Npower has become the fourth major UK energy supplier to announce a reduction in its gas price - with a 5.2% cut taking effect on 28 March.
The date of the change is likely to bring renewed criticism that prices are cut only towards the end of the coldest months.
The move will mean a £32 average annual cut to customers on a standard domestic gas tariff.
Npower said the fall would benefit about 1.2 million customers.
