Production of electricity in Bulgaria fell by 9.2% on a monthly basis to 4,260 gigawatthours (GWh) in February, the National Statistics Institute (NSI) said.
Year-on-year, power output in the country increased by 10.5% in February, the NSI said in a statement.
Production of solid fuels grew by 13% on the year, while unleaded gasoline output fell by 9.8% in February.
Natural gas output too declined in February, by 18.2% compared to the same month of 2013.