Looks like shutting down the nuclear reactors is working out splendidly.
If nuclear wasn't so incredibly overregulated and if we hadn't had decades-long antinuclear smear campaigns, costs would come down and we would see it as an energy option that has incredible benefits with well-known tradeoffs. Its difficult engineering, but they're well-known problems.
It's either build new ones or turn them off. Switzerland has the ability to store vast amounts of energy via hydroplants. Alternative energy like solar is therefore quite useful even at night.