Two maps published by George Philip & Son Ltd and the Central Electricity Generating Board (CEGB). They were used by staff at British Telecoms (BT) and its predecessors.

The first map is titled 'Electricity Area Boards', and shows the England and Wales Area Boards pre-April 1957, at a scale of ten miles to one inch. The second map is entitled 'Central Electricity Generating Divisions' and shows these areas in England and Wales, giving the location of power stations, transmission lines etc. The second map is dated April 1958, and is a revision of a map first produced in April 1951. It is drawn at the same scale.