The Energy Act 2004 (Designation of System Operator) Order 2004
Chapter 1 Part 3 of the Energy Act 2004 makes certain changes to electricity trading and transmission arrangements in Great Britain. In particular, section 135 amends section 4 Electricity Act 1989 (c. 29) so that the prohibition on transmission of electricity becomes a prohibition on participation in the transmission of electricity. Participation in transmission is defined in section 4(3A) and (3B) Electricity Act 1989, as inserted by section 135 Energy Act 2004 and includes co-ordinating and directing the flow of electricity onto and over a transmission system. The person undertaking this activity is a system operator.