| Martínez Quintero Mendoza González Laguado & De La Rosa | Bogotá, Bogotá | Visit site |
| Marvel Fusion | München, Bavaria | Visit site |
| Maryland Community Solar | Columbia, Maryland | Visit site |
| MasTec | Coral Gables, Florida | Visit site |
| Masader | Environmental and Energy Services | Al Zamalik, Cairo | Visit site |
| Masdar City | Abu Dhabi, Abu Dhabi | Visit site |
| Masfab Technology | · | · |
| Mashriq Energy | المتن, Mount Lebanon | Visit site |
| Mass. Electric Construction Co. | Waltham, Massachusetts | Visit site |
| Massachusetts Clean Energy Center | Boston, Massachusetts | Visit site |
| Massachusetts Executive Office of Energy and Environmental Affairs | Boston, Massachusetts | Visit site |
| Massy Energy Colombia S.A.S. | Bogotá, Bogotá | Visit site |
| Mastertech Group | Tallaght, County Dublin | Visit site |
| Matenaer | West Bend, Wisconsin | Visit site |
| Matrix Energia | São Paulo, São Paulo | Visit site |
| Matrix Solutions Inc. | Calgary, Alberta | Visit site |
| Maulini SA | Satigny, Geneva | Visit site |
| Maven North East | Newcastle upon Tyne, England | Visit site |
| Maverick Power | McKinney, Texas | Visit site |
| Mavili Elektronik | Pendik, Istanbul | Visit site |
| Max Power | Jebel Ali, Dubai | Visit site |
| MaxAmps Lithium Batteries | Spokane, Washington | Visit site |
| Maxeon Solar Technologies | Singapore, Central Singapore Community Development Council | Visit site |
| Maxim Integrated | San Jose, California | Visit site |
| Maxima Solar | Dubai, Dubai | Visit site |
| Maximo Energy | Aguadilla, Puerto Rico | Visit site |
| Maxun Solar Inc. | Ottawa, Ontario | Visit site |
| McCalmont Engineering | Campbell, California | Visit site |
| McCarthy Building Companies, Inc. | St. Louis, Missouri | Visit site |
| McConnell Dowell | Melbourne, Victoria | Visit site |
| McDermott International, Ltd | Houston, Texas | Visit site |
| McElhanney | Vancouver, British Columbia | Visit site |
| McGrath Electric, Inc. | Fairfield, California | Visit site |
| McKenney's, Inc. | Atlanta, Georgia | Visit site |
| McKercher Corporation | Perth, Western Australia | Visit site |
| McKinsey & Company | · | Visit site |
| McKinstry | Seattle, Washington | Visit site |
| McLaughlin & Harvey Ltd | Newtownabbey, Northern Ireland | Visit site |
| McMillan Electric | San Francisco, California | Visit site |
| McMillan Vantage | Ottawa, Ontario | Visit site |
| McParlane & Associates, Inc. | San Diego, California | Visit site |
| McTaggart Construction | Dalry, Scotland | Visit site |
| Mead & Hunt | Middleton, Wisconsin | Visit site |
| Mecasolar | Tres Cantos, Madrid | Visit site |
| Mechanical Contractors Association of America (MCAA) | Rockville, Maryland | Visit site |
| Mechanical Contractors Association of Chicago | Burr Ridge, Illinois | Visit site |
| Meco of Atlanta Inc | Doraville, Georgia | Visit site |
| Mecosun | Ho Chi Minh City, Ho Chi Minh City | Visit site |
| Medco Power Indonesia | Jakarta, Jakarta | Visit site |
| Meewind | Haarlem, North Holland | Visit site |
| MegWeld | Bornova, İzmir | Visit site |
| Megger | Dover, England | Visit site |
| Megha Engineering and Infrastructures Ltd (MEIL) | Hyderabad, Telangana | Visit site |
| Meglio and Associates | Chesterfield, Missouri | Visit site |
| Meko Metal | Kocaeli | Visit site |
| Melasta Battery | Shenzhen Shi, Guangdong | Visit site |
| MellowVans | Stellenbosch, Western Cape | Visit site |
| Menapy | Lede, East Flanders | Visit site |
| Meralco PowerGen (MGEN) | Manila, Manila | Visit site |
| Mercer Zimmerman | Overland Park, Kansas | Visit site |
| Meridian Economics (Pty)Ltd | Cape Town, Western Cape | Visit site |
| Merit Controls | Somerville, New Jersey | Visit site |
| Merit SI | Houston, Texas | Visit site |
| Meta Automação | Sorocaba, São Paulo | Visit site |
| Meta Power Solutions | North Palm Beach, Florida | Visit site |
| MetaBuild | Berlin, Berlin | Visit site |
| Metafuels | Zürich, Zürich | Visit site |
| Metal Frame Renovables | Don Benito, Badajoz | Visit site |
| Metalforme | Carpi, Modena | Visit site |
| Metalogalva | Trofa, Porto | Visit site |
| Metastable Materials | Bengaluru, Karnataka | Visit site |
| Metem | Parsippany, New Jersey | Visit site |
| Meteologica | Madrid, Madrid | Visit site |
| Meteomatics | St. Gallen, St. Gallen | Visit site |
| Metergy Solutions | Unionville, Ontario | Visit site |
| Methagora | Villeurbanne, Rhône | Visit site |
| Methania | Anderlecht, Brussels-Capital | Visit site |
| Metrus Energy | San Francisco, California | Visit site |
| Miba Group | Laakirchen, Upper Austria | Visit site |
| Michels Corporation | Brownsville, Wisconsin | Visit site |
| Michielsens | Lier, Antwerp | Visit site |
| Michigan Clean Cities | Detroit, Michigan | Visit site |
| Micro Hydroelectric Solutions LLC | Alexandria, Virginia | Visit site |
| Microchip Technology Inc. | Chandler, Arizona | Visit site |
| Microgrid Accelerator Inc. | Dallas, Texas | Visit site |
| Microgrid Solutions | Hengelo, Overijssel | Visit site |
| Micross Components | Apopka, Florida | Visit site |
| Mid-America Solar | Marshall, Michigan | Visit site |
| MidNite Solar | Arlington, Washington | Visit site |
| Middle East Holding Company | عمّان, Amman | Visit site |
| Midmac Contracting Company W.L.L. | Doha, Doha | Visit site |
| Midstate Mechanical LLC | Phoenix, Arizona | Visit site |
| Midsun Group, Inc. | Southington, Connecticut | Visit site |
| Midwest Access Solutions | Joliet, Illinois | Visit site |
| Midwest Generator Solutions | Mooresville, Indiana | Visit site |
| Mighty Avengers Pvt. Ltd. | Gurugram, Haryana | · |
| Mijn Energiefabriek | Hardenberg, Overijssel | Visit site |
| Mile Solar | Main Street, Ibanda | Visit site |
| Milkyway Chemical Logistics | Shanghai, Shanghai | Visit site |
| Millennium Control Systems | Beachwood, Ohio | Visit site |
| Millennium Energy | الجيزة, Amman | Visit site |
| Miller Electric Company | Jacksonville, Florida | Visit site |
| Milliot Green by Reno·Energy | Saint-André-de-Corcy, Ain | Visit site |
| Milpes Elektronik | Ankara, Ankara | Visit site |
| Milton Rents | Plaistow, New Hampshire | Visit site |
| Milwaukee Tool | Brookfield, Wisconsin | Visit site |
| Mincon | Clare | Visit site |
| Mindaro | Sydney, New South Wales | Visit site |
| Mindtech Energy | Shenzhen Shi, Guangdong | Visit site |
| Ministry of New and Renewable Energy (MNRE) | New Delhi, Delhi | Visit site |
| Ministry of Solar | Ruiselede, West Flanders | Visit site |
| Minnesota Climate Innovation Finance Authority | Saint Paul, Minnesota | Visit site |
| Minnesota Department of Commerce | Saint Paul, Minnesota | Visit site |
| Minnesota Department of Employment and Economic Development | Saint Paul, Minnesota | Visit site |
| Minnesota Environmental Partnership | Saint Paul, Minnesota | Visit site |
| Minnesota Solar Energy Industries Association (MnSEIA) | West St. Paul, Minnesota | Visit site |
| Minnow Environmental, a Trinity Consultants Canada Team | Georgetown, Ontario | Visit site |
| Mirova | Paris, Île-de-France | Visit site |
| Mirsee Robotics Inc. | Cambridge, Ontario | Visit site |
| Mirsolar Enerji | Adapazarı, Sakarya | Visit site |
| Mission Critical | Wrocław, Lower Silesian Voivodeship | Visit site |
| Mission Solar | San Antonio, Texas | Visit site |
| Mission Zero | Leipzig, Saxony | Visit site |
| Missouri Wind and Solar | Seymour, Missouri | Visit site |
| Mister Shade Me | Sharjah, Sharjah | Visit site |
| Mitico | Pasadena, California | Visit site |
| Mitigation Partners, Inc (MPI) | South St. Paul, Minnesota | Visit site |
| Mitra Chem | Mountain View, California | Visit site |
| Mitrex | Etobicoke, Ontario | Visit site |
| Mitsubishi Electric Automation, Inc. | Vernon Hills, Illinois | Visit site |
| Mitsubishi Electric Power Products, Inc. | Wexford, Pennsylvania | Visit site |
| Mofilco--Missouri Filter & Process Equipment Co. | St. Louis, Missouri | Visit site |
| Moja elektrarna d.o.o. | Maribor, Maribor | Visit site |
| Mokun Renewable | Jamshedpur, Jharkhand | Visit site |
| Molyon | Cambridge, England | Visit site |
| Monarch Energy | Twain Harte, California | Visit site |
| Monarch Vegetation Services, Inc. | Cochranton, Pennsylvania | Visit site |
| Mondragon Assembly Group | Aretxabaleta, Gipuzkoa | Visit site |
| Mondragon Assembly México | El Marqués, Querétaro | Visit site |
| Monford Group | Perth, Western Australia | Visit site |
| Monolithic Power Systems, Inc. | Kirkland, Washington | Visit site |
| Montavent | Zürich, Zürich | Visit site |
| Montelec photovoltaïque | Hauts-de-France | Visit site |
| Monterra | Ahmedabad, Gujarat | Visit site |
| Montgomery County Green Bank | Rockville, Maryland | Visit site |
| Monti, Inc. | Cincinnati, Ohio | Visit site |
| Moody's Ratings | New York, New York | Visit site |
| Morel Energy | Lons, Pyrénées-Atlantiques | Visit site |
| Morgan Stanley | New York, New York | Visit site |
| Mosaic (joinmosaic.com) | Oakland, California | Visit site |