@peterdutoit "now" - this law was enabled in 2022 and many of these solar spaces are already built. In my region, a hypermarket parking space supplies the surrounding supermarkets and a huge residential neighbourhood with electricity.
The only problem is that it takes a little longer because the demand for solar systems is immense. And these are special constructions. An example from 2022: https://www.lalsace.fr/economie/2022/04/26/cora-wittenheim-solarise-son-parking or here: https://www.pv-magazine.fr/2023/06/30/volkswagen-france-inaugure-une-ombriere-de-parking-de-20-mwc/