| E-Minor Ltd | Hereford | 2023 |
| E-Power International Limited | Leigh On Sea | 2020 |
| E-Tricity Ltd | London | 2010 |
| E. a. Shipcare Limited | Southampton | 1995 |
| E.On Drive Infrastructure UK Limited | Birmingham | 2018 |
| E.On Drive Solutions UK Limited | Nottingham | 2020 |
| E.On Energy Solutions Limited | Nottingham | 1997 |
| E.On Next Energy Limited | Nottingham | 1999 |
| E.On UK Battery Storage Systems Limited | Nottingham | 2023 |
| E.On UK CHP Limited | Nottingham | 1992 |
| E.On UK Energy Markets Limited | Nottingham | 2015 |
| E.On UK Green Funding Solutions Limited | Nottingham | 1992 |
| E.On UK Heat Limited | Nottingham | 2017 |
| E.On UK Infrastructure Services Limited | Nottingham | 2011 |
| E.On UK Limited | Nottingham | 1989 |
| E.On UK Network Assets Limited | Nottingham | 1999 |
| E.On UK Steven’S Croft Limited | Nottingham | 2016 |
| E.S.I.C. Ltd | Uckfield | 2017 |
| E.V.A. Electrical Limited | Dunstable | 2006 |
| E2 Energy Limited | 1 Oxford Street | 2012 |
| E2 Technical Limited | Oxted | 2018 |
| E3 Wind Limited | London | 2017 |
| E5 Energy Limited | 1 Oxford St | 2013 |
| EA Air Handlers Ltd | Bromsgrove | 2022 |
| EA Wind Ltd | Dungannon | 2022 |
| Eaasy Comfort Limited | Wolverhampton | 2025 |
| Eaasy Power Limited | Wolverhampton | 2025 |
| EAC Owen Limited | Liverpool | 2018 |
| Eacon Ltd | Reading | 2020 |
| Eagle Duct Limited | Alcester | 2011 |
| Eagle Power Solutions Ltd | Belfast | 2019 |
| Eaglereach Mechanical Limited | Heathfield | 2014 |
| Eagleson's Farm Ltd | Cookstown | 2014 |
| Eakring Limited | London | 2011 |
| Eala Energy Ltd | London | 2026 |
| Earba Limited | Kendal | 2022 |
| Earl Shilton Energy Park Limited | London | 2022 |
| Earlectric Limited | Writtle | 2022 |
| Earls Gate Utilities Limited | Grangemouth | 2023 |
| Earlsburn Wind Energy Limited | Edinburgh | 2003 |
| Earlsburn Wind Farm Extension 2021 Limited | London | 2021 |
| Earlseat Wind Farm Ltd | Kings Langley | 2009 |
| Earl’S Hall Farm Wind Farm Limited | London | 2010 |
| Earth Resources Services Limited | London | 2005 |
| Earth Source Tidal Power Limited | Kilmacolm | 2023 |
| Earthcott Battery Storage Limited | Stonehouse | 2022 |
| EAS MOR H2O Ecology Limited | Maybole | 2015 |
| Eascairt Wind Farm Ltd | Glasgow | 2012 |
| Ease Utilities Limited | London | 2025 |
| East 10 Power Limited | Wymondham | 2021 |
| East Anglia Efficient Solutions Ltd | Colchester | 2025 |
| East Anglia Offshore Wind Limited | London | 2009 |
| East Anglia One Limited | London | 2010 |
| East Anglia One North Limited | London | 2017 |
| East Anglia Three Limited | London | 2012 |
| East Anglia Two Limited | London | 2017 |
| East Anglia Utilities Ltd | March | 2017 |
| East Anglia Windworks Ltd | Great Yarmouth | 2026 |
| East Claydon Bess Limited | Cheltenham | 2023 |
| East Claydon Energy Limited | London | 2024 |
| East Claydon Road Solar Limited | Cheltenham | 2024 |
| East Claydon Storage Limited | London | 2022 |
| East Coast Electric Generating Co. Ltd. | Selby | 1996 |
| East Coast Viners Renewables Limited | Stonehaven | 2013 |
| East Deloraine Energy Limited | Motherwell | 2022 |
| East END Solar Farm Limited | London | 2021 |
| East Energy Limited | West Dereham | 2018 |
| East Farm Codford Solar Limited | Reading | 2012 |
| East Farm Solar Park Limited | Bristol | 2013 |
| East Helscott Renewable Energy Limited | London | 2016 |
| East Kirkby Refrigeration and Air Conditioning Limited | Boston | 2000 |
| East Langford Solar Limited | Kings Langley | 2011 |
| East Langwell Wind Farm Limited | London | 2023 |
| East London Energy Limited | London | 2007 |
| East Lothian Newlands Hill Ltd | Dunbar | 2024 |
| East Midland Solar and Air Conditioning Ltd | Spalding | 2025 |
| East Midlands Air Conditioning Ltd | Nottingham | 2021 |
| East Midlands Cooling Services Ltd | Grantham | 2020 |
| East Solar Ltd | London | 2023 |
| East Witney Green Power Limited | London | 2022 |
| East Witton Hydro Limited | Ripon | 2016 |
| East Yorkshire Solar Farm Limited | London | 2022 |
| East Youlstone Wind Farm Limited | Warrington | 2011 |
| Eastbridge House Solar Ltd | Bath | 2023 |
| Easterdrumclair Ltd. | Airdrie | 2013 |
| Eastern Power Networks PLC | London | 1989 |
| Eastfield Energy Limited | Exeter | 2024 |
| Eastgate Solar Ltd | Stonehouse | 2021 |
| Easton PV Ltd | London | 2016 |
| Easton Renewable Energy Limited | Chester | 2015 |
| Eastridge Energy Limited | Crediton | 2011 |
| Easy Access Rope Solutions Ltd. | Guildford | 2022 |
| Easy Breezy Ltd | Leicester | 2025 |
| Easy Eco Energy Limited | Manchester | 2021 |
| Easy Energy Renewal Limited | Newcastle Upon Tyne | 2018 |
| Easy FIX Trading Ltd | Barking | 2020 |
| Easy Going Hydro Ltd | Cardiff | 2015 |
| Easy Removal London Ltd | Cardiff | 2016 |
| Easy Wave Energy Limited | London | 2025 |
| Easyaire Ltd | Gravesend | 2016 |