Swiss voters rejected a plan to accelerate the country’s exit from nuclear energy in a referendum Sunday, turning down an initiative that would have forced their government to shut the last plant in 2029.

The plan promoted by the Green party would have meant closing three of Switzerland’s five nuclear plants next year.

Polls ahead of the referendum had shown a tight race, but voters shot down the initiative by 54.2 percent to 45.8 percent.

Under Switzerland’s direct democracy system, proposals need support from both a majority of the country’s cantons (states) and of the national vote to pass. Only six of Switzerland’s 26 states backed the nuclear shutdown plan.