If Ottowa pull the electrical plug it will likely bankrupt them. From what I have read selling electricity to USA is their major income stream.
As for oil. Years ago Canada was going to build a pipeline that traversed the country West to East. It would supply oil from the oil rich western provinces to Quebec which has no oil, The TransCanada East Coast Project. They did not build it and so the pipeline still runs down to the US where it is redirected up another pipeline to supply Quebec. Canada is not in a good bargaining position.
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