For more information on energy visit our energy information page.

“Big 6” means the six major energy companies who currently supply over 98% of UK households, comprising: British Gas, E.ON, npower, EDF (London Electricity, Seeboard and SWEB), Scottish Power and Scottish & Southern Energy.

Guarantees and price comparisons are based on the standard domestic usage profiles for low, medium and high users on a like-for-like basis and exclude Club membership fee, surcharge for gas customers using an Independent Gas Transporter, Dual-Fuel discounts and online tariffs. Only applies to direct debit customers. During periods when retail prices are changing, we typically announce our new prices after most of the “Big 6” have set their new prices in order to ensure our new prices are competitive and in line with our “Triple Value” guarantee. Therefore when energy prices are falling, there may be a short period before our new prices take effect when our prices may be higher than those available from certain other suppliers. The reverse will however generally be true during periods when energy prices are rising.