Visit site |
| BNP Paribas Asset Management | France | Visit site |
| BNP Paribas CIB | Paris, France | Visit site |
| BPCL Renewable Energy | Mumbai, India | Visit site |
| BREMER AG | Paderborn, Germany | Visit site |
| BRIGHT | diadikasia | Chalandri, Greece | Visit site |
| BROSETA | Amadora, Portugal | Visit site |
| BRUC | Japan | Visit site |
| BRUGG GROUP AG | Brugg, Switzerland | Visit site |
| BRUGG Pipes District Heating Solutions | Kleindöttingen, Switzerland | Visit site |
| BS Dağıtık Enerji Sistemleri Ltd. Sti. | Etimesgut, Türkiye | Visit site |
| BS Solar Pakistan | Lahore, Pakistan | Visit site |
| BSI | London, United Kingdom | Visit site |
| BSK Claus Baurmann | Harsum, Germany | Visit site |
| BUCHEN | Köln, Germany | Visit site |
| BVES Energy Storage Systems Association | Berlin, Germany | Visit site |
| BVi Consulting Engineers - BVi Group | Pretoria, South Africa | Visit site |
| BW GLOBAL | Abbotsford, Canada | Visit site |
| BWTS France | Amiens, France | Visit site |
| BWTS GmbH | Hamburg, Germany | Visit site |
| BaTTeRi | Ituzaingó, Argentina | Visit site |
| BackingMinds | Stockholm, Sweden | Visit site |
| Bahra Electric | Agolada, Spain | Visit site |
| Baja Renewable Solutions | Tijuana, Mexico | Visit site |
| Balfour Beatty plc | London, United Kingdom | Visit site |
| Balkon Solar | Gendt, Netherlands | Visit site |
| Balkon.Solar e.V. | Freiburg im Breisgau, Germany | Visit site |
| Balmoral Comtec | Aberdeen, United Kingdom | Visit site |
| Balmoral Group | Aberdeen, United Kingdom | Visit site |
| Balteau Produtos Elétricos Ltda - Grupo WEG | Itajubá, Brazil | Visit site |
| Baltic Energy | Rønne, Denmark | Visit site |
| Bandora | Porto, Portugal | Visit site |
| Banga Solar Pvt Ltd | Ahmedabad, India | Visit site |
| Banpu Power Public Company Limited | Bangkok, Thailand | Visit site |
| Banverde | Mexico | Visit site |
| Baraclit SpA | Bibbiena, Italy | Visit site |
| Baran Group | Bet Dagan, Israel | Visit site |
| Baringa | London, United Kingdom | Visit site |
| Barone International | Manila, Philippines | Visit site |