A woman holds a large bag whilst adjusting her electric heating thermostat.

Economy 20 at a glance

This two-rate tariff is suitable for electric central heating systems, underfloor heating or electric flow boilers.

It provides:

  • 20 hours of cheaper electricity in any 24 hours for approved central heating and hot water systems
  • All other appliances run on the General Power and Lighting Rate at all times

Explaining the rates

Economy 20 Rate

This rate is used for the 20 hours of cheaper electricity in any 24 hours. It can be used for approved central heating and hot water systems.

The remaining four hours in any 24 will be an interruption to your heating and hot water, timed at our discretion.

No interruption will be more than two and a half hours at a time.

You can override the interruption if your heating system already has a booster switch fitted. The units used for heating when the booster switch is used will be charged at our General Power and Lighting Rate.

General Power and Lighting Rate

Electricity used at any time by all other appliances will be charged at the General Power and Lighting Rate.

Key features

Two-rate tariff

20 hours cheaper electricity for approved heating and hot water systems

All other appliances run on the General Power and Lighting Rate at all times

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Economy 20 vs Economy 20 Plus

Economy 20 Plus also offers 20 hours of cheaper electricity for your heating and hot water.

Unlike Economy 20, it provides an uninterrupted supply for 24 hours, with four peak hours charged at a higher rate.

Tariff rates

The card below shows the current rates for the Economy 20 tariff. These rates include GST and are subject to change.

Economy 20

Price per unit

Power & Lighting 15.68p
Economy 20 10.97p

Service charge per day

Single Phase 20.30p
Three Phase 45.10p

All rates are inclusive of GST

Choosing the right tariff

It's not always easy to work out which tariff will give you the best deal. This video explains how to choose the best electricity tariff for you.

Other tariffs

We offer a range of tariffs to suit your needs. If Economy 20 doesn’t sound right for you, take a look at these alternative tariffs.

Economy 20 Plus

A flexible two-rate tariff with 20 hours of cheaper electricity for approved space and water heating. Suitable for central heating systems, underfloor heating, electric flow boilers or heat pumps, providing heat and hot water when you need it.

Learn more

Economy 7

A two-rate tariff which gives you seven hours of cheaper electricity at night.

Learn more

Comfort Heat

A three-rate tariff with eight hours of cheaper electricity for approved space and water heating, and also eight hours of discounted electricity for other appliances. Suitable for storage heaters on a dedicated supply circuit, and if you can use other appliances during the eight-hour discounted period at night.

Learn more

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