Firmus Energy has announced a rise in gas prices of almost 25% for customers in the Belfast area.
This 24.54% increase will be in place from 01 July.
Sinn Féin MP Paul Maskey has described the news as "another blow for workers and families".
Paul Maskey said: "People need our help now. Infighting within the Tory party and giving cover to the DUP to block an Executive being formed will not cut it with people who cannot heat their homes.
"Sinn Féin is ready to form an Executive today to start putting money in the pockets of workers and families who simply cannot cope with another rise in prices.
"I would urge the DUP to listen to people, end the boycott of government and join with the rest of us to support people."
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