Swelling U.S. power prices may rise even faster in some parts of the country if 10% energy tariffs imposed by the Trump administration this week hit Canadian electricity supplies and trigger retaliation, according to energy experts and grid operators.

The U.S. imports about 1% of its total power needs, according to government data, but New York state and regions like New England rely much more heavily on electricity generated in Canada, meaning they could soon be delivering higher bills to utility customers.

Ontario Premier Doug Ford, meanwhile, told media outlets this week that he was prepared to halt the transmission of electricity from his province to the U.S. - something that could crimp supply and drives prices even higher.

The U.S. is a net importer of Canadian power, buying 2,700 gigawatt hours last year, or about 50% more than it sold to Canada, according to EIA data.