EDF has launched the cheapest fixed energy tariff of the major suppliers – but the countdown is on as you have just hours to sign up for the deal.

The energy supplier's one-year fixed tariff launched yesterday and is only available until 4pm today (Wednesday 20 May 2026).

The tariff sits at £1,689 annually for the average household paying by direct debit. 

This is higher than the current price cap of £1,641 but lower than the latest predictions for July's price cap.

Cornwall Insight, the independent energy forecaster, predicts the cap will rise to £1,850 from July. EDF's own prediction puts the upcoming cap at a similar £1,847.

Both existing customers and new customers can sign up for the deal directly through EDF.

Keep in mind that the price cap and fixed tariffs don't limit your total bill. Instead they set the maximum that suppliers can charge per unit of energy. If you use more, you'll pay more than the quoted annual price.

It's worth considering the EDF tariff if you're keen to have certainty over your bills for the next year – and you prefer well-known names over smaller suppliers.

Providers such as Outfox Energy, Fuse Energy and Ecotricity have consistently topped the table of the cheapest fixed tariffs over the last 12 months.

The conflict in Iran has caused ongoing volatility in the energy market and we've seen suppliers introduce tariffs that are then withdrawn and repriced as events unfold.

Cornwall Insight's prediction for the upcoming price cap is the final one before the energy regulator Ofgem confirms it on 27 May.

The forecaster doesn't expect a fall back to the current level of the cap even if the conflict in Iran ended tomorrow, due to the damage to infrastructure and the 'lingering effect' of disrupted supply.