| Renewable Energy Society Australia | Melbourne, Victoria | Visit site |
| Renewable Energy Society of India (RESI) | New Delhi, Delhi | Visit site |
| Renewable Energy Solutions | Sas Nagar, Punjab | Visit site |
| Renewable Engineered Applications, LLC | Dryden, New York | Visit site |
| Renewable Field Services Blade Repair & GWO's | Lydbury North, England | Visit site |
| Renewable Thermal Collaborative | Arlington, Virginia | Visit site |
| RenewableWorks | · | Visit site |
| Renewo | Milano, Milan | Visit site |
| Renewvia Energy | Atlanta, Georgia | Visit site |
| Renix Energy | Giza | Visit site |
| Rennsteig Tools Inc. | · | Visit site |
| Reno Energy | Liège, Liege | Visit site |
| Renon Power | McKinney, Texas | Visit site |
| Renotec NV | Geel, Antwerp | Visit site |
| Renovables Palau | Palau-solità i Plegamans, Barcelona | Visit site |
| Renovit | Milano, Milan | Visit site |
| Renpower | Casablanca, Casablanca-Settat | Visit site |
| Rentel NV | Oostende, West Flanders | Visit site |
| Renu Robotics | San Antonio, Texas | Visit site |
| Renwasol Renewable Energy & Water Solutions | Kabwe, Central | Visit site |
| Reolum | Madrid, Madrid | Visit site |
| RepAir Carbon Capture | Niles, Illinois | Visit site |
| Reparar Works | Mumbai, Maharashtra | Visit site |
| Repcon, Inc. | Baton Rouge, Louisiana | Visit site |
| ReportAll USA | Huntsburg, Ohio | Visit site |
| ResFarm | Milano, Milan | Visit site |
| Resalta | Ljubljana, Ljubljana | Visit site |
| Resolve Energia Solar | Belém, Pará | Visit site |
| Resource Innovations | Half Moon Bay, California | Visit site |
| Rethink Electric | Wood Dale, Illinois | Visit site |
| Retract | Boulder, Colorado | Visit site |
| Retro-Tech Systems, LLC | Valparaiso, Indiana | Visit site |
| Reunion | Dubai | Visit site |
| Revalue Energies | Milano, Milan | Visit site |
| Reverse Energy Solutions Corp | Chicago, Illinois | Visit site |
| Revfin | New Delhi, Delhi | Visit site |
| Revo Energia | São Paulo, São Paulo | Visit site |
| Rexgear, Inc. | Irvine, California | Visit site |
| Reykjavik Geothermal | Reykjavík, Capital Region | Visit site |
| ReynKo | New York, New York | Visit site |
| Rhine Solar | New Delhi, Delhi | · |
| Rhino Renewables Solar & Electric | Asheville, North Carolina | Visit site |
| Rhino Tool Company | Kewanee, Illinois | Visit site |
| Rhino Tool House | Concord, North Carolina | Visit site |
| Rhofa Energy | Çerkezköy, Tekirdağ | Visit site |
| Rialto Cables | Argyle, New York | Visit site |
| Ricardo | London, England | Visit site |
| Richard Crookes Constructions | Sydney, New South Wales | Visit site |
| Richard Heath & Associates, Inc. (RHA) | Fresno, California | Visit site |
| Richland County Economic Development Office | Columbia, South Carolina | Visit site |
| Richmond Renewables Yorkshire Ltd | Richmond, England | Visit site |
| Riesco y Asociados | El Trébol, Santa Fe | Visit site |
| Right Angle Contracting Inc. | Sterling, Virginia | Visit site |
| Right Angle Engineering | Orem, Utah | Visit site |
| Rikur Energy Inc. | Burnaby, British Columbia | Visit site |
| Rinascita Holding | Roma, Rome | Visit site |
| Rincon Consultants | Ventura, California | Visit site |
| Risa Solar LLC | New York, New York | Visit site |
| Risen Energy Co., Ltd | Ninghai, Ningbo | Visit site |
| Risin Energy | Beijing, Beijing | Visit site |
| Risun | Murray, Utah | Visit site |
| Ritalia Funding | Ventura, California | Visit site |
| Ritar Power | Shenzhen Shi, Guangdong | Visit site |
| Rittal GmbH & Co. KG | Herborn, Hesse | Visit site |
| Rittmeyer Group | Baar, Zug | Visit site |
| Ritz Instrument Transformers USA | Lavonia, Georgia | Visit site |
| River & Sea Energy | Skallestad, Vestfold | Visit site |
| River City Construction | Washington, North Carolina | Visit site |
| River Parish Contractors | Reserve, Louisiana | Visit site |
| Riverside Automation Ltd. | Sheffield, England | Visit site |
| Riwatt Solar Co.,Limited | Jiaxing Shi, Zhejiang | Visit site |
| Rixin Solar | Wuhan Shi, Hubei | Visit site |
| RoMiotto Indústria e Comércio de Instrumentos de Medição Ltda | São Paulo, São Paulo | Visit site |
| RoadSmart | Shenzhen Shi, Guangdong | Visit site |
| Robert Bird Group | Brisbane, Queensland | Visit site |
| RobotPlusPlus | Huanggang Shi, Hubei | Visit site |
| Roboteos Inc. | Costa Mesa, California | Visit site |
| Robotnik Automation | Paterna, Valencia | Visit site |
| Rocking Solar | Monroe, Ohio | Visit site |
| Rockwell Automation | Milwaukee, Wisconsin | Visit site |
| Rocky Point Engineering Ltd. | Langley, British Columbia | Visit site |
| Rodigas | Limena, Padua | Visit site |
| Rogers Electric | Alpharetta, Georgia | Visit site |
| Rogers Mechanical Contractors | Douglasville, Georgia | Visit site |
| Rokas Renewables (Iberdrola Renovables) | Melbourne, Victoria | Visit site |
| Roland Berger | München, Bavaria | Visit site |
| Roll Group | Capelle aan den IJssel, South Holland | Visit site |
| Roller Die + Forming | Louisville, Kentucky | Visit site |
| Rolls Battery Engineering | Springhill, Nova Scotia | Visit site |
| Romagnole | Mandaguari, Paraná | Visit site |
| Romeo Power, Inc. (acquired by Nikola Corporation) | Santa Clara, California | Visit site |
| Rongma New Energy | Wuxi Shi, Jiangsu | Visit site |
| Rongstar Energy GmbH | Aldenhoven, North Rhine-Westphalia | Visit site |
| Rongstar Energy Polska | Würselen, North Rhine-Westphalia | Visit site |
| Roodenburg Groep | Krimpen aan den IJssel, South Holland | Visit site |
| Roof Tech, Inc. | San Diego, California | Visit site |
| Rope Access Sverige AB | Solna, Stockholm | Visit site |
| Rose City Robotics | Portland, Oregon | Visit site |
| Rosen Solar | Hefei Shi, Anhui | Visit site |
| Rosendin | San Jose, California | Visit site |
| Rothschild & Co | Penzlin, Mecklenburg-Western Pomerania | Visit site |
| RoviSys | Aurora, Ohio | Visit site |
| Royal Electric Company | Sacramento, California | Visit site |
| Royal Solar Energy | Multan, Punjab | Visit site |
| RoyalCert Türkiye | Watertown, Massachusetts | Visit site |
| Rubicon | Blouberg, Western Cape | Visit site |
| Ruchira Green Earth | Panchkula, Haryana | Visit site |
| Ruitian Cable | Shijiazhuang Shi, Hebei | Visit site |
| RunTime Solar | White River Junction, Vermont | Visit site |
| Rux Energy | Sydney, New South Wales | Visit site |
| Ruya Energy | Sanaa, Sanaa | Visit site |
| Ryder System, Inc. | Medley, Florida | Visit site |
| Rystad Energy | Oslo, Oslo | Visit site |
| Ryter Cooperative Industries | Highland Park, Michigan | Visit site |
| RÖNESANS HOLDİNG | Çankaya, Ankara | Visit site |
| Rönesans Enerji | Ankara, Ankara | Visit site |
| respect energy | Warszawa, Masovian Voivodeship | Visit site |
| roltec | Zalasewo, Greater Poland Voivodeship | Visit site |
| r³energy by Reneryx Alternative Energy | St. Petersburg, Florida | · |