Your monthly payment may change for several reasons — even if you're on a fixed tariff. Here's what could be causing the change and how we calculate your charges.
Understanding Your Tariff Type
Fixed Tariff
Your unit rate per kWh stays the same for the length of your contract.
However, your monthly payment may still go up or down based on your energy usage.
Standard Variable Tariff (SVT)
Your rates and payments can change in line with the Ofgem energy price cap, which is reviewed every 3 months.
Changes in wholesale energy prices can cause your payment to increase or decrease.
Unlimited Energy Contract
Your monthly payment stays the same throughout your contract, regardless of your usage. (Subject to fair usage terms.)
Reasons Your Monthly Payment Might Change
First Payment After Joining
When you first sign up, your initial payment may be smaller than your agreed monthly price.
This is a pro-rata payment, covering only the days from when your service started until your first full billing cycle.
After this, your agreed monthly payment (as confirmed on your sign-up link or over the phone) will begin.
Higher Energy Usage
After your first 3 months, we start reviewing your usage monthly.
If you consistently use more than your allowance, we may increase your payment to avoid a large charge at the end of your contract.
You’ll be notified by email with a new invoice if this happens.
Changes to the Energy Price Cap
If you’re on a Standard Variable Tariff, your payment may adjust every 3 months when Ofgem updates the cap.
New Products or Services
If you’ve added a service like broadband or council tax billing, we’ll adjust your monthly payment to reflect this.
Housemate Changes
If you’re using our split billing option and someone moves in or out, your share of the bill may change.
Annual Price Reviews
Suppliers (e.g. broadband and water companies) often review prices around 1st April each year.
These updated prices are passed directly onto your bill, and we’ll give you advance notice.
End-of-Tenancy Adjustments
Your contract is based on a yearly energy allowance.
If you use less than expected, any credit will be refunded at the end.
If you use more, the extra will be billed to you — your smart meter readings are used to calculate this.
Why Does My Invoice Look Different Than Expected?
Some common reasons:
A service may have been removed in error (like broadband). If fixed, your invoice will return to normal.
If standing charges or unit prices appear higher, a credit may be added to reflect our price guarantee and offset those differences.
If you're unsure about anything on your bill, we’re here to explain.
Tips to Ensure Accurate Billing
Submit monthly meter readings if you’re on a metered energy tariff.
If you don’t, industry-estimated readings will be used.
This can impact your payment accuracy — so regular submissions are best!