| KMT GmbH | Butzbach, Germany | Visit site |
| KOC Energy | Üsküdar, Türkiye | Visit site |
| KOLIN Construction | Azerbaijan | Visit site |
| KONTROLX Periyodik Kontrol Muayene Hizmetleri | Bayrampaşa, Türkiye | Visit site |
| KOOPMANN Gruppe | Cloppenburg, Germany | Visit site |
| KOTSONS | Alwar, India | Visit site |
| KPMG España | Madrid, Spain | Visit site |
| KT-Electronic | Roma, Italy | Visit site |
| KTH Innovation | Stockholm, Sweden | Visit site |
| KWHIQ | Rosmalen, Netherlands | Visit site |
| KYRA PHOTON TECH PVT LTD | Chennai, India | Visit site |
| Kaizen Design Solutions Pvt. Ltd | Mumbai, India | Visit site |
| Kalyon Construction Group | Üsküdar, Türkiye | Visit site |
| Kalyoncu Enerji San. ve Tic. Ltd. Şti. | Ortahisar, Türkiye | Visit site |
| Kalzip | Koblenz, Germany | Visit site |
| Kameleon Solar | Roosendaal, Netherlands | Visit site |
| Kanadevia Inova | Zürich, Switzerland | Visit site |
| Kantor Management Consultants | Athina, Belgium | Visit site |
| Kapitein BV | Cruquius, Netherlands | Visit site |
| Kapture | Melbourne, Australia | Visit site |
| Karvy Technologies | Mumbai, India | Visit site |
| Katowice City - live, work & invest | Katowice, Poland | Visit site |
| Kayser GmbH | Weißenburg in Bayern, Germany | Visit site |
| Kedma Solar - קדמה סולארי | Holon, Israel | Visit site |
| Kemexon | Dubai, Belgium | Visit site |
| Kenny Solar | Perth, Australia | Visit site |
| Kermi Raumklima | Plattling, Germany | Visit site |
| Kerrigan Mechanical Ltd. | Athboy, Ireland | Visit site |
| Kesir | Dilovası, Türkiye | Visit site |
| Kewo Electric Technology Co.,Ltd | China | Visit site |
| Keymex Energy | León, Mexico | Visit site |
| Kier Group | Ramsgate, United Kingdom | Visit site |
| Kilimo | Córdoba, Argentina | Visit site |
| KiloLima | Maadi, Egypt | Visit site |
| Kingspan Insulated Panels UK & Ireland | Holywell, United Kingdom | Visit site |
| Kingspan Isoeste | Goiás, Brazil | Visit site |
| Kingston Process Metallurgy Inc. (KPM) | Kingston, Canada | Visit site |
| Kinsend Metal | China | Visit site |
| Kirby Building Systems - A group company of Alghanim Industries | Canada | Visit site |
| Kiwa | Rijswijk, Netherlands | Visit site |
| Klas Kablo | Şahinbey, Türkiye | Visit site |
| Klaus Faber | Saarbrücken, Germany | Visit site |
| Klinger und Partner GmbH | Stuttgart, Germany | Visit site |
| Klohn Crippen Berger | Vancouver, Canada | Visit site |
| Koehler Energy Group | Dundee, Germany | Visit site |
| Koloğlu Holding | Çankaya, Türkiye | Visit site |
| Korax Solar | Ráckeve, Hungary | Visit site |
| Koubaras Ltd | Athina, Greece | Visit site |
| Koło Naukowe Nova Energia | Kraków, Poland | Visit site |
| Kraftfeld Energy | Vienna, Austria | Visit site |
| Kraftringen | Lund, Sweden | Visit site |
| Kreutzpointner Unternehmensgruppe | Burghausen, Germany | Visit site |
| Kronos Solar - EDPR | München, Germany | Visit site |
| Kudura Power East Africa Ltd | Анцух, Russia | Visit site |
| Kverneland Energi | Klepp Stasjon, Norway | Visit site |
| Kylemore Capital | London, United Kingdom | Visit site |
| Kyocera | 京都市, Japan | Visit site |
| Kyoto Fusioneering | 東京都, Japan | Visit site |
| L&T Construction | Chennai, India | Visit site |
| L&T Finance | Mumbai, India | Visit site |
| L&T Technology Services | Vadodara, India | Visit site |
| LAPP India | Germany | Visit site |
| LCB - groupe Face | Parigné-l'Évêque, France | Visit site |
| LCP Delta | London, United Kingdom | Visit site |
| LDK Consultants | Athina, Greece | Visit site |
| LED Industries, Inc. | · | Visit site |
| LEDI ÉTANCHÉITÉ | Lyon, France | Visit site |
| LG Solar Global | Seoul, South Korea | Visit site |
| LG Water Solutions | Seoul, South Korea | Visit site |
| LI JIN INDUSTRIAL CO LTD 立津國際 | 臺中市, Taiwan | Visit site |
| LIDELA - light design laboratory | Stuttgart, Germany | Visit site |
| LIFEPOWR | Antwerpen, Belgium | Visit site |
| LIGHTWORKS SERVICES LTD | Walsall, United Kingdom | Visit site |
| LILAN ENERGY | Bogotá, Colombia | Visit site |
| LIXIL | 東京都, Japan | Visit site |
| LS Cable & System | Anyang-si, South Korea | Visit site |
| LSES-Lebanese Solar Energy Society | بيروت, Lebanon | Visit site |
| La Caisse (Caisse de dépôt et placement du Québec) | Montréal, Canada | Visit site |
| Lahmeyer International GmbH | Bad Vilbel, Germany | Visit site |
| Laing O'Rourke | Dartford, United Kingdom | Visit site |
| Lakestar | Berlin, Germany | Visit site |
| Laketricity | Bordeaux, France | Visit site |
| Landatu Solar SL | Bilbao, Spain | Visit site |
| Landsvirkjun | Reykjavík, Iceland | Visit site |
| Larsen & Toubro Limited | Mumbai, India | Visit site |
| Laser Surveys Ltd | Ingatestone, United Kingdom | Visit site |
| Laska Technology | Beşiktaş, Türkiye | Visit site |
| LayTec | Berlin, Germany | Visit site |
| Leaf Ingénierie | Boulogne-Billancourt, France | Visit site |
| Leapton Solar | 泉南郡, Japan | Visit site |
| Ledcor | Vancouver, Canada | Visit site |
| Ledermüller - Energie Optimiert | Vorderweißenbach, Austria | Visit site |
| Leeka Corp. | Changzhou Shi, China | Visit site |
| Lees Power | Wuxi Shi, China | Visit site |
| Legal & General | London, United Kingdom | Visit site |
| Legendre | Saint-Jacques-de-la-Lande, France | Visit site |
| Leibniz-Institut für Photonische Technologien | Jena, Germany | Visit site |
| Lener Asesores legales y económicos | Madrid, Spain | Visit site |
| Lenergy SpA | Calcinaia, Italy | Visit site |
| Leo Group Ltd | Halifax, United Kingdom | Visit site |
| Leon Solar | Barrackpore, India | Visit site |
| Lesso New Energy | Fuoshan Shi, China | Visit site |
| Level Consulting Engineers Ltd. | Calgary, Canada | Visit site |
| Levidian | Cambridge, United Kingdom | Visit site |
| Levin Solar | Xiamen Shi, China | Visit site |
| LeydenJar | Eindhoven, Netherlands | Visit site |
| Leyton | France | Visit site |
| Li-S Energy | Brisbane, Australia | Visit site |
| Liaoning Zlion Energy Co., Ltd. | China | Visit site |
| Licht Project | Halle, Germany | Visit site |
| LichtBlick SE | Hamburg, Germany | Visit site |
| Licovolt | Howth, Ireland | Visit site |
| Light Link | Dubai, United Arab Emirates | Visit site |
| Light Up The World (LUTW) | Calgary, Canada | Visit site |
| Lightenco | Ottawa, Canada | Visit site |
| Lighting & Electrical Distributors | Melbourne, Australia | Visit site |
| Lighting Design Magazine | Athina, Greece | Visit site |
| Lightrock Power | Sheffield, United Kingdom | Visit site |
| Lilac Technologies | Abuja Municipal, Nigeria | Visit site |
| Limak Group of Companies | Çankaya, Türkiye | Visit site |
| Linea Trovata Group | Kontich, Belgium | Visit site |
| Linko Solar (Xiamen) Technology | Xiamen Shi, China | Visit site |
| Lintas GmbH | Oldenburg, Germany | Visit site |
| Lintas Green Energy | Oldenburg, Germany | Visit site |
| Lion Environmental | Warszawa, Poland | Visit site |
| Lion Storage | Coulsdon, Netherlands | Visit site |
| Lipu Metal | Suzhou Shi, China | Visit site |
| Liquid Wind | Göteborg, Sweden | Visit site |
| Lithum Energia Solar WEG | Joinville, Brazil | Visit site |
| Livium Ltd | Melbourne, Australia | Visit site |
| Lloreda Camacho & Co | Bogotá, Colombia | Visit site |
| Lobster Robotics | Delft, Netherlands | Visit site |
| London Court of International Arbitration (LCIA) | London, United Kingdom | Visit site |
| Longspur Capital | London, United Kingdom | Visit site |
| Lorenz-Montagesysteme | Frechen, Germany | Visit site |
| Lucid Consulting Australia | Adelaide, Australia | Visit site |
| Lufft | Fellbach, Germany | Visit site |
| Luminous Energy Consultancy | Abu Dhabi, United Arab Emirates | Visit site |
| Luminous Power Technologies | Gurugram, India | Visit site |
| Luminus | Saint-Josse-ten-Noode, Belgium | Visit site |
| Lundsby Renewable Solutions A/S | Løgstrup, Denmark | Visit site |
| Lupix Energy | Hannover, Germany | Visit site |
| LuxChemtech GmbH | Freiberg, Germany | Visit site |
| Lylux | Dubai, United Arab Emirates | Visit site |
| Lyric Automation Germany GmbH | Hamburg, Germany | Visit site |
| Lyric Robot | China | Visit site |
| Lysaker & Thorrud AS | Mjøndalen, Norway | Visit site |
| M&A Design Engineering | Mougins, France | Visit site |
| M&G | London, United Kingdom | Visit site |
| M&P Mechanical | Belfast, Ireland | Visit site |