Greece's Battery Storage Market Transitions to Profitability Amid Regulatory and Financing Challenges

Greece has reached a milestone in its energy transition with the first grid-scale battery energy storage systems (BESS) becoming operational and generating revenue. According to a report by Aurora Energy Research, the market is shifting from a subsidy-driven pipeline to a merchant-based model where both standalone and co-located projects show strong investment potential. However, the sector faces significant headwinds from grid connection delays and cautious bank lending that could see Greece fall behind regional competitors like Romania and Bulgaria.

Aurora Energy Research reports that Greece’s BESS market has entered a "pipeline to profit" phase, with standalone two-hour batteries expected to derive approximately 70% of their lifetime revenues from energy markets. While balancing markets currently provide vital income, increasing deployment is expected to compress ancillary service margins, necessitating sophisticated revenue optimization across multiple markets. Early investors entering the market within the next two to three years are positioned to capture the highest returns, with internal rates of return (IRRs) projected at 10–12% for standalone merchant batteries and 10–13% for co-located solar-plus-storage (PV+BESS) systems.

The introduction of Articles 11A and 11B has established a new regulatory framework for co-located projects, though it imposes static injection limits that alter project economics. Under the 11A framework, developers achieve the best results by oversizing solar installations, whereas the 11B framework favors larger battery systems to maximize returns. Aurora notes that while these injection limits can reduce IRRs—by as much as three percentage points for 11B projects compared to only 0.5 percentage points for 11A—profitability remains achievable through optimized system design and strategic cycling to capture wholesale and balancing market revenues.

Despite the positive financial outlook, the Greek storage sector faces critical bottlenecks in grid connection allocations and project financing. Banks remain hesitant, often requiring contracted revenues or portfolio-based structures rather than merchant-only exposure. Louiza Moutafi, a Research Associate at Aurora Energy Research, warns that Greece risks losing its competitive edge to neighboring Romania and Bulgaria, which are expanding merchant storage at a faster pace. To maintain momentum and effectively address renewable energy curtailment, Greece must accelerate grid access and streamline the transition from subsidized to merchant-led development.