If your target is 2030 that's not enough time to permit and construct a single conventional nuclear power plant in North America. The permitting process alone typically runs 5 years or more before ground is even broken on construction.
I'm sure we can deal with a 30% electricity deficit that happens randomly with a few days notice. We can shut down unimportant things like residential power. No one really needs lightbulbs every day of the month after all.