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Energy regulator Ofgem has responded to claims that customers will spend more money on their energy bills following confusing changes to tariffs.
An Ofgem spokesman said that Ofgem's reforms will deliver a "simpler, clearer and fairer energy market for consumers", making it easier for them to choose the right deal for them.
Around 500,000 low energy users, who tend to be on the lowest incomes, could be advised on the wrong tariffs, under new proposals by Ofgem, Which? said.
New Ofgem proposals could see consumers pay an extra £55 million for energy bills, research has found.
Energy tariff reforms could lead to higher costs for more than 3.4 million households, as they struggle to identify the cheapest energy tariffs, research by Which? said.
The proposed tariff comparison rate (TCR) aims to simplify energy tariffs, allowing consumers to compare tariffs across the market.
Consumers will be advised on their best deal based on medium usage of gas and electricity, but only 26% of consumers use this level of energy.
Which? said as a result three quarters of customers will be directed to tariffs unsuitable for them.