Switzerland votes in a referendum on Sunday on whether to make a speedy withdrawal from atomic energy production, a move that would reduce nuclear risks but raise reliance on fossil fuels from Germany or imported nuclear power from France.
The opposition Swiss Greens and Social Democrats have pushed for a vote since the 2011 Fukushima disaster in Japan, but the government and industry oppose a quick exit, saying Switzerland would be unable to replace power supplies with renewable energy.
Recent surveys from the gfs.bern polling institute show the "yes" and "no" camps in the referendum are neck and neck.