HELLENiQ Renewables, a member of HELLENiQ ENERGY, has completed construction of the group’s first battery energy storage system (BESS) at its industrial facilities in Thessaloniki.

With installed capacity of 100 MW and storage capacity of 200 MWh, the project is one of the largest electricity storage facilities to have been developed in Greece and southeastern Europe.

The investment, with a total value of approximately 50 million euros, marks an important milestone for HELLENiQ ENERGY as it expands its portfolio beyond renewable power generation into critical infrastructure designed to enable more efficient use of renewable energy.

The project will also provide flexibility and balancing services to Greece’s national electricity transmission system, strengthening its reliability and resilience while contributing to the country’s energy security.

HELLENiQ ENERGY has been expanding its renewable energy portfolio in recent years as part of a broader strategy to diversify and modernize its energy business. The group has also been pursuing investments in energy storage alongside renewable generation, while seeking to strengthen its position in the wider Southeast European energy market.

Better use of green energy

A significant share of renewable electricity generation is lost when instantaneous demand is lower than output. Projects such as the HELLENiQ Renewables facility allow more renewable energy to be utilized by storing it in batteries for use when demand is higher.

This improves the efficiency of the electricity system, reduces renewable-energy curtailment and creates the necessary grid capacity to accommodate additional renewable energy units in the national system.

The development also comes as HELLENiQ ENERGY positions renewable generation and storage as complementary components of its broader energy strategy, with the company identifying storage as an important element in improving flexibility and supporting Greece’s transition toward a more diversified and resilient energy system.