Surface limitations facing the expansion of photovoltaics in Germany have led to a bold vision: installing PV arrays along motorways and creating a vast DC smart grid in the process. 

In addition to floating PV arrays and agrivoltaic systems, motorways could be an ideal solution for the surface problem of photovoltaics. By 2030, up to 200 TWh of solar power could be annually generated along Germany’s autobahn network. 

https://www.pv-magazine.com/2023/04/11/german-highway-pv-could-generate-up-to-200-twh-a-year/

 

200 TWH would constitute about 40% of German power consumption in 2021.

 

"Germany’s Federal Network Agency (Bundesnetzagentur) has published the country’s electricity market data for 2022. German electricity consumption (grid load) fell by 4% in 2022 to reach 484.2 TWh in 2022 (504.5 TWh in 2021), while net electricity generation increased by 0.4% to 506.8 TWh (505.0 TWh in 2021). The share of electricity generated from renewable energies increased in 2022 to reach 48.3% (42.7% in 2021). Wind (onshore and offshore) accounted for a share of 25.9%. Solar PV accounted for 11.4% and biomass for 8.2%."

https://www.enerdata.net/publications/daily-energy-news/germanys-power-consumption-falls-2022-generation-renewables-rises.html#:~:text=Germany's Federal Network Agency (Bundesnetzagentur,(505.0 TWh in 2021).

 

For what it's worth, biomass is BS. Forests that store carbon get chopped down and burned to provide electricity. It's a scam. Still wind and solar combined to produce 40% of electricity that was consumed.