| Omtech Electricals Solutions Pvt. Ltd. | Bengaluru, India | Visit site |
| Ondulit Italiana | Fiumicino, Italy | Visit site |
| One Power Solar | Gold Coast, Australia | Visit site |
| One Zone | Hong Kong | Visit site |
| OnePower | Maseru, Lesotho | Visit site |
| Onitl | Yangzhou Shi, China | Visit site |
| Ontario Energy Board | Toronto, Canada | Visit site |
| Ontario Power Generation | Toronto, Canada | Visit site |
| Ontario Teachers' Pension Plan | Toronto, Canada | Visit site |
| Onur Group | Türkiye | Visit site |
| Onyx Solar | Ávila, Spain | Visit site |
| Op Naar Nul | Arnhem, Netherlands | Visit site |
| Opea | São Paulo, Brazil | Visit site |
| OpenStar Technologies | Wellington, New Zealand | Visit site |
| Operadores Nacionales | Guatemala | Visit site |
| Optec AG | Wetzikon, Switzerland | Visit site |
| Opteco | Zonhoven, Belgium | Visit site |
| OptiMAXX | Bengaluru, India | Visit site |
| Optimize Energy | Madrid, Spain | Visit site |
| Orange Solar | Johannesburg, South Africa | Visit site |
| Orano | Paris, France | Visit site |
| Orascom Construction PLC | Cairo, Egypt | Visit site |
| Orchid Solar | Edinburgh, United Kingdom | · |
| Oritia & Boreas | Granada, Spain | Visit site |
| Orka náttúrunnar / ON Power | Reykjavík, Iceland | Visit site |
| Orkan Automação Industrial | Indaiatuba, Brazil | Visit site |
| Orkland Energi | Fannrem, Norway | Visit site |
| Orkuveitan | Reykjavík, Iceland | Visit site |
| Ormazabal | Derio, Spain | Visit site |
| Osda Solar | Ningbo Shi, China | Visit site |
| Oso Polar Energy | Móstoles, Spain | Visit site |
| Otary RS NV | Oostende, Belgium | Visit site |
| Ottawa Electrical Contractors' Association | Ottawa, Canada | Visit site |
| Ottawa Solar Power | Ottawa, Canada | Visit site |
| Ourolux Iluminação e Energia Solar | Santos, Brazil | Visit site |
| Oushang Photovoltaic | Shijiazhuang Shi, China | Visit site |
| Over Easy Solar | Oslo, Norway | Visit site |
| Oxera Consulting LLP | Amsterdam, Belgium | Visit site |
| Oze Grup | Ankara, Türkiye | Visit site |
| P.S.P. Specialties Public Company Limited | Bangkok, Thailand | Visit site |
| P3C Technology and Solutions Pvt Ltd | Narnaul, India | Visit site |
| PA Consulting | London, United Kingdom | Visit site |
| PAC Group | Ballymena, United Kingdom | Visit site |
| PDL Group | Hexham, United Kingdom | Visit site |
| PE Teknik & Arkitektur | Stockholm, Sweden | Visit site |
| PEAK Wind | Aarhus, Denmark | Visit site |
| PEMA | Brussels, Belgium | Visit site |
| PERI | Weißenhorn, Germany | Visit site |
| PES Group | Rosignano Marittimo, Italy | Visit site |
| PETRONAS | Kuala Lumpur, Malaysia | Visit site |
| PGE Polska Grupa Energetyczna | Warszawa, Poland | Visit site |
| PGL Environmental Consultants | Canada | Visit site |
| PIL PERU - Servicios de Ingeniería | Lima, Peru | Visit site |
| PIMEW – Polish Offshore Wind Industry Chamber | Gdynia, Poland | Visit site |
| PIONIERKRAFT | München, Germany | Visit site |
| PIZZAROTTI SA | China | Visit site |
| PKR Offshore Co., Ltd | 汐止區, Taiwan | Visit site |
| PMT | Stadtsteinach, Germany | Visit site |
| PORR Polska | Warszawa, Poland | Visit site |
| POWER TREE | Hassan, India | Visit site |
| POWESCO | Boulogne-Billancourt, France | Visit site |
| PPAM Solkraft | Ljungsbro, Sweden | Visit site |
| PPC S.A. | Brisbane, Australia | Visit site |
| PR Power Engineers Pvt Ltd | Chennai, India | Visit site |
| PRACSIS | Auderghem, Belgium | Visit site |
| PRASARANA MALAYSIA BERHAD | Kuala Lumpur, Malaysia | Visit site |
| PREFABBRICATI GUERRINI SRL | Santhià, Italy | Visit site |
| PROINSO Award-Winning Services for Solar Energy Projects | Windsor, United Kingdom | Visit site |
| PROPOINT | Gliwice, Poland | Visit site |
| PROSTER | Brzesko, Poland | Visit site |
| PROWATT | Adapazarı, Türkiye | Visit site |
| PRUiM SA - GLIWICE | Gliwice, Poland | Visit site |
| PSA International | Singapore | Visit site |
| PSP Dynamic | Bharatpur, India | Visit site |
| PSP Projects Limited | Ahmedabad, India | Visit site |
| PT CTCI INTERNATIONAL INDONESIA | Jakarta, Indonesia | Visit site |
| PT Datang DSSP Power Indonesia | Akole, India | Visit site |
| PT Gree Electric Appliances Indonesia | Jakarta Utara, Indonesia | Visit site |
| PT Penjaminan Infrastruktur Indonesia (Persero) | Jakarta, Indonesia | Visit site |
| PT Sarana Multi Infrastruktur (Persero) | Jakarta, Indonesia | Visit site |
| PT Shenhua Guohua Pembangkitan Jawa Bali | Serang, Indonesia | · |
| PT&I | Adelaide, Australia | Visit site |
| PT(Xiamen)New Energy Co.,Ltd | Xiamen Shi, China | Visit site |
| PT. Nusa Solar Indonesia | Batam, Indonesia | Visit site |
| PT. Pantja Putra Mashindo | Bekasi, Indonesia | Visit site |
| PT. VOKSEL ELECTRIC Tbk | Ciamis, Indonesia | Visit site |
| PT. Wedosolar Indonesia | Tangerang, Indonesia | Visit site |
| PTI Transformers | Regina, Canada | Visit site |
| PTW Energy Services | Rocky View County, Canada | Visit site |
| PUREPOWER Engineering SA | Rosenheim, Germany | Visit site |
| PV Mounts | Xiamen Shi, China | Visit site |
| PV Partner | Altınekin, Türkiye | Visit site |
| PV Solutions Inc. | Cebu City, Philippines | Visit site |
| PVMAINT | Chalandri, Greece | Visit site |
| PVMars Solar | Fuoshan Shi, China | Visit site |
| Pacific Ropes | Burnaby, Canada | Visit site |
| Pacific Sun Solar | Melbourne, Australia | Visit site |
| Paharpur Cooling Towers | Kolkata, India | Visit site |
| Palladio Partners | Frankfurt am Main, Germany | Visit site |
| Pampa Energia | Argentina | Visit site |
| Panda Solar | Dhaurahara, India | Visit site |
| Pantegra Ingenieure GmbH | Neu-Isenburg, Germany | Visit site |
| Paramount Wires & Cables | New Delhi, India | Visit site |
| Parkwind | Leuven, Belgium | Visit site |
| Parlym | Marseille, France | Visit site |
| Particip GmbH | Freiburg im Breisgau, Germany | Visit site |
| Patil Automation Ltd. | Chakan, India | Visit site |
| Patras Science Park ( Επιστημονικό Πάρκο Πατρών) | Patra, Greece | Visit site |
| Peaceinvest | Genève, Switzerland | Visit site |
| Pecso | Abu Dhabi, United Arab Emirates | Visit site |
| Pekintaş Construction | Düzce, Türkiye | Visit site |
| Penfolds Roofing & Solar | Coquitlam, Canada | Visit site |
| Penspen | London, United Kingdom | Visit site |
| Pentas Flora | Kuala Lumpur, Malaysia | Visit site |
| Perfection Électrique | Saint-Léonard, Canada | Visit site |
| Perth Solar Force | Perth, Australia | Visit site |
| Perth Solar Warehouse | Perth, Australia | Visit site |
| Petra Energia Solar Vinhedo e Região | Brazil | Visit site |
| Petrokon Utama Sdn Bhd | Abu Dhabi, Brunei | Visit site |
| Petrol Group | Ljubljana, Slovenia | Visit site |
| Phaesun | Memmingen, Germany | Visit site |
| Phasor Engineering Inc | Calgary, Canada | Visit site |
| Philippi Prietocarrizosa Ferrero DU & Uria | Barranquilla, Chile | Visit site |
| Phlair | München, Germany | Visit site |
| Phocos | Ulm, Germany | Visit site |
| Photomapping | Perth, Australia | Visit site |
| Photovoltaic Solar | Amreli, India | Visit site |
| Photowatt | Bourgoin-Jallieu, France | Visit site |
| Pi Green Innovations Pvt. Ltd. | India | Visit site |
| PiLDER | Kadıköy, Türkiye | Visit site |
| Piled Co | · | Visit site |
| Pilsan Elektronik | Ümraniye, Türkiye | Visit site |
| Pinchin in Canada | Mississauga, Canada | Visit site |
| Pioneer Xenergy Pvt. Ltd | Chennai, India | Visit site |
| Pknergy Energy | 八里區, Taiwan | Visit site |
| PlanSinn Planung & Kommunikation GmbH | Vienna, Austria | Visit site |
| Planet A Ventures | Pontevedra, Argentina | Visit site |
| Planet Solar Antillas, LLC. | Caguas, Puerto Rico | Visit site |
| Planetary | Dartmouth, Canada | Visit site |
| Plankton PV GmbH | Braunschweig, Germany | Visit site |
| Plataforma Solar de Almería - CIEMAT | Almería, Spain | Visit site |
| Platform Groen Gas | Groningen, Netherlands | Visit site |
| Plejd | Mölndal, Sweden | Visit site |
| Plenti | Sydney, Australia | Visit site |
| Plug The Impact | Coulonces, France | Visit site |
| PluginEnergy | Glatten, Germany | Visit site |
| Pohjan Voima | Espoo, Finland | Visit site |
| Polaris Renewable Energy Inc. | Toronto, Canada | Visit site |
| Polistamp Infissi s.r.l. | Laterina Pergine Valdarno, Italy | Visit site |
| PolyTechAfrica Mechatronic Institute of Technology (PMIT) | Johannesburg, South Africa | Visit site |