These days if you have a natural gas plant that's running most of the time, you can save money by building a solar install of the same capacity and just not burn the fuel for the time when the sun is up. Meaning, that the average new solar power installation now cheaper than the operations and maintenance cost of the average gas generator.
I don't think that the bad behavior of one German green group is representative of all renewables proponents. Nearly everybody in the renewables space is trying to stop gas burning as quickly as possible.