Grafenrheinfeld will be shut amid Germany's plan to phase out all nuclear power and replace it with renewables.
After Grafenrheinfeld, another eight nuclear power plants will be switched off by 2022.
Despite the nuclear exit, there have so far been no energy bottlenecks in Europe's biggest economy. On the contrary, Germany's government last year for the first time introduced a cap on new wind installations (a cap for solar was already in place), and lowered its offshore wind ambitions to avoid an oversupply in electricity and too high costs for the RE build-up.