Switzerland approved a law aimed at accelerating the development of renewable energies, as part of the country's bid to attain carbon neutrality by 2050.
Official results showed that just under 69 percent of Swiss voters backed the law on "a secure electricity supply based on renewable energies", confirming polling trends published before the nationwide referendum.
"The Swiss people have taken an important decision about our electricity supply," said the Alliance For a Safe and Affordable Electricity Supply, which backed the law.
Less than two months ago, Switzerland became the first nation ever to be condemned by an international court for not doing enough to combat climate change, in a ruling by the European Court of Human Rights.
The renewables law was approved by parliament last year, and most environmental organisations back the legislation and its ambitions.
They include heavyweights Greenpeace and WWF.
Reacting to the referendum result, Greenpeace said it meant nuclear was now "obsolete" and urged Swiss energy group Axpo to "set a deadline for the swift and definitive halt of the two reactors and the Beznau nuclear plant".
"They are among the oldest reactors still active on the planet and pose an insoluble security risk," it said.
Environment and Energy Minister Albert Rosti said the law was "an important milestone for strengthening security of supply" in Switzerland, particularly in winter.
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