The 5% reduction in prices for British Gas customers kicks in today.
The Big Six supplier initially made the announcement last month, with the move expected to save consumers £35 on their gas bills.
Nearly seven million customers will benefit from the price cut. It follows a previous 5% reduction in February.
However no other major suppliers have made further price cuts yet.
Ann Robinson, Director of Consumer Policy at uSwitch.com said: “With wholesale energy prices at a five-year low, suppliers who are refusing to reduce bills further have a lot of explaining to do.
“A second wave of cuts will not only help cash-strapped consumers but would also be an olive branch signalling the industry’s commitment to rebuilding trust and confidence with its customers.”
However she claims there is still a £320 a year difference between British Gas’ standard tariff and the cheapest deal on the market and suggests customers to switch suppliers.