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,

Ontario’s leader said he will add a 25% export tax on electricity sent to New York and other states in retaliation for Trump’s tariffs. Ontario provides 2,500 of the 4,600 megawatts of capacity that New York draws upon from Canada, the NYISO reports.

Ontario, a Canadian province bordering the United States, has announced plans to impose a 25 per cent export tax on the electricity it supplies to three US states if President Donald Trump’s administration continues to impose sweeping tariffs on Canadian goods.