A narrow majority could emerge in the National Council to lift the ban on building new nuclear power plants.
A poll for the newspaper, the SonntagsZeitung poll suggests key support from members of the Centre party, potentially tipping the balance to 101 votes against 99.
The ban was approved by voters in 2017 - but rising energy demands, driven by technologies like artificial intelligence, are reigniting debate.
Centre Vice-President, Vincent Maitre, says the country must “evolve with the times” as it reassesses its energy mix.
But it will likely end up with another people’s vote as the Green party says if it passes, it would force a referendum.
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