So french nuclear power and an effort for the french to go greener allows for some extra energy from France. + 2GWe
Italy is encouraged to go as green as possible aiding Germany.+3GWe
Poland is urged to use a bit more coal for Germany.+1GWe used during spikes
Germany upgrades it's land and sea green electric generation. +7GWe
Germany fires up a few more coal power plants.+1.2GWe used during spikes
Germany invests more in energy efficiency efforts which can be Implemented by this and next winter. this one coming being the hardest. +0.7 GWe
Britain makes a gesture of some subsidised fuel stocks and partnering with Germany a bit more to go green grid quicker especially where heating solutions are concerned.
Germany's super fast track for this winter 120 50MWe aluminium Air power plants that can go up with spikes and start getting prepared to have nearly all the aluminium byproduct reprocessed via excess electric in grid over the next year. With very strong backing from America and the UK and other countries in the project. 6GWe good with spikes. 24m Kg a day over 80 days is 1.92 billion KG of aluminium. however if Germany only use these plants to deal with over spill better relative to the measures already in place and the measures suggested here then minimal rationing will be needed and far less than over 1 billion KG of aluminium will need to be used and I think I've over estimated to be on the safe side the amount of aluminium required and the aluminum use could come from digging out unrecycled aluminium and recycling it.
To lower the development in electric cars until electricity until the winter is less of an issue with everyone chipping in to and doubling down to develop a good battery science for the near and slightly further future and get going with it quicker.
Do the maths you'll see there's a path i think in what i'm suggesting.