Hydro has a natural limit. After you have put a dam to every river that’s it. And the Swiss aint far from that.

There are also cloudy days without much wind, and those are quite harsh during winter.

What should one do then? Just shut everything down?

Whether or not that's the case, the problem is that if you put together all the nuclear, solar, wind and hydro we can manage, we will still have less energy than what we get easily with oil.

I don't get why they even compete against each other: we need as much as we can of everything that we can.