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New legislation to free people from “rip off” energy tariffs should be operating next winter, a move which would protect 11 million customers.

The law will allow energy regulator Ofgem to limit how much companies can charge customers for their standard variable tariffs.

The government is under pressure to ensure that the measure is ready for the next cold spell. Trade body Energy UK said it was vital the cap did not stifle competition.

The government said the Domestic Gas and Electricity Bill, which is being introduced to Parliament on Monday, should be implemented by Ofgem “as soon as possible so that customers get the protection they need by the end of this year”.

Rachel Reeves, who chairs the Business Committee in the Commons, said: “Energy consumers have been overcharged for too long and the government now needs to quickly ensure this legislation is passed in time to protect customers next winter.”

The law will limit the cost of firm’s standard default tariffs until 2020. Following that, the cap may be extended on an annual basis until 2023.

One million households who get the Warm Home Discount saw an energy price cap introduced in February – an extension of the cap already in place for prepayment meter customers. This will also apply to another two million vulnerable households next winter.

When customers’ fixed-term deals end they usually automatically move to this tariff, which applies to 11 million households. Ofgem says the price difference between the average standard variable tariff default deal and the cheapest rate in the market was £308 at the last count in December.

It is moving to introduce legislation to cap these variable tariffs, overseen by Ofgem. This will not take effect until the law is passed. The government wants it done by the end of the year at least.

Some suppliers are moving towards abandoning variable tariffs. Ofgem has also changed the rules to allow suppliers to default customers on to another fixed deal. Customers are still likely to be better off by searching and switching themselves.

Prime Minister Theresa May said: “It’s often older people or those on low incomes who are stuck on rip-off energy tariffs, so today we are introducing legislation to force energy companies to change their ways.”

The move is an admission that encouraging consumers to regularly switch providers to pay less has not been as successful as hoped.

About a third of households are charged a variable price for their energy at a default rate set by their energy company, because they have not chosen to shop around for a cheaper fixed-price deal.

The Department for Business Energy and the Industrial Sector said that the energy market was not working and that domestic customers of the “Big Six” energy companies were paying on average £1.4bn a year more than they would in a truly competitive market.

“We’re going to give powers to Ofgem to make this energy market work for everybody by winter 2018, to set a maximum absolute cap [to be] paid by customers on standard variable and default tariffs, the tariffs that the majority of households are on and sometimes don’t even know it,” the Energy and Clean Growth Minister, Claire Perry, told the BBC’s Today programme.

The Business Department says the average annual savings between standard tariffs and fixed rate deals could be up to £300.

The changes are separate from Ofgem’s safeguard tariff, which is already helping some five million vulnerable customers pay lower prices.

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