The US isn't buying power from the Canadian government. They can't just "shut of the power" to the US because we are upset with them.
Customers in the US are buying power from Canadian companies. Sure, the Canadian government could declare the US an enemy and force the companies to shut off the power, but then those companies would need to be compensated. And those US customers could pursue legal restitution under USMCA, WTO, etc.
Not only that, but what would the Canadian power companies do with the excess capacity? It would be a double whammy for the Canadian economy.
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