than gas, or if the supply is used to charge an electric vehicle overnight. An Economy 7 tariff can end up costing significantly more than a standard tariff without restructuring current energy usage. Similar tariffs White Meter is a very similar product used mainly in Scotland. The traditional setup offers up to eight and half hours of off-peak electricity overnight. Newer variants are also available which offer an overnight charging period for storage heating that is automatically varied to take account of forecast temperatures for the following day. Economy 10 offers ten hours of off-peak electricity spread over a 24 hour period. TwinHeat is a product offered by Scottish Power in North Wales and Merseyside which offers four hours of off-peak electricity overnight and three during the afternoon. Originally introduced as 'Menter' in the early 1990s, the product was designed to avoid the need for expensive supply network upgrades in rural Mid Wales by spreading high local demand for electric heating across multiple off-peak periods. See also Economy 10 Energy use and conservation in the United Kingdom Load balancing (electrical power) References External links Economy 7 at uSwitch.com (price comparison site) A Brief Explanation From Northern Ireland Electricity (PDF) Electric power in the United Kingdom 1970s neologisms