Data centres in Southeast Europe could become anchor customers for battery-backed power, linking continuous, reliability-sensitive electricity demand with renewable generation and grid-scale storage. Long-term contracts with these offtakers could shift part of battery revenues from merchant-market exposure to contracted cash flow. Such revenue could support project financing.
Storage can serve data-centre facilities beyond the brief interruptions covered by dedicated uninterruptible power systems. Grid-scale or campus batteries can reduce exposure to market price peaks, support shaped renewable power purchase agreements and provide controllable demand during balancing events. On several tight days in October 2026, day-ahead prices exceeded EUR 250/MWh in Hungary and Serbia, while regional price spreads widened sharply. A data centre with a high load factor could contract storage around its consumption to turn some volatility into predictable savings rather than rely only on merchant trading.
Regional renewable and storage capacity
Bulgaria’s renewable and storage supply base includes around 7.2 GW of solar capacity and more than 6.2 GW of battery power, according to the latest estimates. In Romania, combined utility-scale and prosumer photovoltaic capacity exceeded roughly 7.6 GW in mid-2026 estimates. Storage capacity there was above 1 GW by autumn 2026.
Contracts could support project financing
A creditworthy data-centre offtaker could improve a storage developer’s ability to finance a project. Long-term flexibility or shaped-power contracts could raise debt capacity and reduce the cost of capital by securing part of a battery’s revenue. These arrangements would connect renewable generation, battery storage and industrial offtake. Their value would depend on contracting storage around data-centre loads rather than relying solely on merchant-market revenues.
