A lot of towns have been dug away for the lignite. The town now not digged away is just one of the few surviving ones. Also a lot of towns have been drowned for water storage lakes and Hydropower. Europe is populated way too densely to do any large infrastructure project without destroying towns in some ways. The residents are compensated with huge amounts of money, but for some they would still rather stay in the homes they have lived in for 50-80 years.

In this case the original plan was to move westwards because that's where the coal lies in the ground. The lignite in the west is enough to keep the power plants running until 2050, the lignite in the east only until 2030. Because the date is now pushed forwards, it's feasible to dig to the east. Also advanced technology plays a role: the original plans destroying the westwards towns were made when there was no technology to efficiently burn the lignite on the east, which is way less dense.