First, backup generation is expensive. Right now Germany needs about 200GW, and this value will go _up_ when Germany switches from natural gas to heat pumps for heating, and expands the EV fleet.

That's a lot. Even cheap gas turbine power plants will cost around $100B to build.

And while the one-month Dunkelflaute is exceptional, the shorter versions lasting a couple of days happen basically every year. As a result, you probably need about 2-3 weeks a year of various levels of backup utilization every year.

This is how it looks in practice: https://energy-charts.info/charts/power/chart.htm?l=de&c=DE&... - look at the period from 18th Jan to 25th Jan. The renewable generation fell to around 8% of the nameplate capacity during that period.

I have not seen any real plans to fix this. My prediction is that Germany will just continue to burn gas and coal well into 2030-s.