| Rayshely Power | China | Visit site |
| Raytech New Energy Materials | China | Visit site |
| Rayton | Kyiv, Ukraine | · |
| Raywell Studio Pvt. Ltd. | Ahmedabad, India | Visit site |
| Re Sustainability Limited | Hyderabad, India | Visit site |
| Re-Twin Energy | Pontevedra, Argentina | Visit site |
| ReFeel EPC Italia | Casalpusterlengo, Italy | Visit site |
| RePG Enerji Sistemleri San. ve Tic. A.Ş. | Sarıyer, Türkiye | Visit site |
| ReVolta | Uccle, Belgium | · |
| Ready Solar Inc | Burnaby, Canada | Visit site |
| Real Ventures | Montréal, Canada | Visit site |
| Reap Battery USA | Tuzla, Türkiye | Visit site |
| Reap Battery USA | Pendik, Türkiye | Visit site |
| Reap Battery USA | Istanbul, Türkiye | Visit site |
| Rebaba | Stockholm, Sweden | · |
| Rechargeables Inc | Burlington, Canada | · |
| Rechargion Energy | Pune, India | Visit site |
| Rechargion Energy | Mulshi, India | Visit site |
| Recontek | Riga, Latvia | Visit site |
| Recoolit | Indonesia | Visit site |
| Recsun Solar | Changzhou Shi, China | Visit site |
| Rectify Solar Philippines | San Jose del Monte City, Philippines | Visit site |
| RecycLiCo Battery Materials | Surrey, Canada | Visit site |
| Recycle Solar Technologies | Scunthorpe, United Kingdom | Visit site |
| Red Rock Renewables | Edinburgh, United Kingdom | Visit site |
| Red Rocket South Africa (Pty) Ltd | Rwanda | Visit site |
| RedField | Brescia, Italy | Visit site |
| RedSolar | Changsha Shi, China | Visit site |
| Redarc Electronics | Adelaide, Australia | Visit site |
| Redback Technologies | Brisbane, Australia | · |
| Redo Biosolutions | Porsgrunn, Norway | Visit site |
| RedoxNRG | Narva, Estonia | Visit site |
| Redsun New Energy | Shenzhen Shi, China | Visit site |
| Redway Power | Shenzhen Shi, China | Visit site |
| Reefy | Delft, Netherlands | Visit site |
| Reenpro - Renewable Energy Projects | Medininkai, Lithuania | Visit site |
| Regascold | Aachen, Germany | Visit site |
| Regen Power Pty Ltd | Perth, Australia | Visit site |
| Regen Power Pty Ltd | Adelaide, Australia | Visit site |
| Regen Power Pty Ltd | Brisbane, Australia | Visit site |
| Regen Power Pty Ltd | Sydney, Australia | Visit site |
| Regen Power Pty Ltd | Melbourne, Australia | Visit site |
| RegenX | Melbourne, Australia | Visit site |
| Regener8 Power | London, United Kingdom | Visit site |
| Regiolux International | Königsberg in Bayern, Germany | Visit site |
| Regiolux International | Gangkofen, Germany | Visit site |
| Regiolux Nederland B.V. | Woerden, Netherlands | Visit site |
| Regran | Santa Croce Camerina, Italy | Visit site |
| Reiling Group | Harsewinkel, Germany | Visit site |
| Reinhard Haustechnik AG | Sarnen, Switzerland | Visit site |
| Rejlers | Hägersten, Sweden | · |
| Rekart Innovations Private Limited | Gurugram, India | Visit site |
| Release by Scatec | Oslo, Norway | Visit site |
| Relectrify | Melbourne, Australia | · |
| Reliance Energy | Lahore, Pakistan | Visit site |
| Reliance Industries Limited | Navi Mumbai, India | Visit site |
| Reliance Power Limited | India | Visit site |
| Reliance Renewable Energy Pvt Ltd | Kathmandu, Nepal | Visit site |
| Relion | Montréal, Canada | · |
| Relode | London, United Kingdom | Visit site |
| Rely | Brussels, Belgium | Visit site |
| Rematek-Energie - Wholesaler of renewable energy equipment | Saint-Laurent, Canada | Visit site |
| Rematter | Zug, Switzerland | Visit site |
| Remedium | Cambridge, United Kingdom | Visit site |
| Remora Technology | Gebze, Türkiye | Visit site |
| Remora Technology | Pendik, Türkiye | Visit site |
| RemoteSolar GmbH | Aachen, Germany | Visit site |
| RenEnergy UK | Norwich, United Kingdom | · |
| Renaissance Fusion | Saint-Priest, France | Visit site |
| Renalfa | Vienna, Austria | Visit site |
| Renasci Oostende | Oostende, Belgium | Visit site |
| Renco | Pesaro, Italy | Visit site |
| Renel Energy & Power Engineering | Thessaloniki, Greece | · |
| Renepoly Energy | Guangzhou Shi, China | Visit site |
| Renera Energy Germany | Freiburg im Breisgau, Germany | Visit site |
| Renergeia Group | Bogotá, Colombia | Visit site |
| Renergetica | Genova, Italy | Visit site |
| Renergia | Polignano a Mare, Italy | Visit site |
| Renerix Solar | Ciudad Real, Spain | Visit site |
| Renesas Electronics | 東京都, Japan | Visit site |
| Renesola | Changzhou Shi, China | · |
| Renesource Inc. | Manila, Philippines | Visit site |
| Renevo Energy | Ankara, Türkiye | Visit site |
| Renevolt | Ål, Norway | Visit site |
| RenewCo Solar | Ourimbah, Australia | Visit site |
| Renewable Connections | London, United Kingdom | Visit site |
| Renewable Dispatching | Milano, Italy | Visit site |
| Renewable Energy Association of Nigeria | Abuja Municipal, Nigeria | Visit site |
| Renewable Energy Company | Napoli, Italy | Visit site |
| Renewable Energy Society Australia | Melbourne, Australia | Visit site |
| Renewable Energy Society of India (RESI) | New Delhi, India | Visit site |
| Renewable Field Services Blade Repair & GWO's | Lydbury North, United Kingdom | Visit site |
| Renewable Power Capital | London, United Kingdom | Visit site |
| Renewable Safi Power International Ltd | Nairobi, Kenya | Visit site |
| Renewable Sweden | Falkenberg, Sweden | Visit site |
| RenewableUK | London, United Kingdom | Visit site |
| RenewableWorks | · | Visit site |
| Renewco Power | Glasgow, United Kingdom | Visit site |
| Renewgain Private Limited | Ahmedabad, India | · |
| Renewly Solar | Stellarton, Canada | Visit site |
| Renewo | Milano, Italy | Visit site |
| Reneworld Ltd | Vacoas-Phoenix, Mauritius | Visit site |
| Renexia Spa | Chieti, Italy | Visit site |
| Reno Energy | Liège, Belgium | Visit site |
| Renom Energy Services Private Limited | Pune, India | Visit site |
| Renotec NV | Geel, Belgium | Visit site |
| Renotec NV | Wijnegem, Belgium | Visit site |
| Renotec NV | Puurs-Sint-Amands, Belgium | Visit site |
| Renotec NV | Gent, Belgium | Visit site |
| Renotec NV | Brussels, Belgium | Visit site |
| Renotec NV | Waremme, Belgium | Visit site |
| Renova Energia SA | São Paulo, Brazil | Visit site |
| Renovables Palau | Palau-solità i Plegamans, Spain | Visit site |
| Renovatio Group | Bucharest, Romania | Visit site |
| Renovigi | Santa Catarina Island, Brazil | Visit site |
| Renovit | Milano, Italy | Visit site |
| Renpower | Casablanca, Morocco | Visit site |
| Rentel NV | Oostende, Belgium | Visit site |
| Rentel NV | Deal, United Kingdom | Visit site |
| Renwasol Renewable Energy & Water Solutions | Kabwe, Zambia | Visit site |
| Reolum | Madrid, Spain | Visit site |
| Reon Energy Limited | Karachi, Pakistan | · |
| Reoptimize Systems | Edinburgh, United Kingdom | Visit site |
| Reparar Works | Mumbai, India | Visit site |
| Repowered | Groningen, Netherlands | · |
| Reqip | New Delhi, India | Visit site |
| Resalta | Ljubljana, Slovenia | Visit site |
| Residential Energy Storage Battery Supplier | Guangzhou Shi, China | Visit site |
| Resolve Energia Solar | Belém, Brazil | Visit site |
| Resources Technology Co., Ltd (SRP) | 高雄市, Taiwan | Visit site |
| Responsible Energy Partners | United States | · |
| Rest Enerji | Kale, Türkiye | Visit site |
| Resun Solar Energy | Suzhou Shi, China | Visit site |
| Reswitch | Melbourne, Australia | · |
| Return | Amsterdam, Netherlands | Visit site |
| Revalue Energies | Milano, Italy | Visit site |
| Reventus Power | London, United Kingdom | Visit site |
| Revergy | Spain | · |
| Reverion | Eresing, Germany | Visit site |
| Revfin | New Delhi, India | Visit site |
| Revo Energia | São Paulo, Brazil | Visit site |
| Revolt Energy | Rabka-Zdrój, Poland | Visit site |
| Rexel | Paris, France | Visit site |
| Reykjavik Geothermal | Reykjavík, Iceland | Visit site |
| Reykjavik Geothermal | Iceland | Visit site |
| Rezolv Energy | Praha, Czech Republic | Visit site |
| RheEnergise | London, United Kingdom | Visit site |
| Rhofa Energy | Çerkezköy, Türkiye | Visit site |
| Rhofa Energy | Çerkezköy, Turkey | Visit site |
| Ric Energy Group | Madrid, Spain | Visit site |