Gas supplier Firmus Energy is cutting prices for its customers in Derry by more than 20% from next month.
That will mean a typical annual household bill will fall by £135.
The Firmus 'Ten Towns' network supplies about 50,000 customers. The firm also has a network in Belfast that will be subject to separate price announcement.
Firmus said the main reason for the price cut is a significant decrease in wholesale gas costs.
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