The original contract with the company RWE was made in the 1990s and included destroying whole towns for the coal mine, which was planned to be in use until 2038.
What we see now is a compromise between RWE, the state of North Rhine-Westphalia and the federal government to save the remaining towns and close the mine earlier (in 2030). The wind turbines are from 2001 and are nearing the end of their lifecycle.