Cost of Sales Index: September 2026
£1,552a year
up 6.7% on last month
1Y fixed dual fuel · GB avg
Cost of Sales Index
What did it cost?
What it cost to buy and deliver a typical home's Elec and gas in September: the energy, the networks and most government schemes, before supplier overheads, margin and VAT. That is £32 below the Ofgem cap of £1,584 on the same basis, the room left for a supplier's costs and margin.
What moved it?
Up on August, as wholesale gas and Elec rose through the month.
Where is it lowest and highest?
| Region | £ | vs lowest |
|---|---|---|
| East Midlands | £1,501 | Lowest |
| London | £1,526 | +£25 |
| Eastern | £1,531 | +£30 |
| West Midlands | £1,531 | +£30 |
| Norweb | £1,537 | +£36 |
| Southern | £1,545 | +£44 |
| South West | £1,560 | +£59 |
| Northern | £1,561 | +£60 |
| South Eastern | £1,561 | +£60 |
| Scottish Power | £1,562 | +£61 |
| Yorkshire | £1,562 | +£61 |
| South Wales | £1,563 | +£62 |
| Scottish Hydro | £1,567 | +£66 |
| Manweb | £1,626 | +£125 |
We recompute this every trading day.
See today's indexQuestions about this figure? hello@energycode.ai