| 29131 | United Kingdom | Hassie Electrical Ltd. | 3 Heol Dyffryn Aur, Kidwelly, Carmarthenshire, SA17 4HJ | +44 1554 811990 | https://www.hassieltd.com | REC Group, SolarWorld Industries GmbH, Panasonic Corporation (Sanyo), LG Electronics, Inc. | SolarEdge Technologies, Ltd. |
| 29132 | United Kingdom | Hatrick Bruce Ltd. | Market House, Milnathort KY13 9XB | +44 1577 863967 | www.hatrickbruce.co.uk | | |
| 29133 | United Kingdom | Hay Electrics | 28 Spencer Rise, London NW5 1AP | +44 20 72677775 | hayelectrics.co.uk | | |
| 29134 | United Kingdom | Haydon Mechanical & Electrical | City Reach, 5 Greenwich View Place, Docklands, London E14 9NN | +44 207 9873555 | www.haydonme.co.uk | | |
| 29135 | United Kingdom | Haysham Ltd | Unit 7, Glenmore Business Centre, Range Road, Windrush Park, Witney, Oxon, OX29 0AA | +44 1993 774888 | www.haysham.co.uk | | |
| 29136 | United Kingdom | HB Renewable Energy | Greenway House Clifford Chambers Stratford Upon Avon Warwickshire CV37 8LD | +44 1789 268453 | https://www.hbrenewable.co.uk | | |
| 29137 | United Kingdom | HBS Group Southern Ltd | Unit 9, Fulcrum 1, Solent Way, Whiteley, Hampshire PO15 7FE | +44 2380 406227 | www.hbsgroupsouthern.co.uk | SunPower Corp., Moser Baer Solar Limited, Znshine PV-tech Co., Ltd., AU Optronics Corporation, Seraphim Solar System Co., Ltd. | SMA Solar Technology AG, Ginlong Technologies Co., Ltd |
| 29138 | United Kingdom | Horsfield Building Services Engineers Ltd | Horsfield Place, Rough Hey Road, Grimsargh, Preston, Lancashire, PR2 5AR | +44 1772 654402 | horsfield.co.uk | | |
| 29139 | United Kingdom | HE&D Electrical Contractors | Trafalger House, 712 London Road | +44 1375 386256 | https://hed-electrical.co.uk | | |
| 29140 | United Kingdom | Head-On Electrical Ltd | Freightliner Road, HULL, HU3 4XL | +44 1482 213177 | www.head-onelectrical.co.uk | | |
| 29141 | United Kingdom | Healy Solec Ltd | 121 Lanehouse Rocks Road, Weymouth, Dorset, DT4 9HY, UK | +44 7906 989855 | www.healysolec.com | SunPower Corp., Canadian Solar Inc., Sharp Energy Solutions Europe, Panasonic Corporation (Sanyo) | SunPower Corp., SMA Solar Technology AG, Sharp Energy Solutions Europe |
| 29142 | United Kingdom | Heat Norfolk Ltd | 155 Reepham Road, Hellesdon, Norwich NR6 5PH | +44 1603 873062 | www.heat-norfolk.co.uk | | |
| 29143 | United Kingdom | Heatforce Wales Ltd. | Unit 10, Lambourne Crescent, Cardiff Business Park, Llanishen, Cardiff, CF14 5GP | +44 29 20763622 | www.heatforce.co.uk | Viessmann Werke GmbH & Co. KG | |
| 29144 | United Kingdom | Heating & Boilers (Dyfed) Ltd | Emlyn Castle, Water Street, Newcastle Emlyn, Carmarthenshire, SA38 9BH | +44 1239 710762 | www.heatingandboilers.co.uk | | |
| 29145 | United Kingdom | Heatology Ltd | 12 Reddaway Drive, Exminster, Exeter, Devon, EX6 8SY | +44 1392 823623 | www.heatology.co.uk | | |
| 29146 | United Kingdom | Heating & Process Engineering Services Ltd. | Crompton Road Industrial Estate, Ilkeston, Derby, DE7 4BG | +44 115 9305838 | www.heatpro.co.uk | | |
| 29147 | United Kingdom | Heatshine Ltd. | Tirowen, Llangoedmor, Cardigan, Pembrokeshire, SA43 2LB | +44 1239 613423 | www.heatshine.com | | |
| 29148 | United Kingdom | Hebs Group Ltd | 4-6, St Johns Road, Waterloo, Liverpool, L22 9QG | +44 151 2360707 | https://hebs-group.co.uk | | |
| 29149 | United Kingdom | Home Energy Efficiency Ltd. | Ingham Lane Farm, Ingham Lane, Bradshaw, Halifax, HX2 9PE | +44 1422 248613 | www.heeltd.com | | |
| 29150 | United Kingdom | Home Energy Group Ltd. | 34, Bracken Bank Crescent, Keighley, West Yorkshire, BD22 7AX | +44 1535 210050 | homeenergygroup.co.uk/ | | |
| 29151 | United Kingdom | Helios Eco Energy Ltd | Sunderland Business and Innovation Center, Wearfield, Sunderland, Tyne & Wear, SR5 2TA | +44 788 5846811 | www.helioseco.net | | |
| 29152 | United Kingdom | Helios Renewable Energy | 49 Tanners Meadow, Strood Green, Brockham, Surrey, RH3 7NJ | +44 7730957724 | www.heliosenergy.co.uk | | |
| 29153 | United Kingdom | Helsdown Electrical Contractors Ltd | Unit 28, Trade City, Avro Way, Brooklands, Weybridge KT13 0YF | +44 800 6126719 | www.helsdownelectrical.co.uk | | |
| 29154 | United Kingdom | Henry Boot Construction Limited | Callywhite Lane, Dronfield, Derbyshire S18 2XN | +44 1246 410111 | www.henrybootconstruction.co.uk | | |
| 29155 | United Kingdom | Henwood Electrical Services Ltd | Athill Barn, St Stephens, Launceston, Cornwall, PL15 8RB | +44 1566 785850 | www.henwoodelectricalservices.co.uk | | |
| 29156 | United Kingdom | Hepher Electrical Services | Unit 14, Brock Way, Knutton, Newcastle Staffs, ST5 6AZ | +44 1782 799901 | www.hepherelectricalservices.co.uk | | |
| 29157 | United Kingdom | Hero Renewables Ltd. | Hero House, Holmes Chapel Rd, Middlewich CW10 0JB | +44 808 2220111 | www.herorenewables.co.uk | JA Solar Holdings Co., Ltd., Canadian Solar Inc., Mitsubishi Electric Corporation | Fronius International GmbH, SolarEdge Technologies, Ltd. |
| 29158 | United Kingdom | Hewer Facilities Management Ltd. | Unit G1, The Aquarius Centre, Edison Close, Waterwells, Quedgeley, Gloucester, GL2 2FN | +44 1452 525854 | www.hewerfm.co.uk | | |
| 29159 | United Kingdom | Hewitt Studios LLP | 28 Morford Street, Bath, BA1 2RT | +44 1225 461919 | https://www.hewittstudios.co.uk | | |
| 29160 | United Kingdom | Hex Energy Ltd | Unit 5, Hope & Aldridge Business Centre, Weddington Road, Nuneaton, Warwickshire, CV10 0HF | +44 02476 999382 | www.hexenergy.co.uk | | |