Households have been urged to send meter readings to their energy supplier before Ofgem's lowered price cap come into effect on Saturday.
From July 1, the average energy bill is set to fall by £426 a year when the price cap is dropped amid decreasing wholesale prices, reports Wales Online.
Households should submit meter readings before midnight on June 30 to ensure they are paying the lower prices as soon as they come into effect.
Ofgem will be cutting their price cap from £3,280 to £2,074 from July 1, which will mark the first time households on default tariffs will see their prices drop for more than 18 months.
The latest cut from Ofgem means that the cap will again govern household bills and will result in an average reduction of £426.
In order to keep your energy bills accurate, it's wise to send in a meter reading will stop the consumer's supplier from estimating their usage and potentially using the old higher prices on energy that is used after June 30.
Those who cannot submit readings for whatever reason before June 30 should do as close to the deadline as possible - and keep a time-stamped photo for proof.
The energy price cap is there to set a limit on the maximum amount that energy suppliers can charge their customers for each unit of electricity and gas. The headline price cap is an average across households, rather than an absolute cap, so that those who use more energy do end up paying more.
Many consumers have been shielded by the most recent price rise by the Government's Energy Price Guarantee (EPG) - which capped annual costs to £2,500.
Gareth Kloet, energy spokesman at the Go Compare deal comparison site, said: "This drop will come as a very welcome relief for many households who have been struggling to pay their energy bills in the past year.
"If you compare energy prices with winter 2021 – when the price cap was set at £1,277 – the past 12 months have been a huge struggle for many, so this weekend’s drop is definitely a step in the right direction.
He added: "However, it’s important that you take a meter reading so that you can make the most of the price drop," he added.
"By taking a meter reading on June 30, before the price drop comes into force, it will mean that your energy company cannot charge you at the higher rate for any units that have been used after that date."
Simon Francis, co-ordinator of the End Fuel Poverty Coalition, said: "As the new price cap comes in for most households, customers are still going to be paying roughly the same for their energy as they did last winter.
"And after months of inflation and the wider cost of living crisis, people are even less able to afford these high energy bills.
"The Government needs to use the summer to fix Britain’s broken energy system, because for millions of people the energy bills crisis is far from over.
"This means ramping up energy efficiency programmes, introducing a Help To Repay scheme to deal with the record levels of public energy debt and reforming energy pricing arrangements so that the benefits of cheap renewable energy are passed onto households."
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