One of the UK's largest energy suppliers, EDF Energy, has said it is to cut its gas bills by 5% from 7 February.
The move follows a sharp fall in the price of wholesale gas over the winter period due to the mild weather.
EDF increased its gas bills by 15.4% in November in response to rising wholesale gas prices.
The move to cut bills is the first by a major supplier and is likely to be followed by other energy companies.
The company did not announce any cut to the price of its electricity bills, which rose by 4.5% in November.
"What customers want more than anything else is fair, clear and transparent prices. We know they want action rather than words. That is why we are the first major supplier to announce a cut and were the last to increase prices," said Vincent de Rivaz, chief executive of EDF Energy.
The company said that the wholesale price of gas had fallen 9.2% since it announced it was putting up bills on 10 November last year.
EDF has been one of the most active in marketing price changes. It was the last of the six major suppliers to cut prices this autumn. Last winter, it held its prices until March amid widespread price rises.
However, the price cut comes as an annual customer satisfaction survey carried out by the consumers' association Which? showed EDF second bottom of the "big six" energy suppliers.
Now the pressure is on for the rest of the major suppliers to follow suit”
End Quote Richard Lloyd Which? executive director
In all, 43% of customers said they were satisfied with the company's service or likely to recommend it to others.
Of the big six suppliers, only one, Scottish and Southern Energy, received a score of more than 50%, getting 51%.
Richard Lloyd, Which? executive director, welcomed EDF's upcoming price cut.
"Now the pressure is on for the rest of the major suppliers to follow suit. But as our survey today shows, there remain huge problems with customer service in energy as well as high prices," he said.
This report suggested that, when customers had gripes about their energy company, some 90% of unsolved complaints were not taken to the energy ombudsman for resolution.
The ombudsman can get involved if the complaint has been outstanding for eight weeks, or if the supplier sends a letter saying the two parties are in deadlock.