As I pointed out above, the balancing is less urgent. While you're doing your war-mode build-out of renewables capacity, you need a war-mode expansion of transmission infrastructure, but the balancing is provided by the fossil plants you're displacing. You don't need any new peaking gas plants, surely?

So, when you hit your target in terms of renewables capacity, and your fossil plants are only producing say 25% of the electricity they are producing today, you switch the war-mode effort to pumped storage etc... having done the planning carefully in the meantime of course.

_{It is rightly acknowledged that people of faith have no monopoly of virtue - Queen Elizabeth II}