| Golan Wind Ltd | Omagh | 2018 |
| Golconda Energy Limited | Ashbourne | 2010 |
| Gold Crest JTB Limited | London | 2018 |
| Gold Standard Trades Services Ltd | London | 2025 |
| Goldcrest Renewables Limited | London | 2013 |
| Golddy Electriix Limited | Sutton | 2026 |
| Golden Bridge Trading Company Ltd | Manchester | 2025 |
| Golden Hill Solar Limited | London | 2014 |
| Golden Roots Energy Ltd. | London | 2026 |
| Goldeneye Renewables Limited | Kendal | 2014 |
| Goldenpearl Limited | Surrey | 2002 |
| Goldstone Agencies Ltd | Warrington | 2012 |
| Goliath Electrics Ltd | London | 2021 |
| Gomera Energy Limited | London | 2017 |
| Gonst Limited | London | 2026 |
| Good Energy Cedar Windfarm Limited | Chippenham | 2013 |
| Good Energy Development (NO.13) Limited | Wareham | 2013 |
| Good Energy GAS Limited | Chippenham | 2005 |
| Good Energy Generation Limited | Chippenham | 1990 |
| Good Energy Group Limited | Chippenham | 2000 |
| Good Energy Limited | Chippenham | 1999 |
| Good Energy Tidal Limited | Chippenham | 2013 |
| Good Resources Holdings Limited | Kington | 2025 |
| Goodair Limited | Stanford-Le-Hope | 2008 |
| Goodall GAS Limited | Browney | 2011 |
| Goodlife Energy Limited | Cardiff | 2018 |
| Goodpower Energy Ltd | Edinburgh | 2026 |
| Goodyear Utilities Ltd | Holmfirth | 2018 |
| Goole-Ferrybridge Hydrogen Limited | Roslin | 2026 |
| Goonabarn Turbine Limited | Wadebridge | 2014 |
| Goonhilly Limited | Kings Langley | 2011 |
| Goonhilly Solar Limited | Kings Langley | 2014 |
| Goose Green Energy Centre Limited | Norwich | 2024 |
| Gooseberry Hall Solar Limited | Cheltenham | 2023 |
| Gordonstown Hill Wind Farm Limited | London | 2008 |
| Gore Street Energy Trading Limited | London | 2024 |
| Goring Power Ltd | Salford Quays | 2020 |
| Gormack Energy Limited | Blairgowrie | 2012 |
| Gors Hydro CYF | Mold | 2012 |
| Gorst Energy Limited | London | 2014 |
| Gortfinbar Agri Limited | Omagh | 2015 |
| Gorthill AD Limited | Londonderry | 2015 |
| Gortnagross Renewables Limited | Dungiven | 2011 |
| Gortumly Hill Ltd. | Belfast | 2012 |
| Gosfield Solar Limited | London | 2013 |
| Goshawk Energy Limited | Kendal | 2014 |
| Goshawk Solar Limited | Gatwick | 2012 |
| Gothic Renewables Ltd | Norwich | 2020 |
| Goto Energy (UK) Limited | London | 2015 |
| Goulburn River Holdco 1 Limited | London | 2023 |
| Governair Limited | London | 2025 |
| Gower Electric Community Interest Company | Swansea | 2017 |
| Gowhole Battery Storage Limited | Cheltenham | 2022 |
| Goxx Ltd. | | 2004 |
| GP Air Conditioning Limited | Tring | 2019 |
| GP Biotec Ltd | Brecon | 2008 |
| GP Rufaro Solar Equity Pool Limited | Manchester | 2025 |
| GP Rufaro Solar Holdings Limited | Manchester | 2025 |
| GPC 013 Ltd | Altrincham | 2023 |
| GPC 016 Ltd | Altrincham | 2023 |
| GPC 1025 Ltd | Altrincham | 2023 |
| GPC 1039 Ltd | Altrincham | 2022 |
| GPC 1040 Ltd | Altrincham | 2022 |
| GPC 1116 Ltd | Altrincham | 2022 |
| GPC 1127 Ltd | Altrincham | 2023 |
| GPC 1134 Ltd | Altrincham | 2022 |
| GPC 1137 Ltd | Altrincham | 2023 |
| GPC 1154 Ltd | Altrincham | 2022 |
| GPC 1169 Ltd | Altrincham | 2023 |
| GPC 1184 Ltd | Altrincham | 2023 |
| GPC 1194 Ltd | Altrincham | 2023 |
| GPC 1208 Ltd | Altrincham | 2022 |
| GPC 1210 Ltd | Altrincham | 2022 |
| GPC 1211 Ltd | Altrincham | 2022 |
| GPC 1217 Ltd | Altrincham | 2023 |
| GPC 2008 Ltd | Altrincham | 2023 |
| GPC 3018 Ltd | Altrincham | 2023 |
| GPC 483 Ltd | Altrincham | 2022 |
| GPC 596 Ltd | Altrincham | 2022 |
| GPC 604 Ltd | Altrincham | 2022 |
| GPC 612 Ltd | Altrincham | 2023 |
| GPC 632 Ltd | Altrincham | 2022 |
| GPC 676 Ltd | Altrincham | 2022 |
| GPC 678 Ltd | Altrincham | 2023 |
| GPC 700 Ltd | Altrincham | 2022 |
| GPC Project 1 Ltd | Altrincham | 2023 |
| GPC Project 10 Ltd | Altrincham | 2023 |
| GPC Project 11 Ltd | London | 2023 |
| GPC Project 12 Ltd | Altrincham | 2023 |
| GPC Project 13 Ltd | Altrincham | 2023 |
| GPC Project 14 Ltd | Altrincham | 2023 |
| GPC Project 15 Ltd | Altrincham | 2023 |
| GPC Project 16 Ltd | Altrincham | 2023 |
| GPC Project 17 Ltd | Altrincham | 2023 |
| GPC Project 18 Ltd | Altrincham | 2023 |
| GPC Project 3 Ltd | Altrincham | 2023 |
| GPC Project 4 Ltd | Altrincham | 2023 |
| GPC Project 5 Ltd | Altrincham | 2023 |
| GPC Project 6 Ltd | Altrincham | 2023 |
| GPC Project 7 Ltd | Altrincham | 2023 |