| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| BLUES MATCH LIMITED | 06126658 | 23/02/2007 | Silver |
| GEOGEN LIMITED | 13117607 | 06/01/2021 | Gold |
| GEON ENERGY LIMITED | 09325908 | 25/11/2014 | Not Trading |
| GEOTHERMAL ENGINEERING LIMITED | 06663174 | 04/08/2008 | Bronze |
| MANHAY GEOTHERMAL LIMITED | 15459562 | 01/02/2024 | Amber |
| Off Grid Energy Ltd | 06587256 | 08/05/2008 | Dissolved |
| PENHALLOW GEOTHERMAL LIMITED | 15459532 | 01/02/2024 | Amber |
| SKRL LIMITED | 09488641 | 13/03/2015 | Dissolved |
| UNITED DOWNS GEOTHERMAL LIMITED | 10868073 | 17/07/2017 | Amber |
| UNITED DOWNS LITHIUM LIMITED | 14461498 | 04/11/2022 | Bronze |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| GEOCUBED LIMITED | 12709660 | 01/07/2020 | 28/03/2022 | One Red Flag |