[ars]

It only works in places without much snow.

If you need the solar-roof to also support snow load it's way way way too expensive to build.

For places with snow load you either put them on an already strong roof, or on the ground.

[mcv]

Put them at an angle so the snow slides off. And France doesn't get the meters of snow that you get in Canada.

[Beldin]

Indeed - according to the article, the law requires a lot of parking lot surface area to be covered. Not necessarily by one gigantic roof, just as long as solar panels are blocking direct sunlight.

[ars]

If there's snow plus freezing rain it won't slide off even at an angle.

If France doesn't get much snow, then sure, sounds like a good place for this.