[myrmidon]

To put this somewhat in perspective ("why is Germany not installing 700km² of PV panels right now?"):

Grid operators project costs of around €250 billion [1] (within 2045) for grid expansion alone, and NIMBYism is a big problem everywhere in Germany.

Battery storage to allow going full PV (1 week) would be at least twice that [2].

There is also plenty of "anti-green" sentiment in Germany generally and the current government coalition is in a somewhat precarious position, discouraging long-term investments like that.

[1] Source for grid costs (this is what grid operators are planning, so take it with a grain of salt): https://www.netzentwicklungsplan.de/sites/default/files/2023...

[2] Battery cost is just assuming full power for 1 week at 50 €/kWh (IMO quite optimistically).