| Powergen Group Investments | (1) |
| | _ E.ON UK Plc | (20) |
| | _ | _ Powergen Retail Ltd | (118) |
| | _ | _ | _ Economy Power Ltd | (0) |
| | _ | _ | _ Powergen Warm Front Limited | (0) |
| | _ | _ | _ Energy Collection Services Limited | |
| | _ | _ | _ Utility Debt Services Limited | |
| | _ | _ | _ Powergen Retail Supply Limited | |
| | _ | _ | _ E.On Uk Industrial Shipping Limited | |
| | _ | _ Powergen (East Midlands) Investments | (0) |
| | _ | _ E.On UK Trading Ltd | (0) |
| | _ | _ EON UK CHP Ltd | (0) |
| | _ | _ | _ EON UK Cogeneration Limited | (0) |
| | _ | _ | _ Citigen (London) Limited | (0) |
| | _ | _ E.ON UK ENERGY SERVICES LIMITED | (0) |
| | _ | _ | _ Chn Group Ltd | (0) |
| | _ | _ | _ | _ Chn Contractors Ltd | (0) |
| | _ | _ | _ | _ Chn Gas Service And Maintenance Limited | (0) |
| | _ | _ | _ | _ Chn Electrical Services Limited | (0) |
| | _ | _ | _ | _ Industry Development Services Limited | |
| | _ | _ | _ | _ Chn Special Projects Limited | |
| | _ | _ | _ E.On Uk Ps Limited | |
| | _ | _ | _ Metering Services Limited | |
| | _ | _ Biogeneration Limited | (0) |
| | _ | _ Powergen Power no. 3 Limited | (0) |
| | _ | _ | _ E.On Uk Ironbridge Limited | |
| | _ | _ Ergon Finance Limited | (0) |
| | _ | _ E.On Uk Gas Limited | (0) |
| | _ | _ Empower Training Services Limited | (0) |
| | _ | _ Holford Gas Storage Limited | |
| | _ | _ Powergen Australia Investments Limited | |
| | _ | _ Powergen International Limited | |
| | _ | _ Cottam Development Centre Limited | (0) |
| | _ | _ E.On Climate & Renewables Uk Limited | (0) |
| | _ | _ E.On Uk Secretaries Limited | |
| | _ | _ Ergon Nominees Limited | |
| | _ | _ Powergen Investments Limited | |
| | _ | _ Powergen Serang Limited | |
| | _ | _ Midlands Electricity Connections Limited | |
| | _ | _ Power Technology Limited | |
| | _ | _ Ergon Properties Limited | |
| | _ | _ E.On Climate & Renewables Carbon Sourcing Limited | |
| | _ | _ E.On Energy Uk Limited | |
| | _ | _ East Midlands Electricity Generation (Corby) Limited | |
| | _ | _ East Midlands Electricity Share Scheme Trustees Limited | |
| | _ | _ Powergen Weather Limited | |
| | _ | _ E.On Uk Directors Limited | |
| | _ | _ Powergen Share Trustees Limited | |
| | _ | _ E.On Uk Pension Trustees Limited | |
| | _ | _ Powergas Limited | |
| | _ | _ The Power Generation Company Limited | |
| | _ | _ E.On Uk Energy Solutions Limited | |
| | _ | _ Midlands Electricity Engineering Services Limited | |
| | _ | _ Hams Hall Management Company Limited | |
| | _ | _ Kinetica Limited | |
| | _ | _ Powergen (East Midlands) Loan Notes | |
| | _ | _ Midlands Electricity Electrical Contracting Limited | |
| | _ | _ Powergen Gas Limited | |
| | _ | _ Powergen Renewables Developments Limited | |
| | _ | _ Powergen Chp Limited | |
| | _ | _ E.On Uk Retail Limited | |
| | _ | _ Midlands Electricity Limited | |
| | _ | _ Meter Services Ltd | |
| | _ | _ Powergen Energy Solutions Limited | |
| | _ | _ Powergen Renewables Limited | |
| | _ | _ Powergen Finance Limited | |
| | _ | _ Ergon Power Limited | |
| | _ | _ Midlands Electricity Metering Limited | |
| | _ | _ Gen Net.Com Limited | |
| | _ | _ Powergen Cogeneration Limited | |
| | _ | _ East Midlands Electricity Distribution Limited | |
| | _ | _ Diamond Power Generation Limited | |
| | _ | _ Powergen Retail Gas Limited | |
| | _ | _ East Midlands Electricity Limited | |
| | _ | _ London Array Limited | |
| | _ | _ Ct Services Holdings Limited | |
| | _ | _ Eme Distribution No. 2 Limited | |
| | _ | _ Powergen Ireland Limited | |
| | _ | _ Lighting For Staffordshire Holdings Limited | |
| | _ | _ Powergen Power No. 2 Limited | |
| | _ | _ Powergen Power No. 1 Limited | |
| | _ | _ Thor Holdings Limited | |
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