| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| LATTICE GROUP INTERNATIONAL HOLDINGS LIMITED | 04103189 | 08/01/2013 | Dissolved |
| NATIONAL GRID BLUE POWER FINANCE LIMITED | 06300209 | 09/09/2013 | Dissolved |
| NATIONAL GRID ONE LIMITED | 03837074 | 08/01/2013 | Dissolved |
| NATIONAL GRID TWENTY-ONE LIMITED | 04547956 | 08/01/2013 | Dissolved |
| NATIONAL GRID TWO LIMITED | 03875211 | 08/01/2013 | Dissolved |
| NG PROCUREMENT HOLDINGS LIMITED | 02815241 | 08/01/2013 | Dissolved |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| GRIDCOM LIMITED | 04024441 | 08/01/2013 | 01/03/2016 | Dissolved |
| ICELINK INTERCONNECTOR LIMITED | 08082355 | 08/01/2013 | 01/03/2016 | Not Trading |
| KEYSPAN (U.K.) | 03488649 | 11/01/2013 | 01/03/2016 | Dissolved |
| LANDRANCH LIMITED | 01390431 | 08/01/2013 | 01/03/2016 | Not Trading |
| LATTICE GROUP EMPLOYEE BENEFIT TRUST LIMITED | 04045072 | 02/08/2013 | 01/03/2016 | Insolvent |
| LATTICE GROUP TRUSTEES LIMITED | 04082305 | 09/08/2013 | 01/03/2016 | Insolvent |
| NATGRID LIMITED | 03389964 | 08/01/2013 | 01/03/2016 | Dissolved |
| NATIONAL GRID BELGIUM LIMITED | 08288450 | 27/04/2015 | 01/03/2016 | Dissolved |
| NATIONAL GRID BLUE POWER LIMITED | 06300210 | 09/09/2013 | 01/03/2016 | Dissolved |
| NATIONAL GRID FOUR LIMITED | 03928172 | 08/01/2013 | 01/03/2016 | Dissolved |
| NATIONAL GRID PARTNERS LIMITED | 09874533 | 16/11/2015 | 01/03/2016 | Silver |
| NATIONAL GRID TEN | 04341097 | 11/01/2013 | 01/03/2016 | Dissolved |
| NG NOMINEES LIMITED | 02489329 | 31/01/2011 | 01/03/2016 | Not Trading |
| SUPERGRID ELECTRICITY LIMITED | 04563531 | 08/01/2013 | 01/03/2016 | Dissolved |
| SUPERGRID ENERGY TRANSMISSION LIMITED | 04165725 | 08/01/2013 | 01/03/2016 | Dissolved |
| SUPERGRID LIMITED | 02444213 | 08/01/2013 | 01/03/2016 | Dissolved |
| TRANSCO LIMITED | 04023840 | 08/01/2013 | 01/03/2016 | Dissolved |