| Jernforsen Energy AB | Halmstad, Sweden | · |
| Jet Energy | Rabat, Morocco | · |
| Jet Zero | Sydney, Australia | Visit site |
| JetSolar | Oseem, Egypt | Visit site |
| Jiajiu Energy Technology | China | Visit site |
| Jiangsu Davinsolar Aluminium Technology Co., Ltd | Wuxi Shi, China | Visit site |
| Jiangsu Gomon New Energy Co.,Ltd | Taizhou Shi, China | Visit site |
| Jiangsu Mario New Energy Co.,Ltd | Nanjing Shi, China | Visit site |
| Jiangsu Yawei Transformer Co., Ltd | China | Visit site |
| Jiansheng Lighting | Shenzhen Shi, China | Visit site |
| Jieao Energy | Shenzhen Shi, China | Visit site |
| Jietai Solar | Suzhou Shi, China | · |
| Jieyang New Energy | Dezhou Shi, China | Visit site |
| Jimmy | Paris, France | Visit site |
| Jindal India Renewable Energy | New Delhi, India | Visit site |
| JinenU Solar | Taizhou Shi, China | Visit site |
| Jinergy | Jingzhong Shi, China | Visit site |
| Jingdao New Energy | Qingdao Shi, China | Visit site |
| Jingxin Science and Technology | Tangshan Shi, China | Visit site |
| Jingxin Solar | Tangshan Shi, China | Visit site |
| JinkoCn | Shenzhen Shi, China | Visit site |
| Jinlida Electrical | China | · |
| Jinpei Electronics | Bamangola, India | Visit site |
| Jinrun Electronics Co., Ltd. | China | Visit site |
| Jinyou Jinhong | Shanghai, China | Visit site |
| Jinyuan Solar | China | Visit site |
| Jiro-Ve | Antananarivo, Madagascar | Visit site |
| JnTech | Hefei Shi, China | Visit site |
| John Cullen Lighting | London, United Kingdom | Visit site |
| John Laing | London, United Kingdom | Visit site |
| John Sisk & Son Ltd | Tallaght, Ireland | Visit site |
| Johnray Solar | Suzhou Shi, China | Visit site |
| Joju Solar | London, United Kingdom | Visit site |
| Jolt Energy | München, Germany | · |
| Jolta Technology DMCC | Dubai, United Arab Emirates | Visit site |
| Jolywood EU | Montecchio Maggiore, Italy | Visit site |
| Jones Engineering | Dublin, Ireland | Visit site |
| Jonsol | Aidlingen, Germany | · |
| Joseph Engineering Services | Dubai, United Arab Emirates | Visit site |
| Joule Group | London, United Kingdom | Visit site |
| Joule Group | Manchester, United Kingdom | Visit site |
| Joule Group | Sheffield, United Kingdom | Visit site |
| Joule Group | Belfast, United Kingdom | Visit site |
| Joule Group | Derry, Ireland | Visit site |
| Joule Group | Dubai, United Arab Emirates | Visit site |
| Joulebank | Shenzhen Shi, China | Visit site |
| Joypo Energy | Changsha Shi, China | · |
| Jubaili Bros Solar | Jebel Ali, United Arab Emirates | · |
| Juniper Green Energy | Gurugram, India | Visit site |
| Junna Solar | Hyderabad, India | Visit site |
| Junno Energy | Hangzhou Shi, China | Visit site |
| Jupiter International Limited | Kolkata, India | Visit site |
| Jupiter International Limited | Baddi, India | Visit site |
| Jurchen Technology GmbH | Helmstadt, Germany | Visit site |
| Jurchen Technology India Pvt. Ltd. | Mumbai, India | · |
| Jurong Engineering Limited | Singapore, Singapore | Visit site |
| Just Electrical Appliances | Jinhua Shi, China | · |
| Juxin Energy | Wuxi Shi, China | Visit site |
| K-Electric | Karachi, Pakistan | Visit site |
| K. LIAROMATIS S.A. | Agios Stefanos, Greece | Visit site |
| K. LIAROMATIS S.A. | Patra, Greece | Visit site |
| K. LIAROMATIS S.A. | Amarousio, Greece | Visit site |
| K2 Systems GmbH | Renningen, Germany | · |
| K2 Systems MX | Guadalajara, Mexico | Visit site |
| KACO | Neckarsulm, Germany | Visit site |
| KAISAI | Warszawa, Poland | Visit site |
| KALPATARU POWER TRANSMISSION LIMITED | Mumbai, India | Visit site |
| KALPATARU PROJECTS INTERNATIONAL LIMITED | Mumbai, India | Visit site |
| KAM | Mexico City, Mexico | Visit site |
| KAMATI LTDA. BIC. | Yumbo, Colombia | Visit site |
| KAMATI LTDA. BIC. | Bogotá, Colombia | Visit site |
| KASKA solar | České Budějovice, Czech Republic | Visit site |
| KB Development srl | San Zeno Naviglio, Italy | Visit site |
| KB Development srl | Poncarale, Italy | Visit site |
| KB Development srl | Civitanova Marche, Italy | Visit site |
| KC8 Capture Technologies | Melbourne, Australia | · |
| KEC International Ltd. | Mumbai, India | Visit site |
| KEI Wires and Cables | New Delhi, India | Visit site |
| KEI Wires and Cables | Silvassa, India | Visit site |
| KEMA Labs | Milano, Italy | Visit site |
| KEMA Labs | Arnhem, Netherlands | Visit site |
| KEMA Labs | Berlin, Germany | Visit site |
| KEMA Labs | Mannheim, Germany | Visit site |
| KEMA Labs | York, United Kingdom | Visit site |
| KEMA Labs | Praha, Czech Republic | Visit site |
| KEME ENERGY | Penhascoso, Portugal | · |
| KERSTEN | Wanssum, Netherlands | Visit site |
| KEY - The Energy Transition Expo | Savignano sul Rubicone, Italy | · |
| KGAL GmbH & Co. KG (KGAL) | Grünwald, Germany | Visit site |
| KHIMOD | Paris, France | Visit site |
| KIEFER | Amarousio, Greece | Visit site |
| KIENLE Beratende Ingenieure GmbH | Ostrach, Germany | Visit site |
| KIENLE Beratende Ingenieure GmbH | Stuttgart, Germany | Visit site |
| KIENLE Beratende Ingenieure GmbH | Waldshut-Tiengen, Germany | Visit site |
| KIENLE Beratende Ingenieure GmbH | Konstanz, Germany | Visit site |
| KIENLE Beratende Ingenieure GmbH | Ulm, Germany | Visit site |
| KIMSEN Aluminum | Yên Phong, Vietnam | Visit site |
| KIN HOMES | New Plymouth, New Zealand | Visit site |
| KIN HOMES | New Zealand | Visit site |
| KIS Group-Sustainability² | Bengaluru, India | Visit site |
| KISTERS HydroMet | Aachen, Germany | Visit site |
| KJTS Group Berhad | Kuala Lumpur, Malaysia | Visit site |
| KK Group | Ikast, Denmark | Visit site |
| KK Wind Solutions | Ikast, Denmark | Visit site |
| KLAAFE Engineering Services | Hull, United Kingdom | Visit site |
| KMT GmbH | München, Germany | Visit site |
| KMT GmbH | Butzbach, Germany | Visit site |
| KMW | Hwaseong-si, South Korea | Visit site |
| KNOX | Dwarka, India | Visit site |
| KOC Energy | Üsküdar, Türkiye | Visit site |
| KOCO Energy AG | Rimsting, Germany | Visit site |
| KOLIN Construction | Çankaya, Türkiye | Visit site |
| KOLIN Construction | Türkiye | Visit site |
| KOLIN Construction | Azerbaijan | Visit site |
| KOLIN Construction | Libya | Visit site |
| KOLIN Construction | Poland | Visit site |
| KOLIN Construction | Romania | Visit site |
| KOLIN Construction | Oman | Visit site |
| KOLIN Construction | Saudi Arabia | Visit site |
| KOLIN Construction | Kuwait | Visit site |
| KOLYA PNE | Albacete, Spain | · |
| KONTEK ENERJİ | Bornova, Türkiye | · |
| KONTROLX Periyodik Kontrol Muayene Hizmetleri | Istanbul, Türkiye | Visit site |
| KONTROLX Periyodik Kontrol Muayene Hizmetleri | Bayrampaşa, Türkiye | Visit site |
| KOOPMANN Gruppe | Cloppenburg, Germany | Visit site |
| KOTSONS | Ramgarh, India | Visit site |
| KOTSONS | Alwar, India | Visit site |
| KP Electric Co., Ltd | · | Visit site |
| KP Energy | Västerås, Sweden | Visit site |
| KP Group | India | Visit site |
| KP Solar Group | Костинброд, Bulgaria | Visit site |
| KPMG España | Madrid, Spain | Visit site |
| KPV Solar GmbH | Klagenfurt am Wörthersee, Austria | Visit site |
| KRAFTBLOCK | Sulzbach, Germany | Visit site |
| KRAFTWERK Renewable Power Solutions | Weingarten, Germany | Visit site |
| KROMO ENGENHARIA | São José do Belmonte, Brazil | · |
| KRONOTERM | Braslovče, Slovenia | Visit site |
| KReco | Zhongshan Shi, China | · |
| KSBS SOLAR | Chennai, India | Visit site |
| KSTAR New Energy | Shenzhen Shi, China | · |
| KT-Electronic | Roma, Italy | Visit site |
| KTH Innovation | Stockholm, Sweden | Visit site |
| KTenergy | Shenzhen Shi, China | Visit site |
| KUAZAR ENERJİ | Pursaklar, Türkiye | Visit site |
| KWB GmbH | St. Margarethen an der Raab, Austria | Visit site |
| KWE Kälte-Technik | Frankenhardt, Germany | Visit site |
| KWG Energy | Dubai, United Arab Emirates | Visit site |
| KWHIQ | Rosmalen, Netherlands | Visit site |
| KWpeak Solutions GmbH | Guxhagen, Germany | Visit site |
| KYRA PHOTON TECH PVT LTD | Chennai, India | Visit site |