Bulgaria’s electricity production rose 9.65% year on year to 30.64 TWh between Jan. 1 and Sept. 6, helped by sharply stronger hydropower and renewable generation, widening the country’s electricity surplus.
Domestic consumption increased 7.77% to 28.04 TWh, while the power trade balance showed a surplus of 2.60 TWh, compared with 1.93 TWh in the same period last year, data from Bulgaria’s Electricity System Operator showed.
The increase in available generation was particularly strong in hydropower.
Hydroelectric output jumped to 3.60 TWh from 2.01 TWh, a rise of almost 80%.
Renewable electricity connected to the transmission network increased 23% to 3.57 TWh, while renewable generation in distribution networks rose 8.4% to 3.19 TWh.
The wider power surplus strengthens Bulgaria’s potential role as an exporter into neighbouring markets during periods when domestic generation exceeds demand.
That is relevant for Southeast European price formation because Bulgaria sits between Romania, Serbia, North Macedonia, Greece and Turkey and can influence flows across several important regional corridors.
The hydro recovery is particularly important.
Hydropower can respond more rapidly to changing system conditions than baseload generation and therefore provides both electricity and flexibility during peak-price periods. Stronger hydro availability can also reduce dependence on thermal generation when solar and wind production weaken.
The Bulgarian data come after drought and low Danube levels created concerns over hydro and nuclear availability across parts of Southeast Europe during the summer.
The improvement does not remove those structural risks, and generation conditions can change rapidly with hydrology and nuclear availability.
But the 2.60 TWh year-to-date surplus gives Bulgaria a materially stronger position than a year earlier.
For regional traders, the key question is increasingly not simply whether Bulgaria has excess generation, but during which hours that surplus reaches neighbouring markets.
As solar penetration rises across Bulgaria and Greece, daytime export availability may increase while evening scarcity remains comparatively more valuable — reinforcing the importance of storage, hydro flexibility and cross-border capacity allocation.
