HELLENiQ ENERGY has brought a 100 MW/200 MWh battery storage facility into operation at its Thessaloniki industrial complex. The project, developed by HELLENiQ Renewables, represents an investment of approximately €50 million. It is designed to complete at least one full charge-discharge cycle daily, storing and releasing more than 200 MWh of electricity.
Facility design and grid connection
The installation comprises three lithium-iron-phosphate battery systems. It is supported by a new 33/150 kV substation and approximately five kilometres of underground high-voltage connection. Unlike many announced Greek storage projects, the Thessaloniki facility has completed construction and entered operation.
Market conditions for charging and discharge
During October, Greece experienced repeated periods of negative wholesale electricity prices as solar and wind production exceeded daytime demand. At the same time, evening prices have frequently climbed above €200–300/MWh. The price spread creates opportunities for batteries to charge when electricity is cheap and discharge when prices rise.
The storage asset can also provide balancing services and reduce renewable curtailment. The Thessaloniki project is entering operation as Greece’s electricity market produces signals for flexibility. The market differentiation between permitted battery pipelines and assets capable of generating actual revenues is described as increasingly important.
Tender selection and performance metrics for financing
The project was selected under Greece’s first competitive battery-storage tender and benefits from the national recovery and resilience framework. Its operation is positioned as a benchmark for future investments. Developers and lenders can evaluate actual charging costs, discharge revenues, operating availability, degradation, and balancing-market performance.
These metrics are expected to become more important as more batteries enter the Greek market and competition compresses the most profitable trading spreads. The first wave of storage projects may operate in conditions of exceptionally volatile electricity prices, while later projects are described as requiring more sophisticated revenue strategies and stronger operational performance.
Corporate expansion into storage and electricity-market services
For HELLENiQ ENERGY, the investment is described as diversifying a business historically concentrated in refining and petroleum products. The company is expanding into renewable generation, storage, and electricity-market services. Battery assets are described as providing dispatchable electricity that supports a more diversified energy portfolio.
The Thessaloniki facility is presented as evidence that Greece’s storage market is moving beyond project development into real dispatch. Its longer-term importance is linked to how effectively it captures price spreads as competing batteries enter operation.