It'd be really great if wind turbines across Germany were producing at uncorrelated times.

Let's look at the wind right now: uniform wind across Germany:

https://earth.nullschool.net/#2026/09/04/1200Z/wind/surface/...

Let's look at the wind earlier: uniformly no wind across Germany:

https://earth.nullschool.net/#2026/09/02/0000Z/wind/surface/...

Hmmmm.