So if nuclear is the answer, Germany will need to see what it takes to reverse a long term shut down or build new.
I think that Sweden burns garbage to warm houses. Maybe exploring it could be useful.
The European power grid is very much already a thing and France exported 9.5 TWh of power to Germany last year (and imported 3.7TWh): https://energy-charts.info/charts/import_export/chart.htm?l=....
I think the cards a pretty much on the table at this point. What's left is various industry groups trying to get a bigger share of the to be invested money. Some think that the war won't last long enough for the next winter and as Russia 'has always delivered', it won't be an issue anyways. Also, there are still coal back-up plants. It wouldn't be nice but people will not die because of this.