Experts have predicted a sharp rise to the energy price cap in October.
The price cap, which limits the rapes a supplier can charge for gas and electricity, rose on April 1 from £1,277 to £1,971.
Cornwall Insight reckons this could further increase by £1,388 to hit £3,359 later this year.
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Now Martin Lewis' website, MoneySavingExpert, has updated its latest guidance on energy bills.
The price cap currently covers 22million households.
And at the moment, there are no open market fixed-rate energy tariffs that are cheaper than the current £1,971 price cap.
Martin's website explains that on average you'll be paying 72% more over the next year than you do now, based on predictions.
MSE suggests fixing into an energy deal if you're offered a one-year fix at no more than 70% above your current price cap tariff.
He said: "This isn't an exact science – do watch my video explainer from a couple of months ago if you want to understand more."
"Fixing below this point is still not a slam dunk, I can't promise I've got this right, there are too many unknowns…"
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He added: "This is my best-guess with the information I have at the moment."
The cheapest rates are normally "customer-only" deals which aren't available on the open market.
It's worth speaking to your energy provider to see what deals they have on offer right now.
MSE flagged the E.on Next: Next Online v17 one-year fix as being 67% more than the current price cap (£3,297 a year).
The cheapest open-market rate is from Utility Warehouse, but you'll have to take out other products too.
Its "Green Fixed 33" one-year fix is on average 45% more than the price cap at £2,850 per year for typical use.
To get access to this fix, you will need to take out broadband, SIM-only mobile contract or boiler and home cover with Warehouse.
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