By the Maritime Link project (HVDC), which finished this year, Newfoundland is linked asynchronously to Nova Scotia, which is part of the Eastern Interconnection.
closed as off-topic by Andy aka, Chris Stratton, Voltage Spike, DoxyLover, Warren Hill Jul 28 '18 at 9:48
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No, the Quebec's grid is isolated from the rest of the North American continent. This is due to the historical decision to make sure that Quebec is 100% independent in terms of energy production. This also mean that Quebec is capable of rebuilding its network in case of a total black-out because Hydro-Quebec regulate the voltage of its grid and the frequency.
The only interconnection between Newfoundland and Labrador and Quebec is the DC interconnection for Churchills Falls dam.