| Lilac Technologies | Abuja Municipal, Nigeria | Visit site |
| Limak Group of Companies | Çankaya, Türkiye | Visit site |
| Limejump | London, United Kingdom | · |
| Limhamn Solar | Limhamn, Sweden | · |
| Linea Trovata Group | Lokeren, Belgium | Visit site |
| Linea Trovata Group | Kontich, Belgium | Visit site |
| Lingtech Solar | China | Visit site |
| Linka Energy A/S | Lem St, Denmark | · |
| 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 | Den Haag, Netherlands | Visit site |
| Lion Storage | Coulsdon, United Kingdom | Visit site |
| Lippe Solar GmbH | Geseke, Germany | Visit site |
| Lipu Metal | Suzhou Shi, China | Visit site |
| Liquid Wind | Göteborg, Sweden | Visit site |
| Lisun Power | Shenzhen Shi, China | Visit site |
| Lith-On | Ghaziabad, India | Visit site |
| Lithion Technologies | Anjou, Canada | · |
| Lithium Valley | China | Visit site |
| Lithium Werks | Enschede, Netherlands | Visit site |
| Lithum Energia Solar WEG | Joinville, Brazil | Visit site |
| Little Sun | Lusaka, Zambia | Visit site |
| Live Energy | Şahinbey, Türkiye | · |
| Livium Ltd | Melbourne, Australia | Visit site |
| Livoltek Power | Hangzhou Shi, China | Visit site |
| Livoltek Sénégal | Dakar, Senegal | · |
| Liyuan Battery | Shenzhen Shi, China | Visit site |
| Lloreda Camacho & Co | Bogotá, Colombia | Visit site |
| Lloreda Camacho & Co | Sopó, Colombia | Visit site |
| Lobster Robotics | Delft, Netherlands | Visit site |
| Lodestone Energy | Auckland, New Zealand | Visit site |
| Logan Energy Limited | Musselburgh, United Kingdom | Visit site |
| London Array Limited | Ramsgate, United Kingdom | Visit site |
| London Court of International Arbitration (LCIA) | London, United Kingdom | Visit site |
| Lone Lighthouse | Madrid, Spain | Visit site |
| Longspur Capital | London, United Kingdom | Visit site |
| Longyin Photovoltaic | Jiaxing Shi, China | Visit site |
| Loop Energy Inc. | Burnaby, Canada | · |
| LoopGate | Al-Riyadh, Saudi Arabia | Visit site |
| Lorenz-Montagesysteme | Frechen, Germany | Visit site |
| Lovato Electric | Gorle, Italy | · |
| Low Carbon Energy | Burnley, United Kingdom | Visit site |
| Low Energy Services Ltd | Glasgow, United Kingdom | Visit site |
| Lu'an Solar | Changzhi Shi, China | Visit site |
| Lucid Consulting Australia | Adelaide, Australia | Visit site |
| Lufft | Fellbach, Germany | Visit site |
| LumenHaus GmbH | Düsseldorf, Germany | · |
| Lumera Solar Inc. | Surrey, Canada | Visit site |
| Luminous Energy Consultancy | Abu Dhabi, United Arab Emirates | Visit site |
| Luminous Energy Group Ltd | Corsham, United Kingdom | Visit site |
| Luminous Power Technologies | Gurugram, India | Visit site |
| Luminova Energy | Prilly, Switzerland | · |
| Luminus | Saint-Josse-ten-Noode, Belgium | Visit site |
| Lumx Energy | Douala, Cameroon | Visit site |
| Lundsby Renewable Solutions A/S | Løgstrup, Denmark | Visit site |
| Lundsby Renewable Solutions A/S | Middelfart, Denmark | Visit site |
| Luntstone | Flint, United Kingdom | Visit site |
| Lupix Energy | Hannover, Germany | Visit site |
| Lux Optimeyes Energy Lda | Moura, Portugal | Visit site |
| LuxChemtech GmbH | Freiberg, Germany | Visit site |
| LuxChemtech GmbH | Tangermünde, Germany | Visit site |
| Luxen Solar Energy | Nantong Shi, China | Visit site |
| Luz Verde | Lousada, Portugal | Visit site |
| Lylux | Dubai, United Arab Emirates | Visit site |
| Lynac | Thunder Bay, Canada | Visit site |
| Lyric Automation Germany GmbH | Hamburg, Germany | Visit site |
| Lyric Automation Germany GmbH | Langenhagen, Germany | Visit site |
| Lyric Robot | China | Visit site |
| Lysaker & Thorrud AS | Mjøndalen, Norway | Visit site |
| Lyse | Stavanger, Norway | Visit site |
| Lyv Energy Management Solutions | Blaricum, Netherlands | · |
| Lİ-ON Enerji | Çankaya, Türkiye | Visit site |
| M&A Design Engineering | Mougins, France | Visit site |
| M&G | London, United Kingdom | Visit site |
| M&P Mechanical | Dundrum, Ireland | Visit site |
| M&P Mechanical | Castlebellingham, Ireland | Visit site |
| M&P Mechanical | Belfast, United Kingdom | Visit site |
| M+B Electrical Consulting Engineers | Calgary, Canada | Visit site |
| M+F Technologies GmbH | Hamburg, Germany | Visit site |
| M+W Group | Stuttgart, Germany | Visit site |
| M-TEC | Pinsdorf, Austria | Visit site |
| M.H.R. Hydraulics Limited | Brampton, Canada | Visit site |
| MADEnR | Honfleur, France | Visit site |
| MADEnR | Pusignan, France | Visit site |
| MADEnR | Cergy, France | Visit site |
| MADKOUR | Cairo, Egypt | Visit site |
| MAFI Solar | Färnäs, Sweden | Visit site |
| MAG Solar | Mission, Canada | Visit site |
| MAGENTA EKO | Crissier, Switzerland | Visit site |
| MAINLINE DIGITAL PVT LTD | Lahore, Pakistan | Visit site |
| MAISVENTO | As Pontes de García Rodríguez, Spain | · |
| MAK Power | Newcastle, United Kingdom | Visit site |
| MAK Power | United Kingdom | Visit site |
| MAKIINA | Tampere, Finland | Visit site |
| MANERGY | Créteil, France | Visit site |
| MANLY Battery | Shenzhen Shi, China | · |
| MARACOF | Granada, Spain | Visit site |
| MARCLEY | Hannover, Germany | Visit site |
| MARTIN GmbH für Umwelt- und Energietechnik | München, Germany | Visit site |
| MARWIND Energias Renováveis | Salvador, Brazil | Visit site |
| MASHREQ For Energy Systems | Cairo, Egypt | Visit site |
| MASNORTE | Llanera, Spain | Visit site |
| MAT 4Site Engineers Limited | Toronto, Canada | Visit site |
| MATRIX ENERGY SYSTEMS LTD | Rotherham, United Kingdom | Visit site |
| MATgrow Renewables Pvt. Ltd. | Ahmedabad, India | Visit site |
| MAWERA GmbH | Hard, Austria | · |
| MAXX SOLAR & ENERGIE GmbH & Co. KG | Waltershausen, Germany | Visit site |
| MBMET Meteorology | Kolkata, India | Visit site |
| MCA Battery | Fuoshan Shi, China | · |
| MCE Automation | Saint-Romain-de-Colbosc, France | Visit site |
| MCL Group LLC | Kyiv, Ukraine | Visit site |
| MCW Group of Companies | Toronto, Canada | Visit site |
| MCi Carbon | Newcastle, Australia | Visit site |
| MD Electrical Construction Renewables Ltd | Dartford, United Kingdom | Visit site |
| MD Electrical Construction Renewables Ltd | Swanscombe, United Kingdom | Visit site |
| MD Engineers | Mangrol, India | · |
| MDI Solar - instalacje fotowoltaiczne | Warszawa, Poland | · |
| MDK Energy | Praha, Czech Republic | Visit site |
| MDS Power Inc. | Montréal, Canada | Visit site |
| MDWind | Weiswampach, Luxembourg | Visit site |
| MEASWIND RENEWABLE SERVICES S.L | Cariñena, Spain | Visit site |
| MEC SRL | Provaglio d'Iseo, Italy | Visit site |
| MECC | Torri di Quartesolo, Italy | Visit site |
| MEINE Electric | Chennai, India | Visit site |
| MEP Technical Services LTD | Retford, United Kingdom | Visit site |
| MERKUR Offshore GmbH | Hamburg, Germany | Visit site |
| MES Energy S.A. | Athina, Greece | Visit site |
| MESOGEOS S.A. | Athina, Greece | Visit site |
| MEXTYPSA | Mexico City, Mexico | Visit site |
| MFZ & Partners | Milano, Italy | Visit site |
| MG Energy Systems | Leeuwarden, Netherlands | Visit site |
| MG Sustainable Engineering | Uppsala, Sweden | · |
| MGA Thermal | Tomago, Australia | · |
| MGD Energy SA | Amarousio, Greece | Visit site |
| MGK Tech | Rethymno, Greece | · |
| MGM Projekt Sp. z o.o. | Katowice, Poland | Visit site |
| MHB | Herveld, Netherlands | · |
| MHI Vestas Offshore Wind | Aarhus, Denmark | Visit site |
| MICCTech | Shenzhen Shi, China | · |
| MILPLAN Engenharia | Belo Horizonte, Brazil | Visit site |
| MILPLAN Engenharia | São Paulo, Brazil | Visit site |
| MINE STORAGE | Stockholm, Sweden | Visit site |
| MINITRUCKS ROBOTICS | Vénissieux, France | Visit site |
| MINT SA | Montpellier, France | Visit site |
| MIP ENGENHARIA | Belo Horizonte, Brazil | Visit site |
| MIPV | Newport, United Kingdom | Visit site |
| MIRAI Power | Laval, Canada | Visit site |
| MIRECK - Metal Industry and Renewable Energy Cluster of Kosovo | Pristina, Kosovo | Visit site |