12.—(1) It shall be the duty of a public electricity supplier to develop and maintain an efficient, co-ordinated and economical system of electricity supply.
[F1(2) It shall be the duty of the holder of a licence authorising him to transmit electricity as appropriate having regard to the activities authorised by the licence—
(a)to take such steps as are reasonably practicable to—
(i)ensure the development and maintenance of an efficient, co‐ordinated and economical system of electricity transmission which has the long‐term ability to meet reasonable demands for the transmission of electricity; and
(ii)contribute to security of supply through adequate transmission capacity and system reliability; and
(b)to facilitate competition in the supply and generation of electricity.]
F1SR 2005/335