| 28051 | United Kingdom | 3Ple Energy | Birmingham Research Park, University of Birmingham, B15 2SQ, Birmingham | +44 121 6616363 | www.3pleenergy.com | | |
| 28052 | United Kingdom | 3s Northampton Limited | Unit 30 Ross Road, Weedon Road Industrial Estate, Northampton, NN5 5AX | +44 1604 494123 | https://3sltd.co.uk | | |
| 28053 | United Kingdom | 4 Seasons Solutions Ltd. | Unit 3, Skyways, Fair Oak Close, Exeter Airport Business Park, Exeter, EX5 2UL | +44 1395 320118 | www.4seasonssolutions.co.uk | | ABB Italy S.p.A., Huawei Technologies Co., Ltd. |
| 28054 | United Kingdom | 4 Way Energy Ltd | Unit 25, Bergen Way, North Lynn Indutrial Estate, King's Lynn, Norfolk, PE30 2JG | +44 1553 767878 | www.4wayenergy.co.uk | | |
| 28055 | United Kingdom | 5D Solar Ltd | Unit 4, Stowford Business Park, Ivybridge, Devon, PL21 0BE | +44 1752 710575 | www.5dgroup.co.uk | | |
| 28056 | United Kingdom | 7 Energy Limited | Unit 12, Harlescott Barns, Harlescott Lane, Shrewsbury, SY1 3SZ | +44 1743 461452 | www.7energy.co.uk | REC Group | SMA Solar Technology AG |
| 28057 | United Kingdom | A & A Electrical Services Ltd | 1 Aerodrome Close, Loughborough, Leicestershire LE11 5RJ | +44 1509 238855 | www.aaelec.com | | |
| 28058 | United Kingdom | A & D Alternative Energy Ltd | Unit 4C, Wistaston Road, Business Park, Crewe, Cheshire, CW2 7RP | +44 1270 749067 | www.adalternative-energy.co.uk | | |
| 28059 | United Kingdom | A & E Leisure | Unit 51-56 Cosgrove Industrial Park, Daisy Bank Lane, Anderton, Northwich, CW9 6FY | +44 16069 73005 | www.aeleisure.co.uk | | |
| 28060 | United Kingdom | A & L Mechanical & Building Services Ltd | Unit 10, Beehive Lane Works, Beehive Lane, CM2 9JY | +44 1245 505300 | aandlmechanical.co.uk | | |
| 28061 | United Kingdom | A A Electrical Ltd | Gorsefell Bealings Road, Martlesham, Woodbridge, IP12 4RW | +44 1473 611155 | www.aaelec.co.uk | | |
| 28062 | United Kingdom | A Armstrong Roofing Contractors | 15 Eden Villas, Washington, NE387EJ | +44 191 4168848 | www.armstrongroofing.expert | | |
| 28063 | United Kingdom | A Craig Electrical Ltd. | Craigbank House, Cleish, Kinross KY13 0LS | +44 7813 331740 | https://www.acraigelectrical.co.uk | | |
| 28064 | United Kingdom | A Gallagher and Son | 227 Penrhos Road, Bangor, Gwynedd, LL57 2DJ | +44 1248 351886 | www.gallagher-roofing-services.co.uk | | |
| 28065 | United Kingdom | A J Lowther & Son Ltd | The Factory, Whitchurch, Ross-on-Wye, Herefordshire, HR9 6DF | +44 1600 890482 | www.ajlowther.com | | |
| 28066 | United Kingdom | A J Taylor Electrical Contractors Ltd | Unit 3 Centenary Industrial Estate, Brighton, East Sussex BN2 4AW | +44 1273 600089 | www.ajtaylor-electrical.co.uk | | |
| 28067 | United Kingdom | A L Energy Plus | Unit 2, Southhook Rd., Kilmarnock KA1 2NN | +44 845 6022053 | https://www.alenergy.co.uk | | |
| 28068 | United Kingdom | A M Hardy Electrical Ltd. | 214 Bricknell Ave, Hull HU5 4QQ | +44 1482 470130 | www.amhardyelectrical.com | | |
| 28069 | United Kingdom | A P H Electrical Contractors Ltd | Unit 12c1, Cannock Wood Industrial Estate, Cannock, Staffs, WS12 0PL | +44 1543 222635 | aphelectricalcontractors.co.uk | | |
| 28070 | United Kingdom | A P Services (Louth) Ltd | Yondar, Legbourne Road, Louth, Lincolnshire, LN11 8LQ | +44 1507 600027 | www.apserviceslouthltd.co.uk | | |
| 28071 | United Kingdom | A R Roofing Services Ltd. | 67, Battalion Drive, Northampton, NN4 6RX | +44 1604 700396 | www.arroofing.co.uk | | |
| 28072 | United Kingdom | A Shade Greener Ltd | Sterling House, Maple Court, Maple Road, Tankersley, South Yorkshire, S75 3DP | +44 345 3012342 | ashadegreener.co.uk | | |
| 28073 | United Kingdom | A Watt Electrical Ltd. | Unit 6 Bell House Farm, Church Lane, Stanway, Colchester CO3 8LS | +44 1206 578621 | www.awattelectrical.co.uk | | |
| 28074 | United Kingdom | A-Plus Electrics | 19 Hopkin Street, Port Talbot, West Glamorgan, SA12 6HA | +44 1639 680159 | www.a-pluselectrics.co.uk | | |
| 28075 | United Kingdom | A. J. Crews & Co Limited | 131B, Cottrell Road, Roath, Cardiff, CF24 3EX | +44 29 21409870 | ajcrews.co.uk | | |
| 28076 | United Kingdom | A. Lloyd Electrical & Solar Limited | 39 Pastoral Way, Sketty, Swansea, SA2 9LY | +44 1792 205679 | www.swanseasolar.co.uk | | |
| 28077 | United Kingdom | A. N. Wallis Co., Ltd | Greasley Street, Bulwell, Nottingham NG6 8NG | +44 115 9271721 | www.an-wallis.co.uk | | |
| 28078 | United Kingdom | A. Todd & Co Ltd | 56 Main Street, The Cross, Newmilns, Ayrshire KA16 9DE | +44 1560 321233 | www.alexandertoddandco.co.uk | | |
| 28079 | United Kingdom | A. Wakeman Electrical Services Ltd | Two Staks, Eagle Lane, Cleobury Mortimer, Worcs, DY14 8RA | +44 7971 096267 | awe-services.co.uk | | |
| 28080 | United Kingdom | A.C. Webb Electrical Contractors Ltd | Opus House, Elm Farm Park, Great Green, Thurston, Bury St. Edmunds, Suffolk, IP31 3SH | +44 1359 232143 | www.webbelectrical.co.uk | | |