Corsica Sole (independent solar energy producer) has inaugurated Hertz 2, a battery energy storage facility located in Aruküla, Estonia, completing a two-site complex that the French company says constitutes one of the most powerful energy storage installations in continental Europe.

A 200 MW Complex Takes Shape in the Baltics

Hertz 2 has a capacity of 100 MW and a storage capacity of 200 MWh. Combined with Hertz 1, which was commissioned last February at the same location, the two facilities together reach a total capacity of 200 MW and 400 MWh. Corsica Sole describes the combined complex as one of the largest battery energy storage systems in continental Europe.

Both facilities were developed through the Baltic Storage Platform, a joint venture established by Corsica Sole, Evecon, and Mirova. Hertz 2 is connected to the electricity transmission grid operated by Elering, Estonia's national transmission system operator.

The company says the facility is capable of responding to frequency variations within milliseconds, enabling it to provide system services, support the integration of renewable energy into the grid, and help limit fluctuations in the electricity market.

Strategic Timing as Baltic States Synchronize with Continental Europe

The inauguration of Hertz 2 comes as the Baltic countries complete their synchronization with the continental European power grid, a process that has elevated the strategic importance of grid stability infrastructure across Estonia, Latvia, and Lithuania.

Corsica Sole frames the Hertz 2 installation within that context, describing energy storage facilities of this scale as playing a strategic role in strengthening the resilience of the power system and securing electricity supply across the region.

The company notes that when solar or wind generation exceeds consumption, batteries allow available electricity to be stored and released when demand rises, providing a continuous mechanism for balancing supply and demand.

The Hertz 1 and Hertz 2 projects together represent what Corsica Sole describes as the largest private investment made in the Estonian energy sector to date.

Fifteen Years of Island Grid Experience Brought to Continental Scale

Corsica Sole traces its origins in energy storage to work carried out on island power grids, where the absence of large interconnected networks makes battery systems essential to maintaining balance between electricity generation and consumption.

The company describes this background, spanning more than fifteen years, as having built expertise in particularly demanding environments that it is now applying to large-scale continental projects.

With Hertz 1 and Hertz 2, the company says it has demonstrated the ability to manage an entire storage project value chain, covering development, financing, engineering, grid integration, operation, and monetization on electricity markets.

France Initiative Launched Days Before Estonian Inauguration

Shortly before Hertz 2 went online, Corsica Sole co-founded Stockage Énergie France, which it describes as the first professional association in France dedicated specifically to stationary battery storage. The organization was established with the stated goal of contributing to the development of a strong French industry in the energy storage sector.

The timing of that announcement, coming just days ahead of the Estonian inauguration, reflects what Corsica Sole presents as parallel ambitions in both its home market and across Europe.

The company's work on the Baltic Storage Platform projects is described as informing its wider European expansion strategy and feeding directly into its domestic policy and industry development efforts.

Renewable Integration Drives European Storage Demand

Corsica Sole situates the Hertz 2 project within the broader challenge facing European power systems as the share of renewable generation grows. As solar and wind capacity expands across the continent, grid operators face increasing pressure to manage variability in both generation and demand. Large-scale battery storage systems like Hertz 2 are positioned by the company as a core flexibility tool for meeting that challenge.

The facility's connection to Elering's transmission grid means it operates at the system level, providing services that support grid frequency stability rather than serving a single industrial or commercial customer.

This places it among infrastructure assets rather than behind-the-meter installations, a distinction that reflects the scale of investment the Baltic Storage Platform has deployed in Estonia.

With the completion of Hertz 2, Baltic Storage Platform has moved from a development-phase entity to an operational complex managing 400 MWh of capacity connected to one of Europe's major transmission grids. Corsica Sole has indicated that the experience and scale achieved through these projects will continue to inform its development pipeline across Europe.

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