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Customers of JT will see a rise in their bills from next month after the cost to provide services increased "significantly".
From 27 March, prices will be going up by 7.5% by Jersey and 6.3% in Guernsey, in line with the latest inflation figures.
The new charges will be rounded up to the nearest 10p.
JT said on its website that it was "continually" investing to improve its services.
The network said that it was "committed to keeping our prices as low as we can and minimising the amount we pass on to our customers", but noted that "the costs of providing services have however increased significantly".
Islanders have been hit hard by cost-of-living rises over the past year, and the Consumer Council said the latest news will "no doubt be worrying for some consumers".
Pictured: Islanders have been hit by numerous cost-of-living rises over the past year.
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, and Islands Energy put Jersey prices up by the same amount.
Many customers will have seen a double-digit rise in water, with bills increasing by 10.9% in January.
Jersey Dairy confirmed last month 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.
DIGEST: Cost of living still going up... but less aggressively
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