FWIW I think it is a very good decision to get rid of all NPPs.
Why? Explain your reasoning.
There are a couple of good reasons:
It is a misconception that nuclear power is unconditionally cheap. Nuclear power is cheap because we use it in an irresponsible way. That is we reap the benefits py producing energy but do not deal with the environmental debt in form of nuclear waste but just keep piling it up in "intermediate storages" until we have a better idea. The ultimate plan seems to be that some
unlucky commune is gonna draw the short straw and becomes the final nuclear waste disposal site. To this day the "final disposal problem has not been solved". One of the most vocal advocates of nuclear power in Germany is Bavaria, howevery strangely when it comes to the question where to put the waste they absolutely refuse to store the waste.
So the reasoning here is simple: If I want to use nuclear power I need to be willing to deal with the waste. So unless I'm a) willing to store nucelar waste in "my basement" (figuratively speaking) and b) to pay
in advance all future maintenance cost for that storage until the waste becomes innocuous (i.e. the next 24000 to 1000000 years), I can not use nuclear power responsibly. Conclusion if I'm not (willing/able) to use nuclear power responsibly I shouldn't use it at all.
Another good argument is: "Uranium doesn't grow on trees" or more precisely If we use nuclear power we rely on imports. Apparently a lot of uranium comes from Russia which, for obvious reasons is not a partner you want to rely on for your energy supply. Of course there are other sources but ultimately the Russia crisis has demonstrated that crucial infrastructure should not be indirectly controlled by external actors. Simply put a country is not independent as long as it is not able to ensure its energy supply.
Bonus: A distributed power grid based on renewables is much more resilient against military attacks and natural disasters.
Gas should be substituted by hydrogen and the coal plants should be shut down ASAP as well of course and only serve as backups.
Where do you believe this magical hydrogen going to come from?
Germany is working on a
giant off-shore wind-park. As others have mentioned there is still the transport problem because not every region in Germany is close to a coast. So using excess energy to produce hydrogen which then can be transported is a good solution.
So what about the cost? Yes energy in Germany is currently insanely expensive (for private households). However this is not a problem of renewable energy sources or the shutdown of nuclear power plants. But a political problem introduced
by the industrial lobby. Private households are forced to massively subsidize energy production for large companies. As you can see the
average household paid 33,50 ct/kWh while the average business only pays 19,89ct/kWh and you can bet that
the largest consumers like Thyssen Krupp, BASF, Bayer, Rheinmetall etc. pay *a lot* less than that. So the price won't be a problem once we even out the energy price and have large companies pay their bills themselves.
So it is April 15 today. Is Germany dancing and partying ? 
Germans don't do such things, we build stuff
