Firmus Energy has announced its gas price will decrease by almost 20% from next month.
The move comes as global wholesale gas prices continue to fall.
Firmus Energy, which has about 110,000 customers across Northern Ireland, cut its prices in January.
Those in Greater Belfast will see prices fall by 22.43% from April.
That will save customers in the Ten Towns £335 a year and those in Greater Belfast £433 a year on average, according to Firmus Energy.
Firmus Energy Chief executive, Niall Martindale, said: “We previously committed to our customers that as soon as market conditions allowed us to lower our prices we would do so.
“We recognise the wider cost-of-living challenges within the communities we serve and at Firmus, we are working hard to make positive change for our 110,000 loyal and valued customers.”
The government is subsidising energy bills through the Energy Price Guarantee, which reduces the amount people can be charged for each unit of gas by 3.893p/kwh until the end of March.