Economy 10 is the name of a tariff provided by United Kingdom electricity suppliers created in 2004.
It is named because the corresponding electricity plan offers ten hours of off-peak access during each 24-hour period.
The afternoon and evening periods also provide a top-up to heating systems at off-peak prices.
Off-peak electricity costs can be half of the peak prices, but many Economy 10 tariffs levy an increased standing daily charge.
The structure of the ten off-peak hours is determined by the local distribution network operator rather than the electricity supply company and they vary across the fourteen regions in the UK.