| Greenbank Turbines Ltd | Carluke | 2011 |
| Greenbatt Energy Ltd | London | 2012 |
| Greencells UK Construction Limited | London | 2026 |
| Greencircle Renewables Ltd | Armagh | 2016 |
| Greencoat Walney Holdco Limited | London | 2011 |
| Greencool Kenya Limited | London | 2022 |
| Greendale Power Ltd | Exeter | 2013 |
| GREENE4EV Limited | London | 2025 |
| Greenearth EAS MOR Limited | Hereford | 2015 |
| Greenearth Sychbant Hydro Limited | Hereford | 2015 |
| Greenenerco Limited | London | 2011 |
| Greener Strategies Ltd | Taunton | 2020 |
| Greenersite Limited | Radstock | 2008 |
| Greenest Energy SW Ltd | Beaminster | 2011 |
| Greenfield Energy Developments Ltd | London | 2021 |
| Greenfield Energy Holdings Ltd | London | 2024 |
| Greenfields (a) Limited | London | 2013 |
| Greenfields (F) Limited | London | 2013 |
| Greenfields (R) Limited | Nr Cricklade | 2019 |
| Greenfields (T) Limited | London | 2014 |
| Greenfields Solar Limited | Nr Cricklade | 2013 |
| Greengairs East Wind Farm Limited | Milnthorpe | 2010 |
| Greengairs Wind Energy Park Limited | London | 2023 |
| Greengairs Wind Farm Limited | Milnthorpe | 2009 |
| Greenglow Electrical Ltd | Southampton | 2021 |
| Greengrid International Ltd | Newcastle | 2025 |
| GREENGRIDPOWER1 Ltd | London | 2020 |
| GREENGRIDPOWER2 Ltd | London | 2020 |
| GREENGRIDPOWER3 Ltd | Ringwood | 2020 |
| Greenheart Energy MWI Limited | Cirencester | 2019 |
| Greenheart Power Africa Limited | Cirencester | 2014 |
| Greenhills 1 Limited | Keith | 2025 |
| Greenhills 2 Limited | Keith | 2025 |
| Greenhouse Utilities Ltd | Bradford | 2010 |
| Greenleaf Renewables Limited | Halbeath, Dunfermline | 2011 |
| Greenlight Asset Holdings 1 Limited | Leatherhead | 2024 |
| Greenlight Inspections Ltd | Cleckheaton | 2026 |
| Greenlink Developments Limited | London | 2018 |
| Greenmoor Storage Limited | London | 2017 |
| Greenock Hydro Power Ltd | Lochgilphead | 2017 |
| Greenolysis Limited | Mansfield | 1999 |
| Greenoverse CIC | Walsall | 2025 |
| Greenpower (Argyll Holdings) Ltd | Alloa | 2024 |
| Greenpower (Argyll) Ltd | Alloa | 2024 |
| Greenpower (Barachander) Ltd | Alloa | 2024 |
| Greenpower (Carie) Limited | Alloa | 2014 |
| Greenpower (Carraig Gheal) Limited | Alloa | 2003 |
| Greenpower (Fordoun) Limited | Alloa | 2014 |
| Greenpower (Wind) Ltd | Alloa | 2011 |
| Greenshoots Energy Limited | Diss | 2010 |
| Greenskares Energy Limited | Forfar | 2012 |
| Greensky Energy Management Limited | Alderley Edge | 2024 |
| Greenspan Contractors Limited | Edinburgh | 2011 |
| Greenspan Electric Balquhindachy Limited | Edinburgh | 2009 |
| Greenspan Electric Cairnmore Limited | Edinburgh | 2009 |
| Greenspan Electric ST. Fergus Limited | Edinburgh | 2009 |
| Greenspan Energy Limited | Edinburgh | 2009 |
| Greenspan Nifty Fifty Limited | Edinburgh | 2016 |
| Greenspire Energy Solutions Ltd | Wallington | 2025 |
| Greensplat Turbine Limited | Wadebridge | 2013 |
| Greenstar Solar Ltd | Fareham | 2024 |
| Greensworld Group Ltd | London | 2022 |
| Greentech Invest UK (1) Limited | Milton Keynes | 2020 |
| Greentech Invest UK (10) Limited | Milton Keynes | 2023 |
| Greentech Invest UK (11) Limited | Milton Keynes | 2025 |
| Greentech Invest UK (12) Limited | Milton Keynes | 2025 |
| Greentech Invest UK (13) Limited | Milton Keynes | 2025 |
| Greentech Invest UK (14) Limited | Milton Keynes | 2025 |
| Greentech Invest UK (15) Limited | Milton Keynes | 2025 |
| Greentech Invest UK (16) Limited | Milton Keynes | 2025 |
| Greentech Invest UK (17) Limited | Milton Keynes | 2025 |
| Greentech Invest UK (18) Limited | Milton Keynes | 2025 |
| Greentech Invest UK (19) Limited | Milton Keynes | 2025 |
| Greentech Invest UK (2) Limited | Milton Keynes | 2020 |
| Greentech Invest UK (20) Limited | Milton Keynes | 2025 |
| Greentech Invest UK (3) Limited | Milton Keynes | 2020 |
| Greentech Invest UK (4) Limited | Milton Keynes | 2020 |
| Greentech Invest UK (5) Limited | Milton Keynes | 2020 |
| Greentech Invest UK (6) Limited | Milton Keynes | 2023 |
| Greentech Invest UK (7) Limited | Milton Keynes | 2023 |
| Greentech Invest UK (8) Limited | Milton Keynes | 2023 |
| Greentech Invest UK (9) Limited | Milton Keynes | 2023 |
| Greentech Power Generation Limited | London | 2022 |
| Greentech Projects Holding UK Limited | Milton Keynes | 2020 |
| Greentech Solution Solar Farm Limited | London | 2025 |
| Greentrack Energy Ltd | Newry | 2020 |
| Greenview Renewables Ltd | Dungannon | 2022 |
| Greenvista Energy Ltd | Louth | 2023 |
| Greenvolt Next (UK) Limited | Warrington, | 2023 |
| Greenwater Ventures Ltd | Bedford | 2026 |
| Greenwatt Global Services Ltd | London | 2025 |
| Greenway Solar Farm Limited | London | 2022 |
| Greenwell Solar Ltd | Bath | 2023 |
| Greenwheel Electric DC Limited | Motherwell | 2025 |
| Greenwheel Electric EV Limited | Motherwell | 2025 |
| Greenwheel Electric GEN Limited | Motherwell | 2025 |
| Greenwheel Electric Limited | Motherwell | 2024 |
| Greenwin Global (UK) Limited | Ely | 2025 |
| Greenwise Energy Ltd | London | 2023 |
| Greenworks Solutions Limited | London | 2024 |