Transportation won't need that much power to completely electrify. A couple Site C's at most. Going from gas or diesel to electric also comes with a big jump in efficiency.
Switching gas heated buildings to electric on the other hand is a MUCH larger load. Like 5-7x Site C's output.
The peak output of the generators also isn't that significant. Hydro needs to have water in the reservoir to make power, so only so much can out of a given plant in a year due to the available water resource, regardless of the generators rated peak power. Even if there's 18 GW of peak capacity available, it's not like you can count on it being available.
BC actually is actually a net importer of power currently, so we definitely could use more generation here, but it's not like adding a few trains in the mix would change much.
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