The government will detail later how it intends to force energy firms to offer customers the lowest suitable tariff.
Ministers want to ensure that customers get the lowest tariff that is suitable for them.
The major energy companies have faced fierce criticism in recent months, as gas and electricity bills have soared.
Angela Knight, of industry body Energy UK, said that she was "expecting this" move from the government, where energy companies will have to regulate the number of tariffs that they offer.
Ms Knight told Today presenter John Humphrys that some of the cheaper tariffs that are currently available may disappear:
"That is a risk because until we see the detail we don't precisely know what it is that is being proposed," she said.
"But certainly it is the case that if you have restrictions and restraints then you can't offer everything and you can't offer the variety of choice that you get offered at the moment."
When questioned on whether the UK public will be paying more for their energy, she answered "I don't know and nor does anybody", but insisted that consumers would be paying "the best prices that are available".
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