D.TRADING Highlights Battery Storage Opportunities and Investment Risks at Capalo AI Energy Day
Southeast Europe’s battery storage market is offering some of the region’s most attractive investment opportunities. Accelerating deployment, regulatory uncertainty and evolving market dynamics, however, are making commercial structures and counterparty strength increasingly critical to project success.
This was the central message from Stanislav Dudka, Head of Power Desk Europe at D.TRADING, during a fireside chat with Priyanka Shinde, Power Market Expert at Montel, at Capalo AI Energy Day in Helsinki on 22 October 2026.
With October 2026 month-to-date (MTD) TB4 electricity price spreads reaching €225/MWh in Greece and approximately €175/MWh in Romania and Hungary, the region presents significant opportunities for battery storage operators. As new capacity enters the market and price spreads come under pressure, investors must look beyond short-term trading revenues and focus on long-term returns, bankable revenue structures and reliable commercial partnerships.
Strong Price Spreads Create Opportunities, but Regulatory Risks Remain
Southeast Europe is emerging as one of Europe’s most attractive markets for battery energy storage systems (BESS), driven by growing renewable generation, increasing electricity price volatility and significant differences between midday and evening prices.
In October 2026 (MTD), TB4 spreads (the difference between the average prices of the four most expensive and the four cheapest hours of the day) reached approximately €225/MWh in Greece, €177/MWh in Hungary, €175/MWh in Romania and €140/MWh in Bulgaria.
At the same time, midday solar generation across Southeast European markets increased by 65–170% year-on-year, putting downward pressure on daytime electricity prices. Together with nuclear outages and maintenance, and constrained hydropower output in some markets, this has widened the gap between midday and evening prices.
However, Stanislav Dudka emphasised that regulatory uncertainty remains a significant challenge. Changes to cross-border transmission capacity or restrictions on battery operations can materially affect project revenues, even when underlying market fundamentals remain favourable.
Investment Returns Matter More Than Battery Duration
According to Stanislav Dudka, battery investment decisions should focus on returns rather than storage duration alone.
Under current Southeast European market conditions, two-hour battery systems can offer a more attractive investment proposition than four-hour configurations. Ancillary services revenues are often linked to available capacity (MW), while additional storage hours require higher upfront investment without necessarily delivering a proportionate increase in revenue.
As battery technology costs continue to decline, investors should also consider flexible system designs that allow storage capacity to be expanded over time.
Rapid Battery Deployment Is Reshaping Market Dynamics
The accelerating deployment of battery storage is already influencing electricity market dynamics across the region.
In Bulgaria, battery discharge volumes reached 1.82 TWh in 2026 by the time of the event, compared with approximately 0.2 TWh for the whole of 2025. Bulgarian TB4 spreads for October 2026 (MTD) declined by 19% month-on-month, while average baseload electricity prices rose by 56% year-on-year.
These developments show how quickly additional storage capacity can affect the price spreads underpinning battery investment cases, even when wholesale electricity prices are rising.
He noted that investors must account for the potential compression of trading margins as battery penetration increases. Current market opportunities remain substantial, but their economics will continue to evolve as more storage capacity enters the system.
Bankable Revenue Structures Are Essential for Investment
Electricity price volatility creates trading opportunities, but securing financing for battery projects requires predictable revenues and credible counterparties.
Stanislav Dudka highlighted the growing importance of structured offtake agreements, including floor-price and tolling arrangements, which can provide greater revenue certainty while preserving opportunities to benefit from market optimisation.
This approach is central to the cooperation between D.TRADING and Capalo AI across Southeast European markets. Battery developers work with one contract and one counterparty: D.TRADING brings energy trading expertise, structured offtake solutions and credit backed by bank guarantees, while Capalo AI provides AI-driven battery optimisation on top.
Together, the companies aim to provide battery developers and investors with integrated solutions that support project bankability while capturing the commercial value of their assets.
Strong Counterparties Are Key to Long-Term Success
Concluding the discussion, Stanislav Dudka said the long-term success of battery storage projects will depend less on technology or today’s electricity price spreads and more on the strength of their commercial arrangements.
As battery deployment accelerates and trading margins come under pressure, developers and investors need partners capable of managing market risks, securing predictable revenues and delivering value throughout the project’s lifetime.
For battery developers, the commercial priority is clear: secure a bankable revenue structure today while retaining the flexibility to capture market opportunities tomorrow. In an increasingly competitive market, the projects that convert price volatility into sustainable, financeable revenues will hold the advantage.
