The numbers are too low. We have seen a surge in solar panels on balconies (~10% in this higher income neighborhood), which isn't taken into account. Also several people in my family have their roof full for their own consumtion + EV, this also not taken into account.

We recently went on the Autobahn for a 1000km journey, and you can see some solar farms, but very few. There is still a huge potential.

Solar will also kick into second gear as soon as batteries get cheaper or EV batteries are recycled into house batteries.