How the Ofgem energy price cap works

How the energy price cap worksAn explanation of Ofgem's wholesale allowance methodology — observation windows, the 3-1.5-12 hedging approach, baseload and peak shaping, and backwardation. The page itself is prose and diagrams rather than a dataset; the wholesale prices it draws on are published at /data/wholesale-prices.html.Researched, built and maintained by Ben James, an independent energy analyst. Cite as: Ben James, GB Electricity Bills, https://www.electricitybills.uk.Every dataset, without JavaScript

/llms.txt — summary of the site, its datasets, key figures and definitions.

/data/ — index of all tables and CSV downloads.

Bill breakdown by component (CSV) — annual cost of every component of a GB household electricity bill since financial year 2015-16.

Wholesale electricity and gas prices (CSV) — daily GB day-ahead power and gas prices in £/MWh, nominal and CPI-adjusted, updated each weekday.

2030 bill forecast (CSV) — component-by-component projection to 2030.

Pages on this site

Bill breakdown — a household bill split by component, by financial year.

Wholesale monitor — daily and half-hourly GB wholesale electricity prices, gas prices, intraday price shape and the gas–electricity linkage.

2030 forecast — where each component of the bill is heading.

How the energy price cap works — Ofgem's wholesale allowance methodology: observation windows, the 3-1.5-12 hedging approach, shaping and backwardation.

AR7 cheat sheet — how Contracts for Difference work and what Allocation Round 7 means for bills.