Bulgaria’s storage fleet is estimated at more than 6.2 GW of power capacity and 19 GWh of energy capacity, enough to reshape regional day-ahead prices. By shifting electricity between low- and high-price hours, batteries support exports during scarcity periods while compressing the spreads available to storage projects.
Battery operators across Southeast Europe are increasingly buying solar-heavy midday electricity to sell later, with Bulgaria leading the trend. Serbia has begun recording negative day-ahead prices, creating a potential but variable source of low-cost power for storage.
Eurostat data show household electricity prices remained comparatively low across much of the Western Balkans, while Romania recorded the EU’s sharpest increase in the first half of 2026. Retail tariffs do not capture differences in procurement, balancing and fiscal costs.
Scheduled electricity exchanges between the Western Balkans Six and neighbouring EU markets fell 17.8% in January–September 2026, while regional day-ahead trading volumes rose 26.7% year on year in the third quarter. The Energy Community Secretariat’s assessment links the diverging trends to a market in which CBAM costs and conditions increasingly shape cross-border trade.
EU electricity importers must declare embedded emissions and surrender CBAM certificates for power imported in 2026 by 30 September 2027. Certificate purchases begin in February 2027, making emissions evidence and the allocation of costs relevant to electricity contracts.
The Energy Community Secretariat called for closer coordination between Western Balkan electricity market integration and the EU’s carbon border rules. It warned that poorly aligned arrangements could discourage renewable investment and divide EU and non-EU electricity markets.
EU carbon-border rules could affect the prices and revenues available to renewable projects in Serbia, Montenegro and the wider Western Balkans. Lenders may need to distinguish between domestic sales, exports under default emissions treatment and exports meeting actual-emissions evidence requirements.
CBAM requirements could affect the revenue and financing of renewable projects in Serbia, Montenegro and the wider Western Balkans. The Energy Community Secretariat’s Q2 2026 assessment highlights verification, power purchase agreement eligibility and access to EU market prices as challenges.
Southeast Europe faces a growing power-system flexibility shortage as grids, storage and dispatchable capacity lag behind project growth and rising volatility. Country-level pressures range from heavy imports in Serbia to negative prices in Croatia and faster battery deployment in Bulgaria.
Kosovo enters its highest-demand months with the 260 MW B1 unit still unavailable, increasing reliance on electricity imports. The operator has not set a return date as regional prices and interconnector availability remain key variables.
Austria's Verbund has signed a power-purchase agreement for the first project selected in Albania's first wind auction to reach construction readiness. Commercial operation is targeted for the first quarter of 2028.
Bulgaria’s operating battery fleet was reported at 6.23 GW by late October, while EBRD and Raiffeisen are financing a new 246 MW battery at Tenevo. The reported fleet and energy-flow figures require verification against underlying data.
Buyers took 34,000 of 35,000 wind guarantees of origin offered in North Macedonia’s first auction. The sale adds a price-discovery mechanism to the country’s existing administrative framework.