Output and demand trends to 16 August
Bulgarian electricity generation rose in the first seven and a half months of 2026, with total output increasing while conventional baseload production 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. Over the same period, domestic electricity consumption increased by 6.91% to 25.78 TWh.
Despite higher demand, generation remained above consumption, leaving Bulgaria with net electricity exports of approximately 2.07 TWh. The surplus supports Bulgaria’s position as an exporting system in southeast Europe, including during periods when neighbouring markets require additional baseload or daytime supply.
Changing generation mix: coal, nuclear and renewables
The generation mix is shifting as coal and nuclear output declines. Coal and nuclear plants together produced 17.32 TWh, down 6% compared with the corresponding period in 2025. Renewable generation moved in the opposite direction during the same timeframe.
Renewable electricity connected to the transmission network increased by 18.25% to 3,109.2 GWh. Renewable generation within distribution networks rose by 7.17% to 2,853.8 GWh.
System implications for hourly operations and exports
The data indicate that higher total output is increasingly supported by renewable capacity rather than additional conventional baseload generation. This affects not only the annual generation mix but also how the power system operates across individual hours. The role of solar output is highlighted through its impact on daytime export capability.
An increase in solar output can also raise requirements for dispatchable capacity, storage and cross-border trading during the evening ramp. Bulgaria’s nuclear fleet remains a stabilising element within that transition because it provides a large block of relatively predictable baseload generation beneath more variable renewable production.
Export surplus through mid-August and factors affecting it
The net export position of approximately 2.07 TWh, accumulated through mid-August, shows that rising domestic consumption has not removed Bulgaria’s regional supply surplus so far. The persistence of that position depends on renewable availability, nuclear generation, hydrology and the operating profile of the country’s coal fleet as the generation mix continues to change.
