Fortis Energy’s ready-to-build Nocaj project combines 270 MWp of solar capacity with 72 MWh of battery storage, with commercial operation targeted for the second quarter of 2028. The project shows how storage could support shaped renewable power purchase agreements for Serbian industrial buyers.
Rapid storage deployment across Southeast Europe is expected to narrow arbitrage spreads and lower prices for some balancing services. Long-term projects will need to account for competition and diversify their revenue sources.
Southeast Europe’s battery capacity has reached gigawatt scale in several markets, shifting the investment test towards whether projects can service debt through lower spreads and ancillary-service prices. Bulgaria’s latest 2026 estimates put storage above 6.2 GW, while Romania and Hungary have also recorded more than 1 GW of operating or grid-scale capacity.
Serbia’s day-ahead market showed an almost EUR 179/MWh gap between its daily low and the hour-20 peak on 15 October. But the spread alone does not show how much a battery can earn or support a bankable revenue forecast.
Battery deployment is adding within-market hourly arbitrage to Southeast Europe’s traditional cross-border power trading. Bulgaria’s battery fleet exceeds 6.2 GW of power, enabling it to shift domestic solar generation into later hours.
SEEPEX introduced negative electricity prices for delivery in Serbia from 6 May 2026. The market recorded both negative prices and October prices above EUR 300/MWh, sharpening the investment case for storage.
Battery lenders in Southeast Europe need probabilistic revenue analysis rather than a single P50 forecast. Rapid storage growth and changing electricity prices can alter project cash flow and debt-service capacity.
As battery capacity expands and energy spreads compress in Southeast Europe, balancing revenues may help projects support debt but face their own saturation risk. Lenders need to assess that exposure separately from arbitrage income.
The 127 MW / 254 MWh standalone battery secured non-recourse financing through an EBRD package of up to 44 million euros, supported by InvestEU. The project shows how storage can attract project finance with merchant revenue when risks are carefully allocated.
Montenegro’s 2025 battery tender shows why EPC bids need to be assessed on lifetime energy delivery, grid compliance and warranty performance. A lower initial price can carry greater performance and financing risk if usable capacity falls short.
Dispatch authority determines storage revenue, battery degradation and compliance with market obligations. Projects in Bulgaria, Romania and Hungary show why lenders and operators need clear control rights in financing and operating arrangements.
Southeast Europe is developing merchant and state-backed battery projects, with financing models shaped by market depth and the value storage provides to the power system. Romania’s Scornicesti project illustrates the merchant approach, while North Macedonia and Montenegro are pursuing state-backed or strategic-partner structures.
