The Ministry of Power (then named Ministry of Fuel and Power) was created on 11 June 1942 from functions separated from the Board of Trade.
It took charge of coal production, allocation of fuel supplies, control of energy prices and petrol rationing.
The Petroleum Board, responsible for the coordination of the war-time petroleum 'pool' for oil supplies (except oil for the Royal Navy), continued in this role until the Board was dissolved in 1948.
In 1974, its responsibilities were split out to form the Department of Energy, and then merged back into DTI in 1992; a separate Department of Energy and Climate Change was created in 2008 and then merged back in 2016 to the Department for Business, Energy and Industrial Strategy.
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