Customers could see energy prices rise by up to £265 per year as several dual fuel tariffs end this summer, according to Gocompare.

Consumers on nine of the 16 dual fuel tariffs ending on 30 June will see their energy bills rise as they are automatically rolled onto their supplier’s standard variable tariff.

Npower customers in the Midlands on the Fixed Energy June 2016 tariff will see the largest average rise of £264.61 (31.75 per cent). British Gas, EDF Energy, Npower, Ovo Energy, Sainsbury’s Energy and Scottish Power all have tariffs ending.

Gocompare.com energy spokesperson Ben Wilson said: “As summer sets in it can be easy to forget about your energy bills. However, it’s important to keep on top of when your fixed deal ends or risk being put on a standard tariff.”

The price comparison websites figures also showed that average customers on Ovo Energy’s Better Energy tariff will save £66.77, the largest saving on the tariffs ending.  

These figures follow an announcement from the price comparison company last month that average energy prices were likely to rise by £132 as fixed dual fuel tariffs expired on 31 May. Again, Npower customers who were rolled onto its standard variable tariff saw the highest increase of £193.26.