Chief executive Paul Massara said he wanted to get the benefits of reductions in the wholesale market to customers “as soon as possible”, claiming the cut will save them up to £35 per year.
The supplier said it would “keep things under review” to see if additional cuts could be made in the event of further falls in wholesale gas prices.
Last week, Eon became the first of the big six energy companies to cut its gas tariff by 3.5 per cent with immediate effect.
British Gas and Scottish Power followed suit earlier this week, announcing they would slash their gas bills by 5 per cent and 4.8 per cent respectively. However, cuts for both companies won’t come into effect until the end of February.
On Wednesday, Ecotricity cut its tariff by cut its gas bills by 6.1 per cent from 1 May 2015.
SSE and EDF Energy have not yet announced a cut to their energy tariffs.
Ann Robinson, director of consumer policy at price comparison website Uswitch.com, said the price cuts are a “small step” in the right direction.
However, with wholesale gas prices falling for months on end, cuts so far seem “token gestures” and consumers are still not getting a “fair deal” this winter.
She also argued that, with wholesale electricity costs down, it’s “high time” for reductions on standard electricity tariffs.