HELLENiQ ENERGY has commissioned a 100 MW/200 MWh BESS in Thessaloniki, Greece
The facility uses LFP batteries and is designed to reduce renewable energy curtailment and improve grid flexibility
The company is developing another 50 MW/200 MWh battery project in Florina
HELLENiQ ENERGY has commissioned a 100 MW/200 MWh battery energy storage system (BESS), calling it one among the largest battery storage projects in Greece and Southeast Europe. It will store renewable energy generated from solar and wind energy technologies.
Built at Thessaloniki, Greece, with an investment of approximately €50 million, it is developed by HELLENiQ Renewables, a subsidiary of HELLENiQ ENERGY as its maiden storage facility. The facility will store surplus renewable electricity and release it when demand increases.
It will provide flexibility and balancing services to Greece’s national electricity transmission system, helping reduce renewable energy curtailment and improve grid reliability. The project is supported under Greece’s National Recovery and Resilience Plan, “Greece 2.0,” funded by the European Union’s NextGenerationEU program.
The facility covers approximately 100,000 square meters and comprises three battery storage systems using lithium iron phosphate (LFP) technology with liquid cooling. HELLENiQ ENERGY said the battery system is expected to complete at least one full charge-discharge cycle daily, with its 200 MWh storage capacity. The 56 battery containers will provide enough energy to fully charge around 3,000 electric vehicles (EV).
It includes a new 33/150 kV step-up substation and an underground high-voltage transmission line extending about 5 km to the Thessaloniki Extra-High Voltage Centre.
The project was selected under the first competitive tender conducted by Greece’s Regulatory Authority for Waste, Energy and Water (RAAEY) for energy storage systems.
The company is also developing a second battery storage project in Florina, Greece, with a planned capacity of 50 MW/200 MWh. Construction is expected to be completed in the near future. Its overall renewable energy and storage project portfolio under development exceeds 6 GW, including more than 1 GW of storage projects under development across Greece, Romania, Cyprus, and Bulgaria.
Greece’s solar association HELAPCO calls energy storage the third pillar of Greek energy market going forward that will support the first two pillars of large commercial projects, and self-consumption.
It estimates that more than 6 GW of battery storage capacity could be available by 2030, although around 8 GW may be needed to manage renewable energy curtailment in the country, exceeding the NECP target of 4.33 GW.
HELAPCO also forecasts the country’s cumulative solar PV capacity to reach 20 GW by 2030 in its most likely scenario, with potential to rise to 27 GW, up from 13 GW interconnected as of May 2026.
