Off Peak Heating | Electric Heating in Guernsey | Guernsey Electricity

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Off Peak Electric Heating

Which Off Peak Heating system is right for you?

If you're thinking about installing electric heating, find out more about Off Peak Heating options. Please be aware that the Off Peak Heat 19 Tariff* should only be used with compatible electric heating storage systems, as the necessary controls and storage capacity to avoid drawing peak-rate electricity are unlikely to be present in your existing heating system. Please contact your preferred installer. *AVAILABLE FROM NOVEMBER 2026
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NEW HEATING TARIFF INFORMATION

Please be aware: The product will launch on 1 November 2026. Please contact your preferred installer after 1 November 2026.

IMPORTANT: Off Peak Heat 19 Tariff

Please be aware: if you already have electric heating and use the Superheat Tariff or Heat Pump Tariff, it's unlikely that you can move to the Off Peak Heat 19 tariff with your existing electric heating system. This is because the necessary controls and storage capacity to avoid drawing peak-rate electricity are unlikely to be present in your existing heating system. We strongly recommend you speak to your preferred installer first. 

OFF PEAK HEATING - USE CHEAPER, CLEANER ELECTRICITY

Off Peak Electric Heating

It's time to think differently about electric heating. 

Most people move over to a traditional, 'peak time' electric boiler when they decide to switch to electric heating.

The trouble is, these 'peak time' electric boilers demand power from the grid as soon as the central heating gets switched on. 

This happens alongside everyone else also switching on their heating, cooking dinner, having showers, putting on washing and drying, etc

This sudden, sharp 'spike' in electricity demand uses a huge amount of heavy fuel oil, water, and other expensive resources at the Vale Power Station to make sure everyone gets all the power they need, all at the same time.

Luckily, you can now take your electric heating off-peak.

This will help lower your electric heating bill, cut local pollution, and help reduce future tariff rises. 

Why is this tariff cheaper?

Electricity is most expensive to supply during a few 'peak' periods because that's when we need to use the most resources. Diesel generators need to be brought online at the Vale Power Station, we need to burn through many tonnes of extra fossil-fuel, and the network needs to cope with a sudden spike of heavy extra work. 
By shifting heat demand to 19 off-peak hours, we can pass on a small saving to our Off Peak Heat 19 customers, simply because it costs less to serve them. 
This heating tariff is designed to encourage heating demand to be spread more evenly throughout 24 hours, rather than concentrated at peak times when many heating systems switch on together.
Smoothing out that demand over a longer period means we can supply power far more efficiently and cheaply, which is reflected in this tariff price.
  • Off Peak Heat 19
    This tariff works with Off Peak Storage Boilers and uses off-peak electricity over 19-hours at a cheaper rate, so you can enjoy heating at any time you need it
    See prices
  • Economy 12
    Overnight Storage Heaters run on your Super Economy 12 overnight cheap rate to store heat overnight ready to release the next day.
    See Prices
  • Superheat
    This is the 24/7 electric heating tariff that is a bit pricier to run as its for 'peak' electric heating systems such as flow boilers and combi-boilers.
    See Prices

 

Before you start 

 

 

Applying for 'additional load'

Every single person installing electric heating needs to apply to Guernsey Electricity to check if the underground network has enough capacity to supply them with enough power to run a new electric heating system.

Electric heating demands a huge amount of electricity, so it isn't always a given that your heating installation can go ahead. 

The good news? Off Peak Electric Heating is more likely to be accepted as the demand for power will happen 'off peak', i.e. when the network is quieter and there's more supply than demand. 

To help reduce the likelihood that your application for additional power will get refused, speak to your installer about off peak electric heating. 

 

More about Additional Load Applications