ⓘ Economy 10

Economy 10

ⓘ Economy 10

Economy 10 is the name of a tariff provided by United Kingdom electricity suppliers created in 2004. Similar to the Economy 7 this is designed to be used with high thermal mass heating such as storage heaters, underfloor heating, and is also used with electrical boilers driving radiators or water-based heat stores.

In contrast to Economy 7, which only provides off-peak electricity during nighttime hours, Economy 10 tariffs provide ten hours of off-peak heating split between night, afternoon and evening. The advantage of this scheme is that by matching the storage periods better to the times when heat is required, less heat needs to be stored during the day, when there may be no demand for heating. 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. Times are switched automatically, and it is common for the switching times to be locked to either GMT or BST when the meter is installed. Some metering systems use a radio teleswitch controlled by the supplier to vary switching times, and effect the daylight saving time switchover twice a year. Economy 10 thus requires a special multi-tariff meter, different from an Economy 7 meter.

For example, customers in central Scotland within the Scottish Power Energy Networks DNO area are on the following times:

  • 3 hours in the afternoon 1.30pm - 4.30pm
  • 3 hours in early morning 4.30am - 7.30am
  • 4 hours in the evening 8.30pm - 12.30am

Another set of times West Midlands are:

  • 5 hours overnight Midnight - 5am
  • 3 hours in the afternoon 1pm - 4pm
  • 2 hours in the evening 8pm - 10pm
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