MrAmerica: Assuming the excess power can be sent north, it could be a good opportunity to wind down coal and gas generation, although I have no idea about the intricacies of power generation and load demand.
I wonder if the Govt has a plan B?
We already sit between 80-90% renewable energy generation most of the time (the overwhelming majority of which is hydro from down South), it's not really feasible to completely remove coal/gas. Renewable sources are mostly at the mercy of predictable, but not entirely controllable or storable energy (wind, sunlight, rainfall etc). Hydro is the best at this, but we can only store so much water or replenish it from rainfall.
We still need sources of generation which essentially have a power dial, to go up and down as the system requires. Until we have massive battery farms, or any other way of storing excess energy and releasing on-demand really, it's the best we have.