British Gas and EDF Energy have become the last of the Big Six suppliers to cut gas prices.
British Gas said around 6.8 million customers would see a 5.1% reduction from 16th March.
That would lead to an average saving of £31 on their gas bills.
Mark Hodges, CEO, Energy Supply & Services, UK & Ireland, said: “British Gas was the only major supplier to cut prices twice last year, ensuring customers’ bills were lower through the winter.
“Taken together, our three price reductions will bring the average household’s annual energy bill down by almost £100.”
EDF Energy swiftly followed, announcing a 5% reduction, which will come into effect from 24th March.
It claims around 900,000 of its customers will benefit from the price cut, reducing the average gas bill by £31.
Managing Director of Customers Beatrice Bigois said: “We are pleased that we can reduce customers’ gas bills for the second time in just over a year.
“Our prices are under constant review and today’s announcement reflects falls in wholesale gas costs. There are other costs impacting customers’ energy bills that are beyond our control – these increased steadily during 2015.”