The ban on building new nuclear power plants could be heading for the scrapheap.
Parliament has begun debating a proposal that would remove the restriction introduced after the Fukushima disaster and endorsed by voters in 2017.
Supporters argue nuclear power is essential for energy security and meeting climate targets, while opponents warn of high costs, radioactive waste and a threat to investment in renewables.
With nearly a hundred speakers still to be heard, a decision is expected later today.
Recent polls suggest almost sixty per cent of voters now favour a return to nuclear energy.
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