| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| ALAUNA RENEWABLE ENERGY LIMITED | 07586543 | 15/08/2024 | Bronze |
| ANCALA BIOENERGY LIMITED | 10697363 | 15/08/2024 | Bronze |
| BIOGEN (UK) LIMITED | 05616520 | 15/08/2024 | Silver |
| BIOGEN BIOENERGY LIMITED | 14947939 | 15/08/2024 | Silver |
| BIOGEN BRYN PICA LIMITED | 07816546 | 15/08/2024 | Silver |
| BIOGEN EM HOLDCO LIMITED | 11021839 | 15/08/2024 | Silver |
| BIOGEN EM LIMITED | 11022488 | 15/08/2024 | Silver |
| BIOGEN EM MIDCO LIMITED | 11020628 | 15/08/2024 | Bronze |
| BIOGEN EM OPCO LIMITED | 08356771 | 15/08/2024 | Amber |
| BIOGEN EM TOPCO LIMITED | 11020593 | 15/08/2024 | Silver |
| BIOGEN GWYRIAD LIMITED | 07816543 | 15/08/2024 | Amber |
| BIOGEN HOLDINGS LIMITED | 08116503 | 15/08/2024 | Silver |
| BIOGEN LTD | 06151086 | 15/08/2024 | Not Trading |
| BIOGEN SOUTHERN LIMITED | 12154571 | 15/08/2024 | One Red Flag |
| BIOGEN WAEN LIMITED | 07816570 | 15/08/2024 | Bronze |
| CROCO PROFESSIONAL SERVICES LTD | 14675475 | 20/02/2023 | Gold |
| ECO2 CANADA TRUSTEE LIMITED | 14304491 | 18/08/2022 | Amber |
| ECO2 DULAIS LIMITED | 12335787 | 27/11/2019 | Dissolved |
| ECO2 DULAIS WINDFARM LIMITED | 12588960 | 04/07/2020 | Dissolved |
| ECO2 LYG LIMITED | 11379265 | 26/09/2018 | Amber |
| FAIRFIELDS FARM ENERGY HOLDINGS LIMITED | 14807160 | 15/08/2023 | Bronze |
| FAIRFIELDS FARM ENERGY LIMITED | 09860962 | 15/08/2024 | Bronze |
| GARSTON POWER LIMITED | 09116787 | 15/08/2024 | Silver |
| GREENFINCH LIMITED | 02829513 | 15/08/2024 | Dissolved |
| HOLBEACH BIOGAS LIMITED | 07739876 | 15/08/2024 | Bronze |
| LOW CARBON ECO2 ENERGY LIMITED | 14307179 | 19/08/2022 | Amber |
| MANOR FARM GREEN ENERGY LIMITED | 09819443 | 15/08/2024 | Bronze |
| OXON RENEWABLES LIMITED | 09329061 | 15/08/2024 | Silver |
| POTESTAS POWER LIMITED | 08664331 | 15/08/2024 | Silver |
| STRAGGLETHORPE ENERGY LIMITED | 09625839 | 15/08/2024 | Silver |
| SUTTON GRANGE AD LIMITED | 07948621 | 15/08/2024 | Two Red Flags |
| TAMAR COMPOSTING (EAST ANGLIA) LIMITED | 05675092 | 15/08/2024 | Amber |
| TAMAR ENERGY (HERMES HOLDINGS) LIMITED | 09090751 | 15/08/2024 | Amber |
| TAMAR ENERGY (HOLDINGS) LIMITED | 09086861 | 15/08/2024 | Amber |
| TAMAR ENERGY DEVELOPMENT COMPANY LIMITED | 03856752 | 15/08/2024 | Bronze |
| TAMAR ENERGY LIMITED | 07703877 | 15/08/2024 | Gold |
| TAMAR ENERGY OPERATING COMPANY (ONE) LIMITED | 09090190 | 15/08/2024 | Silver |
| TAMAR ORGANIC WASTE LIMITED | 09349622 | 15/08/2024 | Gold |
| TAMAR RENEWABLE POWER (BASINGSTOKE) LIMITED | 09090824 | 15/08/2024 | Amber |
| TAMAR RENEWABLE POWER (ESSEX) LIMITED | 07165617 | 15/08/2024 | One Red Flag |
| TAMAR RENEWABLE POWER (HODDESDON) LIMITED | 09090821 | 15/08/2024 | One Red Flag |
| TORNAGRAIN GAS MILL LIMITED | 09843473 | 15/08/2024 | Bronze |
| VERTIGO ENERGY LIMITED | 08365632 | 15/08/2024 | Silver |
| WESTER KERROWGAIR FARM ENERGY LIMITED | 09205081 | 15/08/2024 | Amber |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| ECO2 LIMITED | 05268380 | 18/01/2017 | 26/01/2024 | One Red Flag |
| ECO2 MANAGEMENT SERVICES LIMITED | 08522956 | 18/01/2017 | 14/12/2022 | Silver |