List of pre-nationalisation UK electric power companies

The electrical power industry in the United Kingdom was nationalised by the Electricity Act 1947, when over six hundred electric power companies were merged into twelve area boards. == List of companies == === Companies merged into East Midlands Electricity Board (EMEB) === The board's area was defined as: Leicestershire, Northamptonshire, Rutland and parts of Bedfordshire, Buckinghamshire, Derbyshire, Lincolnshire, Nottinghamshire, Staffordshire and Warwickshire.

Source: Wikipedia — List of pre-nationalisation UK electric power companies (CC BY-SA 4.0)