The government's energy regulator, Ofgem, updates the price of the Standard Variable Tariff every three months, which also changes the prices for Fused customers.
Prices for all UK energy customers on a variable tariff, regardless of their supplier, change every three months at the moment because the Ofgem Energy Price Cap also changes that often.
You'll always get 30 day's notice from Fused if your pricing will change.
If you still have questions, or think you might have gotten an email in error, get in touch via LiveChat at the bottom of the screen and select the price cap option when it appears👍