Karen is a business reporter.
Cornwall Insight predicts that energy bills will go up to over $4,300 by January of next year.
It has increased its estimate for households in England, Scotland and Wales by more than $600.
Cornwall said that the price cap was changed every three months instead of six because of higher wholesale prices.
No forecast for next year could be "robust", according to Ofgem.
The higher estimate means that the average household will see their bills go up to £355 a month at the start of next year.
The government rejected calls for more help on energy bills until a new leader is in place. The business lobby group said it made no sense to wait for a new Conservative party leader to be elected.
It was up to the new leader to decide on further aid for households.
Cornwall has increased its prediction for this autumn's typical domestic energy bills to 3,582, up from its previous prediction of 3,358.
The wholesale market is so fast that no forecast for next year is robust at this stage and will therefore have very limited value, especially for consumers who must always be the main priority.
We can't stop others from making predictions, but we would ask for extreme caution if they made predictions for the price cap.
Dr Craig Lowrey, principal consultant at Cornwall said its price cap forecasts had been steadily rising but the big jump in its forecasts came as a surprise.
The cost of living crisis was already top of the news agenda as more and more people face fuel poverty.
In order to help with rising fuel bills this autumn, households in England, Scotland and Wales will receive an amount of money in six equal payments.
Dr Lowrey wants the government to use the predictions of higher bills to review the support package for consumers.
If the $400 wasn't enough to make a difference, it's not enough now. The government needs to introduce more support over the first two quarters.
Sylvia Simpson said that there had been a 400% increase in people asking for advice from the charity due to the rising cost of living.
She said there weren't many options for people to help them with their energy bills. It's not possible to switch to get the best deal. people are struggling
She said that they are looking forward to October. The people who are coming to see us don't have enough money in October to deal with the increased fuel supply. It's time for the government to do something.
Sunak said he would give more money to help people with their energy bills if he became prime minister.
He said he would act when he knew how much bills would go up. Liz Truss wants to cut taxes to help people who are hit by cost of living increases.
The energy price cap rise in October should be scrapped because it will save the average household over a thousand dollars, according to the leader of the Liberal Democrat party. The plan could be funded by retroactively taxing oil and gas companies' profits.
More energy suppliers might be in danger of collapse if the price cap isn't changed more often, according to Dr. Lowry.
"If it is not controlling consumer prices, and is damaging suppliers' business models, we must wonder if it is fit for purpose," he said.
The changes to the price cap could result in better news for households in the last six months of the year.
He said the shake-up to the price cap should result in lower bills in the second half of next year.
The typical household should see an increase in October of £800, according to Ofgem.
The energy price cap limits how much can be paid for each unit of energy.
Energy suppliers pay producers for electricity and gas
The war in Ukraine has caused this to rise sharply.
The UK's inflation rate is at the highest in 40 years and many families are facing soaring costs.
The Don't Pay group says tens of thousands of people have pledged to stop using direct debits from October 1st.
Consumers who don't pay their energy bills can be threatened with disconnection and have their credit rating damaged.
The wholesale prices suppliers have to pay spiked due to a fear of Russia withholding gas supplies, as predicted by January energy bills.
There is a technical change that has caused those estimates to jump by 10% in a few days.
Suppliers are having to pay a higher price to meet the needs of their customers. Customers who are under the cap may be paying less.
Suppliers will be able to recover extra costs from customers over the course of six months, a shorter period than before.
It's not just about protecting profits, 28 suppliers have already folded in the last couple of years, leaving customers to pick up a tab of over $2 billion. Over $1 billion of taxpayer funds are expected to be needed to deal with the collapse of Bulb.
Customers are supposed to be protected from future failures. It could mean terrible choices in the depths of winter.
The increase in the estimate unveiled today is unlikely to be offset by the additional help currently on offer.
The changes to the price cap were necessary to reflect suppliers' wholesale energy costs and to help avoid more supplier failures, according to Cornwall.
The change ini methodology should result in lower bills in the second half of next year if prices remain the same. The need for support for households who will struggle to pay their energy bills this winter is underscored by the new forecasts.
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