In my renewal options, eon-next have underestimated my annual usage. Based upon my average usage over the last 2 years, eon-next are forecasting my electricity to be 90 kWh less and 533 kWh less for gas.
Whilst that doesn't seem a lot, it makes a noticeable difference to the monthly costs shown for available Tariffs, and it makes the fixed Tariffs look more 'attractive' than they are.
I have 3 options:
NextFlex
Next Online V16
Next 1 Year 15
If I update these Tariffs to my average usage over the last 2 years, the NextFlex would be £5.30 per month more, the Next Online V16 is £8.09 more and the Next 1 Year 15 would be £11.36 per month more.
All of a sudden the 'cheapest' fixed deal becomes less attractive because it is nearly £3 a month more than the variable when using realistic usage figures. That's £3 per month more than eon-next are suggesting on my renewal.
Historically there was a tendency for suppliers to overestimate your usage, I can only assume now that by underestimating they are trying to make the fixed deals look cheaper than they actually are. There are no exit fees on the fixed Tariffs but presumably the majority of customers don't check and will just see out their fixed deal. They'll also wonder why their monthly cost increases during the fixed deal, not realising that their usage was probably underestimated.
The other thing to be aware of is if you're on E7. The Night Rate on NextFlex is 53% of the Day Rate, so just over half the cost.
If I went on to the Next Online V16, the Night Rate increases to 65% of the Day Rate and for the Next 1 Year 15 it increases to 73%.
So anyone who uses storage heaters and opts for the Next 1 Year 15 is going to get hammered.
It's a bit of a guessing game when it comes to opting for a variable or fixed Tariff at the moment, but don't rely on the monthly costs shown on your renewal notice - CHECK IT YOURSELF.