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For decades, the U.S. government has been staring down a growing problem: It doesn’t have a permanent site to dispose of used nuclear fuel.

Finland, however, is about to be the first country that does.

Posiva Oy, a joint venture owned by two Finnish nuclear power companies, is on the cusp of officially starting operations at what is set to be the world’s first permanent underground disposal site for spent nuclear fuel. The Times reported on their plans in 2017.

Posiva has been working on the site, located on the country’s western coast, since 2004, and it hopes to begin permanent disposal in less than a year.

“We have a solution,” said Pasi Tuohimaa, Posiva’s communications manager. “Final disposal of the spent fuel, it has been the missing part of sustainable use of nuclear energy.”