| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| Npower Energy Sales Ltd | 03787887 | 06/09/2002 | Dissolved |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| E.ON NEXT ENERGY LIMITED | 03782443 | 13/09/2000 | 01/10/2008 | Silver |
| ELECTRICITY PLUS SUPPLY LIMITED | 05199936 | 31/03/2006 | 01/10/2008 | Bronze |
| ENERGY RETAIL ASSOCIATION LIMITED | 04844678 | 19/09/2003 | 31/12/2004 | Not Trading |
| Elegenix Ltd | 04006658 | 29/06/2001 | 31/10/2002 | Dissolved |
| GAS PLUS SUPPLY LIMITED | 05199935 | 31/03/2006 | 01/10/2008 | Bronze |
| GLACIUS NO. 1 LIMITED | 06574673 | 29/04/2008 | 07/10/2008 | Dissolved |
| MY HOME MOVE LTD | 03874320 | 06/09/2002 | 22/07/2004 | One Red Flag |
| NPOWER COMMERCIAL GAS LIMITED | 03768856 | 06/09/2002 | 01/10/2008 | Silver |
| NPOWER FINANCIAL SERVICES LIMITED | 03925068 | 06/09/2002 | 01/10/2008 | Dissolved |
| NPOWER GAS LIMITED | 02999919 | 06/09/2002 | 01/10/2008 | Not Trading |
| NPOWER LIMITED | 03653277 | 06/09/2002 | 01/10/2008 | Silver |
| NPOWER NORTHERN LIMITED | 03432100 | 06/09/2002 | 01/10/2008 | Not Trading |
| NPOWER NORTHERN SUPPLY LIMITED | 02845740 | 06/09/2002 | 01/10/2008 | Not Trading |
| NPOWER RENEWABLES AND CONSOLIDATION SERVICES LIMITED | 02842079 | 06/09/2002 | 20/05/2008 | Dissolved |
| NPOWER YORKSHIRE LIMITED | 03937808 | 06/09/2002 | 01/10/2008 | Not Trading |
| NPOWER YORKSHIRE SUPPLY LIMITED | 04212116 | 06/09/2002 | 01/10/2008 | Not Trading |
| National Power Innogy Ltd | 03528194 | 29/06/2001 | 31/10/2002 | Dissolved |
| National Wind Power Ltd | 03528203 | 29/06/2001 | 31/10/2002 | Dissolved |
| Npower Communications Ltd | 03925119 | 06/09/2002 | 20/05/2008 | Dissolved |
| Npower Customer Services Ltd | 03938730 | 06/09/2002 | 20/05/2008 | Dissolved |
| Npowerone Ltd | 04023421 | 15/03/2001 | 22/11/2004 | Dissolved |
| PLUS SHIPPING SERVICES LIMITED | 04508350 | 31/03/2006 | 01/10/2008 | Amber |
| REGENESYS TECHNOLOGIES | 03527866 | 15/05/2001 | 31/10/2002 | Dissolved |
| RWE MARKINCH LIMITED | 06574689 | 29/04/2008 | 07/10/2008 | Silver |
| RWE SOLUTIONS UK LIMITED | 01142192 | 04/11/2005 | 01/10/2008 | Dissolved |
| Regenesys Technologies Group Ltd | 04281558 | 24/09/2001 | 31/10/2002 | Dissolved |
| SCARCROFT INVESTMENTS LIMITED | 02798178 | 09/10/2003 | 01/10/2008 | Dissolved |
| Thorgen Ltd | 03527867 | 29/06/2001 | 31/10/2002 | Dissolved |
| Virtutel Ltd | 03732775 | 06/09/2002 | 20/05/2008 | Dissolved |
| YE GAS LIMITED | 02571590 | 06/09/2002 | 20/05/2008 | Dissolved |
| YORKSHIRE ENERGY LIMITED | 02571588 | 06/09/2002 | 01/10/2008 | Dissolved |