The EU has about 300 coal power plants.
With 100 people at each, that's only 30,000 people.
In 2019, 300,000 people joined the 'climate strike' in the UK alone:
https://en.wikipedia.org/wiki/September_2019_climate_strikes....
At this coal plant in Germany, just five people were able to shut it down for several hours, saving 26,000 tonnes of CO2:
https://www.theguardian.com/environment/2019/dec/04/no-regre...
We could probably pull this off just with the backing and resources of a multi-millionaire, to pay someone to organise the activists, identify the locations and equipment, and to bail them out of jail and defend them in courts.