Gas supplier Firmus energy has announced its prices will increase by more than a third in its Ten Towns Network.
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The 33.57% increase will take effect from 24 February 2022, and is the fourth increase by the company since last spring.
The Utility Regulator said it would bring the average household gas bill in the Ten Towns area to £1,293 a year.
In April 2021, the average bill was £518.
The move will affect about 55,000 customers in the Ten Towns area, which includes Antrim, Armagh, Ballymena, Coleraine, Craigavon, Londonderry and Newry.
Dr David Dobbin, chairman of Firmus Energy, said the company had no choice but to make a further increase due to the sustained high prices in wholesale gas markets.
"Very low gas stocks, reduced Russian supplies and concerns about the Ukraine situation are all combining to keep European gas prices high," he said.
"The market crisis has been well publicised, and markets look increasingly like they are going to remain high for some time."
It was not just a Firmus issue, but a challenge by every local and national supplier of gas and electricity, he added.
"Regrettably, we, in Northern Ireland, are at the mercy of the global wholesale gas market and are unable to influence these prices," he said.
"We know this is another unwelcome increase which will have a disproportionate effect on those of our customers who are the most vulnerable."
He said the company had been providing financial support to a Department for Communities scheme to help those in need.
The Utility Regulator previously warned that gas prices would increase in the coming weeks.
The wholesale price of gas makes up more than half of consumers' bills.