UK energy prices autumn 2026: the Ofgem cap and what it means for CPI
The Ofgem energy price cap reset on 1 October 2026 will affect CPI through Q4 2026 and into 2027. We explain how the cap works, what the autumn change means for the inflation outlook, and how to read the energy component of UK CPI.
Frequently asked questions
Does the energy price cap directly set what I pay for energy?
The Ofgem energy price cap sets a maximum unit rate and standing charge — it is not a fixed annual bill. Your actual bill depends on your actual consumption. The cap protects against the highest tariffs but does not guarantee a specific total bill.
Why does CPI measure energy prices differently from what consumers see on their bills?
The ONS measures the price of a fixed basket of goods and services month-to-month. For energy, it samples actual tariff prices — primarily the Ofgem capped unit rate. Actual household bills can differ because usage varies and some consumers are on fixed tariffs. The year-on-year rate compares today's price to the same month last year — so a cap that rose in Q4 2025 creates a reference point that affects Q4 2026 comparisons.
How far ahead does Ofgem set the energy price cap?
Ofgem announces each quarter's cap typically 2–3 months before it takes effect. The Q4 2026 cap (effective 1 October 2026) was announced in late August 2026. The January 2027 cap will be announced in late October 2026. Ofgem bases its calculations on wholesale gas prices over the preceding months.
Sources
- 01 Ofgem — Price Cap Q4 2026 announcement Aug 2026
- 02 ONS — Energy Price Statistics, UK, 2026 Oct 2026
- 03 BEIS — UK Energy in Brief 2026 Oct 2026
This story reports official statistics as published. It is reference information, not financial advice or a forecast.