The Electricity (Supply) Act 1919 (9 & 10 Geo. 5. c. 100) was an Act of the Parliament of the United Kingdom which amended the law with respect to the supply of electricity. It established the statutory body of the Electricity Commissioners ‘to promote, regulate and supervise the supply of electricity’ under the direction of the Board of Trade. It provided for the formation of electricity districts and, where necessary, the establishment of joint electricity authorities, ‘to provide or secure the provision of a cheap and abundant supply of electricity’.