Dozens of treehouses had been built and occupied by environmental campaigners for years.

Numerous environmental group are not happy with these expansion plans, which have come at a time when a government-approved commission are debating a timeframe for when Germany will phase out coal.

German Enegy Secretary, Thomas Bareiß said: RWE have a “right to do this”.

He added that it was a necessary step to keep Germany’s lights on. He said: “We still need lignite… for our reliable coal supply”.

According to one source, Germany sources nearly 40% of its power from coal.

Now protesters are gone, the company aims to secure the area by digging out a 3.3 ft – 5 ft trench along part of the border to secure the area, which contains numerous ‘keep out’ signs.