What follows are German electrical power supply charts that clearly illustrate in no uncertain terms Prof. Vahrenholt’s points. To show just how unreliable wind and sun really are, the first chart shows Germany’s power production, broken down according to the respective sources, over the last 3 and half days:
Agora last 3 days
Power generation Germany vs date/time. Source
Dark blue – conventional power (fossil and nuclear)
Medium blue – wind
Yellow – solar
Green – biomass
Note how there has been a virtual blackout by sun and wind since December 3 as Germany’s weather has been dismally gray and windless over the period. Such conditions are not uncommon in Europe and can persist for 2 weeks or more.