Britain's biggest energy suppliers have been contacting customers about a minimal price change starting in the new year, the BBC has learnt.
Major energy providers have told the BBC that they are making changes to their prices per unit from 1 January.
But the alterations are likely to only add pennies, not pounds, to bills.
The government says a typical annual bill for a household will still be ?2,500, but the maximum rates suppliers can charge per unit are being updated.
Receiving news of a price change has worried many customers, at a time when prices have already increased dramatically and many find bills difficult to understand already.
The changes will affect the 12 energy "regions" across Britain from the start of January and means suppliers are allowed to put their prices up to those new maximum levels for gas and electricity.
The biggest changes are for customers paying in monthly or quarterly bills for their energy. Prices are increasing in all of the 14 areas for both gas and electricity with the biggest changes being for those in
North Wales and Merseyside, as well as in London, which are both increasing for electricity by more than 1p per kWh.
Which suppliers are making the changes?
Scottish Power, Bulb, EDF, British Gas and Shell have all confirmed to the BBC that they would be passing on the changes allowed by the government in full to customers.
Octopus said it would pass on cuts, but not rises, to customers. The company said it would absorb the increases, except for "Economy 7" customers. EOn is making changes to direct debit and billed customers, but not increasing rates for prepayment customers.
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https://www.bbc.co.uk/news/business-64063568