EXHIBIT 21.1

                   Southern Investments UK plc - subsidiaries

SIUK plc Subsidiary                                    % owned     Status
South Western Electricity plc                            100        Operating
    @ebusiness Limited                                   100        Dormant
    Aztec Insurance Limited                              100        Operating
    EA Technology Limited                                7.7        Operating
    ElectraLink Limited                                  6.19       Operating
    Electricity Association Limited                      5.9        Operating
    Electricity Pensions Limited                         0          Operating
    Electricity Pensions Trustee Limited                 5          Operating
    ESN Holdings Limited                                 4.5        Operating
    Meter Reading Services Limited                       100        Operating
    Non-Fossil Purchasing Agency Limited                 8.3        Operating
    Northmere Limited                                    0          Operating
    REC Collect Limited                                  25         Operating
    South West Enterprise Limited                        0          Operating
    South Western Helicopters Limited                    100        Operating
    St Clements Services Limited                         9.1        Operating
    Western Energy Limited                               100        Dormant
    Western Power Generation Limited                     100        Operating
       Western Power Investments Limited                 100        Operating
            Teesside Power Limited                       7.7        Operating
            Wind Resources Limited                       45         Operating
                  Carland Cross Limited                  100        Operating
                  Coal Clough Limited                    100        Operating
    Western Power Networks Limited                       100        Dormant
    Western Power Pension Trustee Limited                100        Dormant
    Western Power Training Limited                       100        Dormant
    WPD Energy Limited                                   100        Dormant
    WPD Helicopter Unit Limited                          100        Dormant
    WPD Insurance Limited                                100        Operating
    WPD Investments Limited                              100        Operating
       Croeso Systems Development Limited                50         Operating
       ebusiness South West Limited                      45         Operating
    WPD Limited                                          100        Dormant
    WPD Meter Operator Services Limited                  100        Dormant
    WPD Property Developments Limited                    100        Operating
       Temple Back Developments Limited                  49         Operating
            Weston-Super-Mare Developments Limited       100        Operating
    WPD Property Investments Limited                     100        Operating
    WPD Share Scheme Trustees Limited                    100        Dormant
    WPD Telecoms Limited                                 100        Dormant
Surf Telecoms Limited                                    100        Operating
Western Power Distribution Telecoms Limited              100        Operating