The Greek electricity distribution system is poised for significant advancements in energy storage capacity, with a recent evaluation indicating that it can accommodate between 1.8 and 2.9 GW of battery energy storage. Conducted by the national distribution operator DEDDIE, this assessment highlights the infrastructure’s ability to support standalone storage solutions while maintaining network stability.
This analysis specifically examined the mainland distribution network, focusing on 230 substations and 453 power transformers. It identified regions with high solar energy production as optimal sites for battery integration. The predictable nature of solar generation allows for effective charging and discharging of batteries, which can mitigate network congestion, a challenge not as easily managed by more variable renewable sources like wind or hydropower.
DEDDIE pinpointed 70 substations as key locations for potential merchant battery projects. These substations were selected based on their ability to harness high solar output, thereby enhancing electricity flow and alleviating local overloads. The study also underscored regional disparities: areas such as Attica and Epirus exhibit limited capacity due to fewer suitable substations and lower solar density, whereas central Greece and central Macedonia present opportunities for nearly double the capacity due to robust photovoltaic installations and available network infrastructure.
The report cautioned that the benefits of larger battery systems do not scale linearly; beyond a certain point, additional storage yields diminishing returns in terms of congestion relief. The optimal range for battery capacity was identified as between 1.15 and 1.7 GW, where efficiency gains are maximized.
This assessment emphasizes the increasing importance of energy storage within Greece’s electricity framework, particularly as solar power becomes the predominant source of new renewable capacity. By 2025, projections indicate that the distribution network will incorporate approximately 9 GW of renewable resources, comprising about 7.2 GW of solar energy. Meanwhile, the transmission network is expected to reach a total of 8.1 GW, with 3.7 GW derived from solar generation. These developments signify a shift in perspective towards viewing battery storage as critical infrastructure rather than merely an ancillary technology.
