I am asking you to prove your claim that renewables are not a stand-alone option.
I did not claim that, I suspect that you misunderstood something.
I'll clarify what I meant for your benefit. Germany has constructed a lot of new renewable power in the past two decades, which is great, but they prioritized shutting down nuclear power plants instead of fossil fuelled power. Because of this, they still get ~50% of their electricity from fossil fuels, which is not so great.
If they instead had prioritized phasing out fossil fuelled power plants, that number would've been more like 20-30%, and more crucially, they could've phased out their entire fleet of coal power plants. Ergo, criticism of German energy policy is entirely justified.
...and your comment replied to one criticising German energy policy, hence the context of "the criticism being justified". The bad policy decisions have already been made (from 2005-current) and it does seem like Germany will be stuck with coal power for quite some time because of their poor policymaking.
The question was not about the price of building new nuclear power, but of maintaining old plants, and existing nuclear) power provides incredibly cheap, green energy. Simply put, my "claim" as you want to put it, Germany could have rid themselves of coal power with the help of the VRE they invested ln, but instead shut down their old nucler plants. The "proof" is no more difficult than studying their energy profile for the past 20 yrs.
In hindsight, the OC was somewhat rude towards you in particular, which I don't agree with, but alas.
Anyway, you seem to want to discuss future electricity solutions rather than the existing one, and I'd happily have a separate discussion on what mix of green energy sources ought to be used, if you'd like.
IMO based on what I have read over the years, optimal green energy mixes land on 40-70% VRE depending on regional climate factors, with the rest filled out by dispatchable sources such as hydropower, geothermal, biomass and nuclear power plants.