Compared to current costs, yes. Power consumption will be closer to supply production curves instead of demand curves. Peak production is a massively burdensome level of production that requires significant over-engineering. It often requires significantly less efficient and costly technologies to be used. often times resulting it significant maintenance costs.
Yes, since to migitgate the worst of the climate catastrophe we'll have to get off fossils for electricity generation, and then we're dealing with supply peaks and through, instead of demand peaks and throughs.
so yes. it would still be lower.