| Boultbee Brooks (Energy Storage Larks Lane) Limited | Hereford | 2024 |
| Boultbee Brooks (Energy Storage Mansfield Road) Limited | Hereford | 2023 |
| Boultbee Brooks (Energy Storage Old Park Lane) Limited | Hereford | 2023 |
| Boultbee Brooks (Energy Storage Overseas) Limited | Hereford | 2024 |
| Boultbee Brooks (Energy Storage Weirs Drove) Limited | Hereford | 2024 |
| Boultbee Brooks (Renewables Arley) Limited | Hereford | 2024 |
| Boultbee Brooks (Renewables County Lane) Ltd | Hereford | 2021 |
| Boultbee Brooks (Renewables Finlays Bridge) Limited | Hereford | 2023 |
| Boultbee Brooks (Renewables Highgate) Ltd | Hereford | 2021 |
| Boultbee Brooks (Renewables Ilgars) Ltd | Hereford | 2021 |
| Boultbee Brooks (Renewables Lees New Road) Limited | Hereford | 2023 |
| Boultbee Brooks (Renewables Lower Farm) Ltd | Hereford | 2021 |
| Boultbee Brooks (Renewables Luton HOO) Ltd | Hereford | 2021 |
| Boultbee Brooks (Renewables Monks Wood) Limited | Hereford | 2023 |
| Boultbee Brooks (Renewables Rowley Hill) Limited | Hereford | 2021 |
| Boultbee Brooks (Renewables Ruddles Lane) Limited | Hereford | 2023 |
| Boultbee Brooks (Renewables Tiddie Cross) Limited | Hereford | 2023 |
| Boultbee Brooks (Renewables Walkford Moor) Ltd | Hereford | 2021 |
| Boultbee Brooks Energy Storage Limited | Hereford | 2021 |
| Boultbee Brooks Renewable Energy Limited | Hereford | 2019 |
| Boundary Energy Trading Ltd | London | 2025 |
| Bounty Energy Solutions and Technologies Ltd | Bristol | 2019 |
| Bourne Air Conditioning Limited | Eastbourne | 2022 |
| Bourne Park Solar Limited | London | 2013 |
| Bournemouth Renewables Ltd | Verwood | 2024 |
| Bournemouth Solar Limited | London | 2013 |
| Bowbeat Repowering Limited | Bristol | 2026 |
| Bowden Lane Solar Park Limited | London | 2012 |
| Bower Lane Solar Limited | London | 2023 |
| Bower Power (Wyevale) Limited | Newent | 2014 |
| Bowerhouse II Solar Limited | West Malling | 2019 |
| Bowfell Energy Limited | Oxford | 2018 |
| Bowithick Green Ltd | Bodmin | 2012 |
| Bowker Refrigeration Limited | Ivybridge | 2006 |
| Bowley Storage and Marketing Limited | Leominster | 1978 |
| Bowmore Energy Limited | Bristol | 2011 |
| Bowshiel Solar Ltd | Stonehouse | 2024 |
| Boxed Bills Ltd. | Gateshead | 2026 |
| Boxted Energy Limited | Kings Langley | 2024 |
| Boyd Energy Limited | London | 2011 |
| Boyd Renewables Limited | Omagh | 2012 |
| Boyndie Wind Energy Limited | Edinburgh | 2003 |
| Boyton Solar Park Limited | London | 2011 |
| BP Air Conditioning and Refrigeration Ltd | Boston | 2024 |
| BP Offshore Ltd | Chatham | 2022 |
| BPE Contractors Limited | Neath | 2024 |
| BPF Solar Limited | Chichester | 2022 |
| BPG Infrastructure Ltd | London | 2026 |
| BPM Offshore Ltd. | London | 2026 |
| BPUP2L 1 Limited | Bristol | 2026 |
| Bpuwl 18 Limited | Bristol | 2022 |
| Bpuwl 23 Limited | Bristol | 2022 |
| Bpuwl 25 Limited | Bristol | 2022 |
| Bpuwl 29 Limited | Bristol | 2023 |
| Bpuwl 30 Limited | Bristol | 2023 |
| BR Energy Limited | Omagh | 2016 |
| BRA Utilities Limited | Maidstone | 2026 |
| Brac Engineers Limited | Lichfield | 2011 |
| Brackagh Quarry Windfarm Limited | Murray Street | 2011 |
| Brackendale Limited | London | 2013 |
| Brackenhills Wind Limited | Banff | 2022 |
| Bracks Farm Solar Park Limited | London | 2014 |
| Braco Energy Storage Limited | London | 2020 |
| Braco West Bess Limited | London | 2021 |
| Braco Wind Limited | Dunblane | 2012 |
| Bracon ASH Solar Limited | Corsham | 2016 |
| Bradenstoke Solar Park Limited | Gatwick | 2014 |
| Bradley Energy Services Ltd | Leeds | 2017 |
| Bradley Park Holdings Ltd | Bromsgrove | 2018 |
| Bradley Road Energy Centre Limited | Norwich | 2021 |
| Bradley Solar Limited | Hove | 2013 |
| Bradley Wind Energy 2 Limited | Glasgow | 2020 |
| Bradley Wind Energy Limited | Glasgow | 2014 |
| Brads Plumbing & Heating Ltd | Lincoln | 2023 |
| Bradshaw Utilities Limited | Manchester | 2003 |
| Bradtec Electrics Ltd | Chester Le Street | 2016 |
| Bradwells Achp Ltd | Swindon | 2024 |
| Brady & Renaud Limited | Liphook | 1997 |
| Brae Wind Energy Limited | Edinburgh | 2025 |
| Braehead Energy Ltd | Kilmarnock | 2024 |
| Braemore Energy Ltd | Craigavon | 2026 |
| Braes Energy Park Limited | Glasgow | 2022 |
| Braes of Doune Wind Farm (Scotland) Limited | Edinburgh | 2003 |
| Braeside Wind Limited | Turriff | 2016 |
| Braevallich Hydro Limited | Oban | 2010 |
| Brafield Solar Limited | London | 2015 |
| Braich DDU Limited | Kings Langley | 2011 |
| Braidenhill Farm Wind Limited | Airdrie | 2006 |
| Braidley Energy Limited | Darvel | 2022 |
| Brailsford Renewables Limited | Shepton Mallet | 2025 |
| Braintree Electric Forecourt Ltd | Swindon | 2016 |
| Brake Shetland Limited | London | 2020 |
| Bramble Hall Renewables Limited | Shepton Mallet | 2025 |
| Bramford 2 Green Energy Centre Ltd | Faversham | 2022 |
| Bramford Green Energy Centre Ltd | Faversham | 2022 |
| Bramford Green Limited | Ashton-On-Ribble | 2020 |
| Bramley Battery Storage Limited | London | 2021 |
| Bramley Bess 2 Limited | London | 2019 |
| Bramley Bess Limited | London | 2019 |
| Bramley Solar Limited | London | 2020 |