The main component in Ofgem’s calculations was a more than doubling of wholesale electricity and natural gas costs. These account for about 70 percent of the new price cap.

Coping with increases of such magnitude is beyond the scope of Ofgem, whose role is to protect consumers from profiteering by suppliers, Mr. Brearley said. “The truth is this is beyond the capacity of the industry and the regulator to address,” he added.

Looking to the race for the next prime minister, Mr. Brearley called on the winning candidate to intervene decisively in the energy markets.

“What I am clear about is the prime minister with his or her ministerial team will need to act urgently and decisively to address this,” he said. “The outlook for the winter without any action looks very difficult indeed.”

The leadership contest has been dominated by Ms. Truss’s promise to cut taxes, which is popular with the rank-and-file Conservative Party members who will vote for the next prime minister. But economists say it will do little to protect the most vulnerable people from the ravages of soaring energy bills.

With another hefty price increase looming in October, the public outcry over energy costs is likely to haunt the next prime minister. Unless the government develops an effective response, some analysts said, the issue could cripple the government and tilt the next election to the Labour Party.

The peculiar nature of Britain’s price cap system, analysts said, also amplifies the sticker shock from rising increases.

“We have a sort of worst-of-both-worlds system,” said Jonathan Portes, a professor of a professor of economics and public policy at Kings College London. “Household prices are related to the spot market, and we sort of save up price increases and dump them on households all at once.”

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