President Donald Trump backed down from an extraordinary trade war escalation Tuesday that had threatened a massive surge in Canadian steel and aluminum tariffs and new tariffs on Canadian electricity.

The latest skirmish in U.S. President Donald Trump’s trade war is highlighting how the Canadian province of Ontario provides electricity to some American homes and businesses.

Trump said he would increase from 25% to 50% tariffs taking effect Wednesday for Canada after Ontario said it would hike electricity prices in the U.S.