[rapsey]

Covering parking lots requires a scaffolding structure to hold the panels. The cost of this structure is probably higher than the panels.

A much better plan would be mandating all large building roofs to be covered by panels unless unsuitable. You could literally double the amount of panels for the same $$.

All the warehouses, shopping malls, government buildings and factories is a very large amount of space.

[nebalee]

New commercial buildings are already required to have solar panels (or plants) installed on the roof: https://www.theguardian.com/world/2015/mar/20/france-decrees... https://www.architectmagazine.com/technology/france-mandates...