Belgium shut down its oldest nuclear reactor, Tihange 1, on Tuesday evening after 50 years of service, leaving only three reactors running as political debate continues over the country’s nuclear future.

The reactor has been taken offline and will undergo cleaning over the next three years before dismantling begins in 2028. At the Tihange site near Liège, only Tihange 3 remains in service, and it is expected to run for another ten years.

That leaves only three reactors operating in Belgium: Tihange 1 and the Doel 2 and Doel 4 units near Antwerp. Doel 2 is scheduled to close at the end of November.

The future of nuclear energy in Belgium remains uncertain. While the country decided 22 years ago to phase it out entirely, the current five-party coalition led by PM Bart De Wever reversed course in May this year and announced plans to build new reactors. So far, however, the political back-and-forth in Brussels has left the details unresolved.