Jul 2025 – Jun 2026
12-Month Forecast
Forecast by Grandma · updated today
All 12 months
Oct 2025 — Price cap alert
Ofgem's October price cap increase pushes your estimated bill to £167.
Grandma
The price cap is expected to rise around 13% on 1 October. Here's what that means for you.
Your forecast moves from £134/mo to £167/mo in October, with an expected range of £148–£189. Aunty Sarah handles switching timing if you want to act on this.
See Aunty Sarah's recommendation12-month estimated total
£1,829
Average £152/month · estimated range £1,618 – £2,065
Scenarios
Tap a scenario to see its assumptions and month-by-month breakdown.
~60% likelihood · Medium confidence
Based on your usage history and Ofgem's October price cap.
- Typical South West winter temperatures
- October price cap rises around 13%
- Usage in line with your last 12 months
Month by month · tap a month for detail
What could change this forecast?
Weather
A colder-than-average winter can add £15–£30 a month to heating costs.
Household usage
New appliances, working from home or more occupants shift your base load.
Ofgem price-cap changes
The cap is reviewed quarterly; each review moves unit rates and standing charges.
Tariff changes
Coming off a fixed deal, or switching to one, re-bases every month after it.
Government policy
Levies, VAT changes or support schemes can raise or lower the bill directly.
These figures are estimates based on sample data for this prototype.