The reservation covers the generation, transmission, distribution and supply of electricity. This would include the regulation of the electricity supply industry under Part I of the Electricity Act 1989.  That Part gives the Secretary of State and the Director General of Electricity Supply extensive powers to regulate the industry through a system of licensing of generation, transmission and supply, sets out the duties of public electricity suppliers, and imposes further controls for the protection of the public interest and the protection of consumers.
The reservation also covers the subject-matter of Part II of the 1989 Act, which deals with the re-organisation of the industry by privatisation.
TABLE OF RESERVED MATTERS Head C: Trade and Industry Reservation