| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| Npower Communications Ltd | 03925119 | 02/01/2007 | Dissolved |
| Npower Customer Services Ltd | 03938730 | 02/01/2007 | Dissolved |
| Npower Energy Sales Ltd | 03787887 | 02/01/2007 | Dissolved |
| Virtutel Ltd | 03732775 | 02/01/2007 | Dissolved |
| Yeg Freshco. | 03178492 | 02/01/2007 | Dissolved |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| E.ON NEXT ENERGY LIMITED | 03782443 | 02/01/2007 | 31/10/2011 | Silver |
| ELECTRICITY PLUS SUPPLY LIMITED | 05199936 | 02/01/2007 | 31/10/2011 | Gold |
| GAS PLUS SUPPLY LIMITED | 05199935 | 02/01/2007 | 31/10/2011 | Silver |
| METERPLUS LIMITED | 03020536 | 02/01/2007 | 31/10/2011 | Dissolved |
| NPOWER BUSINESS AND SOCIAL HOUSING LIMITED | 00893718 | 30/01/2009 | 31/10/2011 | Dissolved |
| NPOWER COMMERCIAL GAS LIMITED | 03768856 | 02/01/2007 | 31/10/2011 | Silver |
| NPOWER FINANCIAL SERVICES LIMITED | 03925068 | 02/01/2007 | 31/10/2011 | Dissolved |
| NPOWER GAS LIMITED | 02999919 | 02/01/2007 | 31/10/2011 | Not Trading |
| NPOWER LIMITED | 03653277 | 02/01/2007 | 31/10/2011 | Silver |
| NPOWER NORTHERN LIMITED | 03432100 | 02/01/2007 | 31/10/2011 | Not Trading |
| NPOWER NORTHERN SUPPLY LIMITED | 02845740 | 01/10/2008 | 31/10/2011 | Not Trading |
| NPOWER RENEWABLES AND CONSOLIDATION SERVICES LIMITED | 02842079 | 02/01/2007 | 28/06/2010 | Dissolved |
| NPOWER YORKSHIRE LIMITED | 03937808 | 02/01/2007 | 31/10/2011 | Not Trading |
| NPOWER YORKSHIRE SUPPLY LIMITED | 04212116 | 01/10/2008 | 31/10/2011 | Not Trading |
| OCTOPUS ELECTRICAL LIMITED | 00830299 | 30/01/2009 | 31/10/2011 | Dissolved |
| PLUS SHIPPING SERVICES LIMITED | 04508350 | 02/01/2007 | 31/10/2011 | Amber |
| REBYL LIMITED | 04043701 | 08/05/2007 | 31/10/2011 | Dissolved |
| RWE GENERATION UK HOLDINGS LIMITED | 03987817 | 14/02/2008 | 31/10/2011 | Gold |
| RWE GENERATION UK PLC | 03892782 | 14/02/2008 | 31/10/2011 | Gold |
| RWE SOLUTIONS UK LIMITED | 01142192 | 14/02/2008 | 31/10/2011 | Dissolved |
| SCARCROFT INVESTMENTS LIMITED | 02798178 | 02/01/2007 | 31/10/2011 | Dissolved |
| SUPERIOR PLUMBING INSTALLATIONS GROUP LIMITED | 05982888 | 30/01/2009 | 08/02/2010 | Dissolved |
| SUPERIOR PLUMBING INSTALLATIONS HOLDINGS LIMITED | 05982875 | 30/01/2009 | 08/02/2010 | Dissolved |
| YE GAS LIMITED | 02571590 | 24/01/2001 | 31/10/2011 | Dissolved |
| YORKSHIRE ENERGY LIMITED | 02571588 | 02/01/2007 | 31/10/2011 | Dissolved |