The other thing to be careful about, on any comparison site, is that these sites compare how much you will save with another supplier with what you would be paying now if you were on your current supplier's standard variable rate, not the specific tariff rate you are actually on, which will be lower.
I investigated this when a comparison site said I could save up to £300 if I changed, so I did, and then actually saved very little, despite comparable fuel consumption for the previous year. I then got a comparison for the next year and was once again told I could save £300. At that point I got suspicious and decided to investigate exactly what was being compared with what.
The reasoning used by the comparison sites is that if you are on a specific tariff with a supplier, which usually runs for a year, when that tariff term ends, if you do not negotiate a different tariff, you will revert to the standard variable rate.
So the comparison is not between what you are paying this year and could save on this amount next year, but what you would pay next year if you reverted to the standard variable rate and what you could pay if you changed tariff.
Sneaky, isn't it? The aim is to encourage you to change supplier so that the comparison site can get a transfer fee.
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