Mixed feelings on this one.
One: Manitoba has had a competitive advantage over its neighbours due to a fluke in geography -- big rivers running to the coast through MB. This competitive advantage doesn't exist for wind or solar which could be installed anywhere. Assuming MB can just install more capacity and continue to use hydro to bankroll everything is wishful thinking at best.
Two: the competitive advantage might actually be the dams, in that they can be spun up or down to handle surges in demand.
Three: I don't mind hydro buying from private players provided that hydro isn't obligated to should those private players refuse to play nice. This only works if private players are generating a small fraction of the total power. It could allow for some innovation.
Four: I am wholly opposed to tbe privatization of hydro. Grids are critical infrastructure and critical infrastructure should be publicly owned.