Three-Day Week

The Three-Day Week was one of several measures introduced in the United Kingdom in 1973–1974 by Edward Heath's Conservative government to conserve electricity, the generation of which was severely restricted owing to industrial action by coal miners and railway workers.

From 1 January 1974, commercial users of electricity were limited to three specified consecutive days' consumption each week and prohibited from working longer hours on those days. Services deemed essential (e.g. hospitals, data centres, supermarkets and newspaper printing presses) were exempt. Television companies were required to cease broadcasting at 22:30 to conserve electricity, although this restriction was dropped after a general election was called. The Three-Day Week restrictions were lifted on 7 March 1974.

The measure was a major disaster for the Heath government, contributing to the losses in both the February election and the subsequent October election. Following the losses Margaret Thatcher challenged Heath to a leadership contest and subsequently won.