| 29581 | United Kingdom | MAT Electrics Ltd | Unit 10 Sandpiper Court, Harrington Lane, Exeter, Devon, EX4 8NS | +44 1392 469472 | www.matelectrics.co.uk | | |
| 29582 | United Kingdom | Matley Electrical & Solar | Trevas, Higer Amalwhidden, Towednack, St Ives, TR26 3AR | +44 1736 799170 | https://www.stiveselectricians.co.uk | | |
| 29583 | United Kingdom | Matrix Energy Systems Limited | Unit 7, Highgrounds Industrial Estate, Worksop S80 3A | +44 114 4785860 | www.matrixenergysystems.co.uk | | |
| 29584 | United Kingdom | Max Fordham | 42-43 Gloucester Crescent, London, NW1 7PE | +44 20 72675161 | www.maxfordham.com | Fronius International GmbH | |
| 29585 | United Kingdom | MB Electrics | 9 Puriton Road, Pawlett, Bridgater, Somerset, TA6 4RS | +44 1278 683552 | www.mbelectrics.net | Panasonic Corporation (Sanyo), Znshine PV-tech Co., Ltd. | SMA Solar Technology AG |
| 29586 | United Kingdom | MB Services Group | 7 Kingfisher Place, Kingennie Dundee DD5 3JZ | +44 1382 690960 | https://www.mbservicesgroup.com | | |
| 29587 | United Kingdom | MBL Solar | 27 Main Street, Monk Fryston, Leeds, West Yorkshire, LS25 5EG | +44 845 6891270 | www.mblsolar.co.uk | SolarWorld Industries GmbH, Hanwha Q CELLS GmbH, Canadian Solar Inc. | SMA Solar Technology AG |
| 29588 | United Kingdom | MCA Renewables | 112 Mid-Wharf St, Glasgow G4 0LD | +44 141 3330700 | www.mcarenewables.com | | |
| 29589 | United Kingdom | McCormick Electrical Ltd | Unit 14, Parliament Business Centre, Liverpool, Merseyside, L8 7BL | +44 151 7074371 | www.mccormickelectrical.co.uk | | |
| 29590 | United Kingdom | McCrory Plumbing & Heating | Connaught 5, Green Lane, Devizes, SN10 5BL | +44 7500 069464 | mccroryph.co.uk | | |
| 29591 | United Kingdom | McGill Electrical Ltd. | Harrison Rd., Dundee, DD2 3SN | +44 1382 833833 | www.mcgill.co.uk | | |
| 29592 | United Kingdom | McLachlan Electrical | 4 Denside, Letham Grange, Arbroath, DD11 4QL | +44 7773 760732 | https://www.mclachlan-electrical.com | | |
| 29593 | United Kingdom | McNally & Thompson Ltd. | Unit 1 North Hylton Enterprise Park, Sunderland, SR5 3AD | +44 191 5496843 | mcnallyandthompson.co.uk | | |
| 29594 | United Kingdom | McVickers Ltd. | Unit 2 Woodland Court, Greencroft Industrial Park, Annfield Plain Stanley, Co Durham DH9 7BF | +44 1207 291700 | www.mcvickers.co.uk | | Systovi |
| 29595 | United Kingdom | MD Group | The Malt House, Durnford Street, Ashton, Bristol BS3 2AW | +44 117 9664466 | www.mdgroup.co.uk | | |
| 29596 | United Kingdom | MDJ Group | Unit 8, Stanley Court, Edison Close, Waterwells Business Park, Quedgeley, Gloucester, GL2 2AE | +44 1452 720973 | www.mdjgroup.co.uk | Panasonic Corporation (Sanyo) | SMA Solar Technology AG |
| 29597 | United Kingdom | Meadley Enterprises Ltd. | 20-22, Bedford Row, London, WC1R 4JS | +44 203 7939995 | meadley.org/ | | |
| 29598 | United Kingdom | Meadotech Ltd | Unit 4 Henley Grove, Industrial Estate, Rotherham S61 1RS | +44 114 2426465 | www.meadotech.co.uk | Victron Energy BV | Victron Energy BV |
| 29599 | United Kingdom | Mears Group PLC | 1390 Montpellier Court, Gloucester Business Park, Brockworth, Gloucester, GL3 4AH | +44 870 6071400 | www.mearsgroup.co.uk | | |
| 29600 | United Kingdom | Mechurion Limited | 5 Alexandra Terrace, Abernant, Aberdare, Mid Glamorgan, CF44 0RG | +44 330 9009003 | www.mechurion.co.uk | | |
| 29601 | United Kingdom | Medoria Solar Limited | 106, Lyndale Drive, Wrenthorpe, Wakefield, West Yorkshire, WF2 0NG | +44 7723 334791 | www.medoriasolar.co.uk | SolarEdge Technologies, Ltd., Fimer S.p.A. | |
| 29602 | United Kingdom | Multiple Electrical Engineering Services Ltd. | Unit 4, Crosshatch House, Cross Road, Tadworth, KT20 5SR | +44 1737 816234 | www.mees.uk.com | | |
| 29603 | United Kingdom | Megapower | 314 Midsummer Court, Midsummer Boulevard, Milton Keynes, MK9 2UB | +44 1908 470004 | https://www.megapowerglobal.com | Hoppecke Batterien GmbH & Co. KG, Fronius International GmbH, BYD Company Limited, LG Chem | |
| 29604 | United Kingdom | Meridian Environmental | 37 Hewitt Road, Hamworthy, Poole, Dorset, BH15 4QB | +44 1202 466997 | www.meridian-environmental.co.uk | | |
| 29605 | United Kingdom | Merton Electricians | PB13, Unit 22, Mitcham Industrial Estate, Mitcham London, Surrey CR4 2AP | +44 20 80501397 | www.mertonelectrician.com | | |
| 29606 | United Kingdom | Metartec | Elm Park House, Elm Park Court Pinner, Middlesex, HA5 3NN | +44 845 6439772 | https://www.metartec.com | | |
| 29607 | United Kingdom | Metka EGN | 99 White Lion Street, N1 9PF London | +44 20 80013341 | www.metka-egn.com | | |
| 29608 | United Kingdom | MG Cavill Technical Services | Lark House, Palestine, Andover, Hampshire, SP11 7EN | +44 1264 889710 | www.mgcavill.co.uk | | |
| 29609 | United Kingdom | MH Electrical Ltd. | Haffield Lodge, Gloucester Road, Ledbury, Herefordshire HR8 2JB | +44 1242 692330 | www.mh-electrical.co.uk | | |
| 29610 | United Kingdom | Mi Charge | 17 Swansey Lane, Whittle-Le-woods, Chorley, Lancashire PR6 7NR | +44 7734 237434 | www.mi-charge.co.uk | | |