Canadian Politics Today

You are right, the costing does not include backup power:
LCOE as a measurement does not take into account some external costs, like storing solar power for cloudy days, which is one of the lingering obstacles preventing the widespread adoption of solar.

I think we'll be using a mix of sources feeding the grid for a while, so backup isn't an issue now and technological inprovements will take care of it in the future.

I am sure we will be using a mix for a long time to come but that mix will teeter toward renewables as more are developed and come online. We'd have to be rather stupid to continue simply drilling holes in the ground to try to find more pollutants to keep the lights on while the sun gets up every day.