Bulgarian electricity generation increased significantly in the first seven and a half months of 2026, supported by stronger renewable output even as production from conventional baseload plants declined.
Electricity production between 1 January and 16 August reached 27.86 TWh, up 8.34% year on year, according to Bulgarian transmission system operator ESO.
Domestic electricity consumption also increased, rising 6.91% to 25.78 TWh over the same period. Generation nevertheless remained above consumption, leaving Bulgaria with net electricity exports of approximately 2.07 TWh.
That surplus continues to support Bulgaria’s role as one of the more important exporting systems in southeast Europe, particularly during periods when neighbouring markets require additional baseload or daytime supply.
The composition of generation is changing, however. Coal and nuclear plants together produced 17.32 TWh, a decline of 6% from the corresponding 2025 period.
Renewable generation moved in the opposite direction. Renewable electricity connected to the transmission network increased 18.25% to 3,109.2 GWh, while renewable generation within distribution networks rose 7.17% to 2,853.8 GWh.
The figures point to a Bulgarian market where higher total output is increasingly being supported by renewable capacity rather than additional conventional baseload generation. This changes not only the annual generation mix but also the shape of the power system during individual hours.
Higher solar output, in particular, can strengthen daytime export capability while simultaneously increasing the requirement for dispatchable capacity, storage and cross-border trading during the evening ramp. Bulgaria’s substantial nuclear fleet remains an important stabilising element within that transition because it provides a large block of relatively predictable baseload generation beneath increasingly variable renewable production.
The 2.07 TWh net export position accumulated through mid-August demonstrates that rising domestic consumption has so far not eliminated Bulgaria’s regional supply surplus. The durability of that position will increasingly depend on renewable availability, nuclear generation, hydrology and the operating profile of the country’s coal fleet as the generation mix continues to shift.
