| 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.H.R. Hydraulics Limited | Brampton, Canada | Visit site |
| MADEnR | Cergy, France | Visit site |
| MADKOUR | Cairo, Egypt | Visit site |
| MAFI Solar | Färnäs, Sweden | Visit site |
| MAGENTA EKO | Crissier, Switzerland | Visit site |
| MAK Power | United Kingdom | Visit site |
| MAKIINA | Tampere, Finland | Visit site |
| MANERGY | Créteil, France | Visit site |
| MARACOF | Granada, Spain | Visit site |
| MARTIN GmbH für Umwelt- und Energietechnik | München, Germany | Visit site |
| MBMET Meteorology | Kolkata, India | Visit site |
| MCE Automation | Saint-Romain-de-Colbosc, France | Visit site |
| MCi Carbon | Newcastle, Australia | Visit site |
| MD Electrical Construction Renewables Ltd | Dartford, United Kingdom | Visit site |
| MDK Energy | Praha, Czech Republic | Visit site |
| MDS Power Inc. | Montréal, Canada | Visit site |
| MEC SRL | Provaglio d'Iseo, Italy | Visit site |
| MEP Technical Services LTD | Retford, United Kingdom | Visit site |
| MES Energy S.A. | Athina, Greece | Visit site |
| MESOGEOS S.A. | Athina, Greece | Visit site |
| MFZ & Partners | Milano, Italy | Visit site |
| MGD Energy SA | Amarousio, Greece | Visit site |
| MGM Projekt Sp. z o.o. | Katowice, Poland | Visit site |
| MHI Vestas Offshore Wind | Aarhus, Denmark | Visit site |
| MILPLAN Engenharia | Belo Horizonte, Brazil | Visit site |
| MINITRUCKS ROBOTICS | Vénissieux, France | Visit site |
| MINT SA | Montpellier, France | Visit site |
| MIP ENGENHARIA | Belo Horizonte, Brazil | Visit site |
| MKM Building Group | Ballarat, Australia | Visit site |
| MLEI Consulting Engineers | Adelaide, Australia | Visit site |
| MMR Energie | Ranstadt, Germany | Visit site |
| MMSA | Singapore | Visit site |
| MN projects GmbH | Hamburg, Germany | Visit site |
| MNG | Perth, Australia | Visit site |
| MONDRAGON Corporation | Spain | Visit site |
| MOREDAY SOLAR | Ningbo Shi, China | Visit site |
| MOTOMA SOLAR ENERGY CO. LLC | Dongwan Shi, China | Visit site |
| MSCI Carbon Markets | London, United Kingdom | Visit site |
| MSite by Infobric | Liverpool, United Kingdom | Visit site |
| MTC ENERJİ | Çankaya, Türkiye | Visit site |
| MTM Engineering Ltd | Painestown, Ireland | Visit site |
| MULTICOPER SRL | Parre, Italy | Visit site |
| MWA Technology Ltd | Birmingham, United Kingdom | Visit site |
| MYROPES | Olkusz, Poland | Visit site |
| MaRS Discovery District | Toronto, Canada | Visit site |
| Mac Zero Modular Buildings | Dungannon, United Kingdom | Visit site |
| Mace | London, United Kingdom | Visit site |
| Machine Tools Centre | India | Visit site |
| Mack Kirk Industries Ltd | Langley, Canada | Visit site |
| Macquarie Group | Sydney, Australia | Visit site |
| Macrotek Inc. | Markham, Canada | Visit site |
| Magenta Mobility | Navi Mumbai, India | Visit site |
| MagicPower | 新北市, Taiwan | Visit site |
| Magnatic | Bengaluru, India | Visit site |
| Magtel | Córdoba, Spain | Visit site |
| Makintest Teknik Muayene Ölçüm ve Gözetim Hizmetleri | Sancaktepe, Türkiye | Visit site |
| Malaviya Solar Energy Consultancy | Pune, India | Visit site |
| Manawa Energy | Tauranga, New Zealand | Visit site |
| Maodi Solar | Shenzhen Shi, China | Visit site |
| Mapmatic Ltd | Derby, United Kingdom | Visit site |
| Marco Group Limited | St. John's, Canada | Visit site |
| Marimón Abogados | Spain | Visit site |
| Marine Renewables Canada | Halifax, Canada | Visit site |
| Marny Energy | France | Visit site |
| Marti Group | Moosseedorf, Switzerland | Visit site |
| Martin AG für Umwelt- und Energietechnik | Matzingen, Switzerland | Visit site |
| Martínez Quintero Mendoza González Laguado & De La Rosa | Bogotá, Colombia | Visit site |
| Marvel Fusion | München, Germany | Visit site |
| Masader | Environmental and Energy Services | Al Zamalik, Egypt | Visit site |
| Masdar City | Abu Dhabi, United Arab Emirates | Visit site |
| Mashriq Energy | المتن, Lebanon | Visit site |
| Massy Energy Colombia S.A.S. | Bogotá, Colombia | Visit site |
| Mastertech Group | Dublin, Ireland | Visit site |
| Matrix Energia | São Paulo, Brazil | Visit site |
| Matrix Solutions Inc. | Calgary, Canada | Visit site |
| Maulini SA | Satigny, Switzerland | Visit site |
| Maven North East | United Kingdom | Visit site |
| Mavili Elektronik | Ankara, Russia | Visit site |
| Max Power | Jebel Ali, Pakistan | Visit site |
| Maximo Energy | Aguadilla, Puerto Rico | Visit site |
| Maxun Solar Inc. | Ottawa, Canada | Visit site |
| McConnell Dowell | Melbourne, Australia | Visit site |
| McElhanney | Vancouver, Canada | Visit site |
| McKercher Corporation | Perth, Australia | Visit site |
| McLaughlin & Harvey Ltd | Belfast, United Kingdom | Visit site |
| McMillan Vantage | Calgary, Canada | Visit site |
| McTaggart Construction | Dalry, United Kingdom | Visit site |
| Mecasolar | Tres Cantos, Spain | Visit site |
| Medco Power Indonesia | Jakarta, Indonesia | Visit site |
| Meewind | Haarlem, Netherlands | Visit site |
| MegWeld | Bornova, Türkiye | Visit site |
| Meko Metal | Türkiye | Visit site |
| Melasta Battery | Shenzhen Shi, China | Visit site |
| MellowVans | Devon Valley, South Africa | Visit site |
| Menapy | Lede, Belgium | Visit site |
| Meralco PowerGen (MGEN) | Manila, Philippines | Visit site |
| Meta Automação | Sorocaba, Brazil | Visit site |
| MetaBuild | Berlin, Germany | Visit site |
| Metafuels | Zürich, Switzerland | Visit site |
| Metal Frame Renovables | Don Benito, Spain | Visit site |
| Metalforme | Carpi, Italy | Visit site |
| Metalogalva | Trofa, Portugal | Visit site |
| Metastable Materials | Bengaluru, India | Visit site |
| Meteologica | Madrid, Spain | Visit site |
| Metergy Solutions | Unionville, Canada | Visit site |
| Methagora | Villeurbanne, France | Visit site |
| Methania | Anderlecht, Belgium | Visit site |
| Miba Group | Laakirchen, Austria | Visit site |
| Michielsens | Belgium | Visit site |
| Microgrid Solutions | Hengelo, Netherlands | Visit site |
| Midmac Contracting Company W.L.L. | Doha, Qatar | Visit site |
| Mighty Avengers Pvt. Ltd. | Gurugram, India | · |
| Mijn Energiefabriek | Hardenberg, Netherlands | Visit site |
| Mile Solar | Main Street, Uganda | Visit site |
| Milkyway Chemical Logistics | Shanghai, China | Visit site |
| Milliot Green by Reno·Energy | Iwuy, France | Visit site |
| Milpes Elektronik | Ankara, Türkiye | Visit site |
| Mincon | Ireland | Visit site |
| Mindaro | Sydney, Australia | Visit site |
| Mindtech Energy | Shenzhen Shi, China | Visit site |
| Ministry of New and Renewable Energy (MNRE) | New Delhi, India | Visit site |
| Ministry of Solar | Ruiselede, Belgium | Visit site |
| Minnow Environmental, a Trinity Consultants Canada Team | Georgetown, Canada | Visit site |
| Mirova | Paris, France | Visit site |
| Mirsee Robotics Inc. | Cambridge, Canada | Visit site |
| Mirsolar Enerji | Adapazarı, Türkiye | Visit site |
| Mission Critical | Wrocław, Poland | Visit site |
| Mission Zero | Leipzig, Germany | Visit site |
| Mister Shade Me | Sharjah, United Arab Emirates | Visit site |
| Mitrex | Etobicoke, Canada | Visit site |
| Moja elektrarna d.o.o. | Maribor, Slovenia | Visit site |
| Mokun Renewable | Jamshedpur, India | Visit site |
| Molyon | Cambridge, United Kingdom | Visit site |
| Monford Group | Perth, Australia | Visit site |
| Montavent | Zürich, Switzerland | Visit site |
| Montelec photovoltaïque | France | Visit site |
| Morel Energy | Bidart, France | Visit site |
| Mostostal Zabrze Realizacje Przemysłowe S.A. | Częstochowa, Germany | Visit site |
| Mota-Engil Energia | Ramada, Portugal | Visit site |
| Mounting Solar-Kit Private Limited | Mumbai, India | Visit site |
| Muehlhan Wind Service | Fredericia, Denmark | Visit site |
| Multipipe Ltd | Chelmsford, United Kingdom | Visit site |
| Multiva | Mexico City, Mexico | Visit site |
| Mundo Solar Energy | Ponce, Puerto Rico | Visit site |
| Munich Re | · | Visit site |
| Munich Solar | Essenbach, Germany | Visit site |
| MunmuBaram | Busan, South Korea | Visit site |