Households in Jersey can expect to have around £13.80 extra per month added to their gas bills.
Islands Energy this morning announced a 12% hike in prices from the end of this month in Jersey.
Guernsey customers, meanwhile, are facing a rise of 8% – putting an extra £8.30 on the average household bill.
CEO Jo Cox, who pledged to review the prices in six months, said the utility company was "fully aware of the challenges that many households are facing with rising prices across the board".
However, she said that IEG felt the prices "truly reflect the cost of gas we supply to our customers", noting that tariffs had been frozen for a year and that the firm had faced "inflationary pressures on operating and importation costs".
Many customers affected by last year's gas outage are still awaiting details of what "goodwill payments" they might receive.
Ms Cox added that IEG was "working closely" with the Governments of both islands "to ensure they are fully up to date on the situation and that they are able to offer support where they can". She urged anyone struggling with their bills to get in contact with the company.
Customers have been hit hard by cost-of-living rises over the past year – and in particular in recent months. The last rise was around 10%.
Retailers warned that Condor's decision to put up freight prices at the start of 2024 would end up being reflected in prices for customers and suppliers.
JEC warned electricity customers last year to brace for a 12% rise.
Many customers will have seen a double-digit rise in water, with bills increasing by 10.9% this month.
Jersey Dairy confirmed last week that there would be a rise in the wholesale price of milk of 7p.
While fuel duty has been frozen for 2024, alcohol duty has risen this year following the approval of the Government Plan.
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