You posed the question in terms of how we will double the grid in 12 years. There's no need to double the grid in 12 years. It's going to take 30 years or more to transfer all those end uses that are presently met by fossil fuels, or to transfer many of them—not all of them, because some will be met by hydrogen and other clean fuels—to the electricity grid, so you don't need to double the grid in 12 years. What you need is to decarbonize the grid over the next 12 to 15 years, or whatever it is, and incrementally add to it clean technologies.
Twenty years ago, the question you are posing would have been completely right on. Today we know the technologies that can do it, and there are other countries that have proven some of the ones that are not yet deployed in Canada. Storage, all the panoply of renewables.... We know how to make electricity without fossil fuels, and it's firm electricity.