| Polyeco | Athina, Greece | Visit site |
| Polytrade Global | Bucharest, Romania | Visit site |
| Pomerleau | Saint-Jacques, Canada | Visit site |
| Ponte Nova Energia | Rio de Janeiro, Brazil | Visit site |
| Portugal Ventures | Camarate, Portugal | Visit site |
| Positive Energy Solutions Pty Ltd | Australia | Visit site |
| Posse Herrera Ruiz | Barranquilla, Colombia | Visit site |
| Power & Precision Energy | Calgary, Canada | Visit site |
| Power Edge Engineering | Adelaide, Australia | Visit site |
| Power Electronics | Llíria, Germany | Visit site |
| Power Expert | Melbourne, Australia | Visit site |
| Power International Holding | Doha, Qatar | Visit site |
| Power Line Magazine | New Delhi, India | Visit site |
| Power Pro Solutions Inc | York, Canada | Visit site |
| Power Sun Energy - PSE | Tunis, Tunisia | Visit site |
| PowerBee.energy | Belgium | Visit site |
| PowerCurve | Aalborg, Denmark | Visit site |
| PowerDeal | Herstal, Belgium | Visit site |
| PowerVolt | Breda, Netherlands | Visit site |
| Powerark Solar | Melbourne, Australia | Visit site |
| Powerchina International Group Limited Sucursal Colombia | Abidjan, China | Visit site |
| Powerex | Vancouver, Canada | Visit site |
| Powernice | Ningbo Shi, China | Visit site |
| Powertec | Amsterdam, Netherlands | Visit site |
| Powertrac | Dhaka, Bangladesh | Visit site |
| Powerway | Fuoshan Shi, China | Visit site |
| PowiDian Energy | La Ville-aux-Dames, France | Visit site |
| Pradecon | Arcos, Portugal | Visit site |
| Prado Energia | Lisboa, Portugal | Visit site |
| Pragma Industries | Biarritz, France | Visit site |
| PreZero España | Madrid, Spain | Visit site |
| Preishouse GmbH | Chemnitz, Germany | Visit site |
| Premier Energies Limited | India | Visit site |
| Premier Environmental Services Inc. | Cambridge, Canada | Visit site |
| Premium Solaranlagen GmbH | München, Germany | Visit site |
| Prime Capital AG | Frankfurt am Main, Germany | Visit site |
| Prisma Energia Solar e Eficiência Energética | Itajaí, Brazil | Visit site |
| Prisma Solar Energia | São Paulo, Brazil | Visit site |
| Prizma Endüstri | Ankara, Türkiye | Visit site |
| ProPlanEn | Heidelberg, Germany | Visit site |
| ProSolar | Charlotte Amalie, US Virgin Islands | Visit site |
| Profilodomi | Portaria, Greece | Visit site |
| Progressive Green Solutions | Perth, Australia | Visit site |
| Progressum Energy Developments | Pozuelo de Alarcón, Italy | Visit site |
| Projeto Legal Engenharia Inteligente | Getúlio Vargas, Brazil | Visit site |
| Properate | Port Moody, Canada | Visit site |
| Protecnium | Mérida, Spain | Visit site |
| Protonera | Cambridge, United Kingdom | Visit site |
| Provident Energy Management | Vaughan, Canada | Visit site |
| Proxima Fusion | München, Germany | Visit site |
| ProyectaRenovables | Madrid, Spain | Visit site |
| Proyectos Integrales del Ecuador PIL S.A. | Quito, Ecuador | Visit site |
| Proyten | Napoli, Italy | Visit site |
| PuREEnergy India | Hyderabad, India | Visit site |
| Punta | Helsinki, Finland | Visit site |
| Purammon Ltd. | Bet Shemesh, Israel | Visit site |
| Pure Energie | Enschede, Netherlands | Visit site |
| Pure Solar | Wuxi Shi, China | Visit site |
| Purpose Capital | New Zealand | Visit site |
| Pysé | Bengaluru, India | Visit site |
| Q CELLS Italia | Berlin, Germany | Visit site |
| Q Power Oy | Parainen, Finland | Visit site |
| Q-Bot Ltd | Worthing, United Kingdom | Visit site |
| Q-SUN Solar | Nanjing Shi, China | Visit site |
| QALITEC | Darmstadt, Germany | Visit site |
| QANNT | Béziers, France | Visit site |
| QD-SOL LTD. | San Rafael, Argentina | Visit site |
| QEED | Longarone, Italy | Visit site |
| QKSOL - ENERGY SOLUTIONS | El Papiol, Spain | Visit site |
| QMC Metering Solutions | Port Coquitlam, Canada | Visit site |
| QST Power Energy | غرب الجليب - الشدادية, Kuwait | Visit site |
| QUADRA energy | Düsseldorf, Germany | Visit site |
| QUBIZ.team | Bilbao, Spain | Visit site |
| QX Global Group | India | Visit site |
| Qair France - Qair Group | Montpellier, France | Visit site |
| Qair UK - Qair Group | Liverpool, United Kingdom | Visit site |
| Qifan Cable | Pilot Mound, Canada | Visit site |
| Qinfeng Wire and Cable | China | Visit site |
| Quantum Saudi ESCO | Ad Dammam, Bahrain | Visit site |
| Qube Technologies | Calgary, Canada | Visit site |
| Quinn Downes Group | Dublin, Ireland | Visit site |
| R-energy | Eindhoven, Netherlands | Visit site |
| RANA ENERGY CO. | Bushehr, Iran | Visit site |
| RASLAG Corp. | Mexico, Philippines | Visit site |
| RAW Energy | Kuala Lumpur, Malaysia | Visit site |
| RAW Solid Fuels | Kuala Lumpur, Malaysia | Visit site |
| RCD | Barcelona, Spain | Visit site |
| RE Technologies GmbH | Hamburg, Germany | Visit site |
| RE:GEN Group | Sunderland, United Kingdom | Visit site |
| REA GLOBAL | Redland Bay, Australia | Visit site |
| REAL ALPHA | Lugano, Italy | Visit site |
| REALI | Lima, Chile | Visit site |
| REAR®(Renewable Energy Association of Rajasthan) - Industry Body - Solar Association - NGO | Jaipur, India | Visit site |
| REBI | Aranda de Duero, Spain | Visit site |
| REC Group | Staré Město, Czech Republic | Visit site |
| RED Engineering Design | London, United Kingdom | Visit site |
| REDEN | Roquefort, France | Visit site |
| REECO Group | Germany | Visit site |
| REGGIO | San Miguel, Chile | Visit site |
| REMONDIS Gruppe | Lünen, Germany | Visit site |
| REMONDIS Production GmbH | Lünen, Germany | Visit site |
| REMONDIS Sverige | Hisings Backa, Sweden | Visit site |
| RENAISSANCE CAPITAL d.o.o. | Sesvete, Croatia | Visit site |
| RENQ Power Solutions India Pvt Ltd | Kochi, India | Visit site |
| REPP (Renewable Energy Performance Platform) | London, United Kingdom | Visit site |
| REVCOO | Vénissieux, France | Visit site |
| RFC Ambrian | Sydney, Australia | Visit site |
| RHI Magnesita | Vienna, Austria | Visit site |
| RINA | Genova, Italy | Visit site |
| RITEWAYS | India | Visit site |
| RM Surveys | Broome, Australia | Visit site |
| RMB Hydroseeding | Dursley, United Kingdom | Visit site |
| ROEF | Son en Breugel, Netherlands | Visit site |
| ROHM Semiconductor Europe | Willich, Germany | Visit site |
| ROSI | Grenoble, France | Visit site |
| ROTORWORKS GmbH | Berlin, Germany | Visit site |
| RP Global | Madrid, Austria | Visit site |
| RP Solar | Chennai, India | Visit site |
| RPS Switchgear SA (Switchgear & Electrical Engineering Services) | Boksburg, South Africa | Visit site |
| RS WINDTECH ENGINEERS (P) LTD | Thovala, India | Visit site |
| RSF Capital Partners LLP | London, United Kingdom | Visit site |
| RSK Group | Frodsham, United Kingdom | Visit site |
| RSM Spain | Barcelona, Spain | Visit site |
| RUDRA SOLAR ENERGY | Ahmedabad, India | Visit site |
| Rabot Dutilleul Construction | Belgium | Visit site |
| Radial Torque Tools B.V. | Soest, Netherlands | Visit site |
| Radiocrafts | OSLO, Norway | Visit site |
| Raijin Solar Energy LLP | Ahmedabad, India | Visit site |
| Rainbow Steel | Tianjin, China | Visit site |
| Raiseking Lighting | Guangzhou Shi, China | Visit site |
| Raj Petro - A Brenntag Group Company | Chennai, India | Visit site |
| Ramboll | · | Visit site |
| Ramery | Erquinghem-Lys, France | Visit site |
| Ramesh Corp. | Tripureswor, Nepal | Visit site |
| Ramón y Cajal Abogados | Madrid, Spain | Visit site |
| Rana Energy (Techstars ‘23) | London, United Kingdom | · |
| Rank® – Organic Rankine Cycle (ORC) and High-Temperature Heat Pumps (HTHP) | Spain | Visit site |
| Ravano Power | Cogoleto, Italy | Visit site |
| Rayleigh Solar Tech | Canada | Visit site |
| Raymetrics S.A. | Amarousio, Greece | Visit site |
| Raymond Solar | Göteborg, Sweden | Visit site |
| Rayshely Power | China | Visit site |
| Re Sustainability Limited | Hyderabad, India | Visit site |
| Real Ventures | Montréal, Canada | Visit site |
| Reap Battery USA | Istanbul, Türkiye | Visit site |
| Rechargion Energy | Mulshi, India | Visit site |
| Recontek | Riga, Latvia | Visit site |
| Recoolit | Indonesia | Visit site |
| Redarc Electronics | Adelaide, Australia | Visit site |
| Redo Biosolutions | Porsgrunn, Norway | Visit site |