| 28591 | United Kingdom | Daylight Energy Ltd. | Unit 19, Slader Business Park, Poole, BH17 0GP | +44 1202 800135 | https://www.daylightenergy.co.uk | | |
| 28592 | United Kingdom | DB Sharp & Sons Ltd. | Sharp House, Unit 4, Woodside Industrial Park, Works Road, Letchworth, Herts, SG6 1LA | +44 1462 672359 | https://www.dbsharpandsons.co.uk | | |
| 28593 | United Kingdom | DBR & Sons Roofing Ltd. | 280 Glastonbury Road, SM4 6PF Morden, Merton | +44 7702 579787 | www.dbrroofing.co.uk | | |
| 28594 | United Kingdom | DC Energy | 66, Faraday Mill Business Park, Plymouth, Devon, PL4 0ST | +44 800 6446797 | https://dcenergy.uk | | |
| 28595 | United Kingdom | DC-Solar Services | 293 Horninglow Rd, North Burton On Trent, Staffs, DE13 0SS | +44 1283 569483 | www.dcsolar-services.co.uk | | |
| 28596 | United Kingdom | DDR Electrical Ltd. | 15 Coverdale Close, Leyburn, North Yorkshire DL8 5NN | +44 1969 622260 | ddrelectricalltd.co.uk | | |
| 28597 | United Kingdom | Deege Solar | Unit 28, Thurrock Commercial Centre, Purfleet Industrial Park, South Ockendon, Essex, RM15 4YA | +44 1322 479369 | https://www.deegesolar.co.uk | | Ningbo Ulica Solar Co., Ltd., LONGi Solar Technology Co., Ltd. |
| 28598 | United Kingdom | Deeks Electrical | 103, Station Road, Harpenden, Hertfordshire, AL5 4UJ | +44 1582 715072 | www.deekselectrical.co.uk | | |
| 28599 | United Kingdom | Definitive Electrical Solutions Ltd. | 20 Fletcher Gate, Nottingham NG1 2FZ | +44 115 9718874 | www.definitive-electrical.co.uk | | |
| 28600 | United Kingdom | Delmar Electrical Installations Ltd | Unit I, Fryers Close, Leamore Enterprise Park, Bloxwich, Walsall, WS3 2XQ | +44 1922 497760 | solarpanelinstallationderby.co.uk | | |
| 28601 | United Kingdom | Delta Power Electrical Services Ltd. | Junction House, 4-6 Southend Road, Beckenham, Kent, BR3 1SD | +44 208 4021305 | www.delta-power.co.uk | | |
| 28602 | United Kingdom | Delta Star | 11, Garden St, Llanbradach, Caerphilly, CF83 3LY | +44 7949 053978 | https://deltastarenergy.co.uk | SolarEdge Technologies, Ltd., SolaX Power Network Technology(Zhejiang) Co.,Ltd. | |
| 28603 | United Kingdom | Deluxe Developers Limited | Cedar Barn, Hungate End Farm, Hanslope, Buckingahmshire, MK19 7HL | +44 1908 510118 | www.deluxedevelopers.co.uk | | |
| 28604 | United Kingdom | Delve & Nankervis Ltd | Penbeagle Industrial Estate, St Ives, Cornwall, TR26 2JH | +44 1736 796804 | https://delve-nankervis.co.uk | | |
| 28605 | United Kingdom | Demse Technical Systems Ltd | Unit 15, Peacock Estate, 20 White Hart Lane, London, N17 8DT | +44 208 8085413 | demsets.com | | |
| 28606 | United Kingdom | Denby Transport Limited | 73 Sadler Road, Lincoln, Lincolnshire, LN6 3JR | +44 1522 503900 | www.denbytransport.co.uk | | |
| 28607 | United Kingdom | Deon Energy | 35 Grafton Way, London W1T 5DB | +44 118 9757075 | www.deonenergy.com | | |
| 28608 | United Kingdom | Derek Mitchell Electrical Ltd | Unit 1, Heathhall Industrial Estate Link Road, Heathhall, Dumfries DG1 3JW | +44 1556 503150 | derekmitchellelec.co.uk | | |
| 28609 | United Kingdom | DeReve Design | 232 Woodhouse Lane, Wigan WN6 7NN | +44 7973 687544 | derevedesign.com | | |
| 28610 | United Kingdom | Doyle Electrical Services | Unit Q, Bristol Court, Martlesham Business Park, Martlesham, Suffolk, IP5 3RY | +44 1473 622674 | www.doyleelectrical.co.uk | | |
| 28611 | United Kingdom | Design Electrical NI Ltd | Unit 6, 2 Westbank Road, Duncrue, Belfast, BT3 9JL | +44 28 95215070 | www.designelectricalni.co.uk | | |
| 28612 | United Kingdom | Devon Electrical Services Ltd | | +44 7570 442366 | https://www.devonelectricalservices.co.uk | Shenzhen Sofar Solar Co., Ltd. | |
| 28613 | United Kingdom | Devon Marine Electronics | Blacklake Farm, East Hill, Ottery St Mary, Devon EX11 1QA | +44 775 3688283 | www.devonmarineelectronics.co.uk | | |
| 28614 | United Kingdom | Devon Power | | +44 1392 581414 | devon-power.com | | |
| 28615 | United Kingdom | DF Roofing | Unit 9, Gary Owen Farm, Laindon Road, Horndon on the hill, Essex, SS17 8QB | +44 1268 906242 | www.dfroofing.com | | |
| 28616 | United Kingdom | DFC Electrical | Pembrokeshire, Wales | +44 1437 890820 | https://www.dfc-electrical.co.uk | | |
| 28617 | United Kingdom | DH Solar Engineering Ltd. | 1a Phoenix Works, North Street, Lewes, East Sussex, BN7 2PE | +44 1273 655547 | www.dh-solarengineering.co.uk | | |
| 28618 | United Kingdom | Diamond Electrical Solutions Ltd. | 1 Friar Road, Brighton, East Sussex, BN1 6NG | +44 1273 917916 | www.diamondelectricalsolutions.co.uk | | |
| 28619 | United Kingdom | Diamond Renewables Ltd. | Unit 1, Chinon Court, Lower Moor Way, Tiverton, EX16 6SS | +44 1363 774377 | diamondrenewablesltd.co.uk/ | SMA Solar Technology AG, SolarEdge Technologies, Ltd., Ginlong Technologies Co., Ltd, SolaX Power Network Technology(Zhejiang) Co.,Ltd. | |
| 28620 | United Kingdom | Direct Electrical (Leics) Ltd | Unit 2, Branston House, West Ave., Wigston, Leicester LE18 2FB | +44 7779 589168 | www.directelectricalleics.co.uk | | |