The Bulgarian Socialist Party and nationalist party Ataka filed on Friday a no-confidence motion against the centre-right government over its decision to abandon a project for the construction of a nuclear power plant.
The decision to drop the Belene nuclear power plant project is fatal for Bulgaria's energy sector and will place the country in a situation where it will have to import power from Turkey, the state-run Bulgarian National Radio (BNR) quoted the Socialists' leader Sergei Stanishev as saying.
The no-confidence motion was signed by 48 MPs.
It needs 121 votes to pass.
This will be the fourth no-confidence vote against the cabinet of Prime Minister Boiko Borisov which took office in July 2009.
Opinion polls show Borisov's cabinet continues to enjoy wide public support.