# The biggest energy companies in South East

The energy companies registered in South East with the highest turnover in their latest filed accounts, ranked, with profit and growth.

Cubicle Washroom Systems is the biggest company among the energy companies registered in South East by turnover, with £9.67m in its latest filed accounts. Robertet(U.K.) and Kellogg Brown & Root Solutions follow. Together the 10 companies below turned over £26.2m in their latest filed years.

| Rank | Company | Town | Turnover | Year |
| ---: | --- | --- | ---: | --- |
| 1 | [Cubicle Washroom Systems](https://firmfacts.co/company/cubicle-washroom-systems-09919041) | Hampshire | £9.67m | FY to Dec 2025 |
| 2 | [Robertet(U.K.)](https://firmfacts.co/company/robertetuk-01010651) | Surrey | £9.05m | FY to Dec 2022 |
| 3 | [Kellogg Brown & Root Solutions](https://firmfacts.co/company/kellogg-brown-root-solutions-02035186) | Leatherhead | £3.63m | FY to Dec 2025 |
| 4 | [Mavala UK](https://firmfacts.co/company/mavala-uk-00982615) | Crowthorne | £2.63m | FY to Dec 2025 |
| 5 | [Aa Heating Group](https://firmfacts.co/company/aa-heating-group-15885450) | Fareham | £691k | FY to Mar 2025 |
| 6 | [Valvenok](https://firmfacts.co/company/valvenok-14001810) | Bicester | £161k | FY to Mar 2025 |
| 7 | [Pce Solutions](https://firmfacts.co/company/pce-solutions-13923253) | Fareham | £130k | FY to Mar 2025 |
| 8 | [Evans Eng. Consultancy](https://firmfacts.co/company/evans-eng-consultancy-09499789) | High Wycombe | £115k | FY to Mar 2025 |
| 9 | [JCW Engineering Consultants](https://firmfacts.co/company/jcw-engineering-consultants-08944487) | High Wycombe | £46.5k | FY to Mar 2025 |
| 10 | [Mjam](https://firmfacts.co/company/mjam-04752350) | Didcot | £27.4k | FY to Aug 2025 |

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Updated 2026-11-03 from the latest filed accounts at Companies House (Open Government Licence v3.0). Page: https://firmfacts.co/blog/biggest-energy-companies-in-south-east