Electricity output in September was lower than in August, when it totalled 1,096 GWh, the country's statistical office said.
Electricity imports rose to 411 GWh in September from 315 GWh in the same month of 2021, whereas exports fell to 423 GWh from 490 GWh.
Compared to the previous month, electricity imports in September rose 4.1%, while exports fell 26%.
Electricity made available to the domestic market amounted to 891 GWh in September, down from 918 GWh in August, and lower than 927 GWh in September 2021.