Electricity isn't the issue, several countries have re-opened coal plants to deal with that (also from what I understand the nuclear plants can't just be turned back on, they are several stages through decommissioning and were already reaching the end of service without refurbishment, etc.).

But natural gas itself is still required for industry and domestic heating in most of Europe, and that cannot be solved in the 3 months remaining to winter.

Well, to continue operating the three nuclear plants that are currently still operating (not to mention restarting those that have been shut down years ago), they would have to order new fuel rods. Obviously those aren't things you can simply order on Amazon. Usually, these orders have to be planned years in advance, and the chances of reducing the waiting time are pretty slim, because guess who is the largest manufacturer? Right, https://en.wikipedia.org/wiki/Rosatom.

I still do not understand why there's a lot of focus on Germany without mentioning Italy.

They have voted in the 80s to ban nuclear power as well, and now energy costs are through the roof. It will be an awful, expensive winter over there importing French nuclear electricity and Russian gas.

AFAIK there is no movement whatsoever to reconsider that referendum. Last I checked Italians are very much against it.

The plants would need refueling and a big safety check and overhaul, which would take them offline at pretty much exactly the time where they would be the most useful. The only way to make them useful for this situation would be to skip the safety check. And everything the last few years has been done under the assumption that they will shut down, this is not an easy decision to reverse on the spot.

And for energy generation we can fall back to coal, which is easier and quicker to reactivate than nuclear energy. Not nice in terms of CO2, but the most practical solution right now.

By the look of it, it seems they prefer coal and power cuts to nuclear energy. As long as they own their choices.

It’s really not that simple. The reasons for shutting down are multiple, not the least of which is staffing.

When we originally legislated the closing of the nuclear plants, the next (conservative) government reverted those plans, only to change their minds after Fukushima. If we now revert again, the comedians would have a field day with Germany doing an exit from exit from the exit from the exit from nuclear energy