A referendum on building a new nuclear power plant was held in Bulgaria on 27 January 2013.[1] Whilst it was not explicitly mentioned in the question, it was widely acknowledged that the referendum was about restarting construction at the Belene Nuclear Power Plant.[2][3]
Although the proposal was approved in all 31 electoral divisions, turnout did not pass the required 60% threshold, resulting in the referendum becoming non-binding.[4]
^21.8% Turnout in Bulgaria's Nuclear Referendum, 61% Say 'Yes' - Pollster Novinite.com, 28 January 2013 ("Subsequently, however, Prime Minister Boyko Borisov changed his mind, and urged GERB voters to vote with "no" because the referendum question anyway referred to Belene, and GERB was against the project.")