IN Brief:
- Tavion has started building a 20 MW/40 MWh battery installation in Bydgoszcz, with connection targeted for 2027.
- Esix Polska is delivering balance of plant works, alongside battery integrator HyperStrong and owner's engineer Ayesa.
- The project forms part of a three-site, 69 MW construction programme backed by €50 million of financing announced in September.
Tavion has started construction of its first battery energy storage park in Poland, beginning work on a 20 MW/40 MWh installation in Bydgoszcz. The inaugural groundbreaking took place on 8 October 2026, with the public construction announcement following on 12 October. Connection to Enea Operator’s distribution network is targeted for the second quarter of 2027 as Tavion advances the first three projects within its Polish portfolio.
The two-hour installation is being delivered with Esix Polska responsible for balance of plant works, battery system integrator HyperStrong and owner’s engineer Ayesa. Tavion expects a second project at Luboń to begin construction within two weeks of the Bydgoszcz announcement, with a third installation planned to follow.
The construction milestone follows a €50 million financing package announced in September, comprising €34 million of equity and €16 million of debt. The funding supports Tavion’s initial three battery parks, which together have a planned power capacity of 69 MW. The company is developing a broader portfolio of storage assets across Poland, although only the first site has been confirmed as having begun construction in the latest announcement.
Bydgoszcz’s 20 MW rating represents the maximum nominal power available for charging or discharging, while its 40 MWh energy capacity allows approximately two hours of operation at full rated output under nominal conditions. The usable duration during commercial operation will depend on the system’s operating limits, conversion losses and the quantity of energy available at the start of a dispatch period.
The Bydgoszcz battery will connect to Enea Operator’s regional distribution network, with import and export limits set by the agreed connection terms and local network capability. Protection and control settings must be coordinated with the distribution network’s operating requirements.
HyperStrong’s involvement covers battery system integration, bringing together the storage equipment and its operating systems. Battery modules store and release direct-current electricity, while the power conversion system provides the interface with the alternating-current network. The final installation must coordinate these functions with battery management, plant controls and the electrical protection required at the connection point.
Esix Polska’s balance of plant responsibilities encompass the supporting infrastructure necessary to turn the storage equipment into a functioning electrical installation. Depending on the approved project design, these works may involve foundations, cable routes, electrical collection systems, transformer infrastructure and other site services. Tavion has not published a detailed division of individual construction packages or confirmed the final transformer configuration.
Ayesa provides Tavion with independent technical oversight, reviewing engineering designs, equipment interfaces, construction progress and compliance with project specifications. The equipment suppliers and construction contractors retain responsibility for delivering and installing their respective systems.
Before grid connection, the battery must demonstrate that its controls can follow charging and discharging instructions within the plant’s electrical and thermal limits. Protection systems must respond correctly to faults, and the network interface requires testing and acceptance before commercial operation.
The battery’s fast power response could support balancing and flexibility services once the necessary market qualifications and network conditions are met. The specific services and dispatch limits will depend on the plant’s technical approval, connection conditions and commercial arrangements.
State of charge constrains the duration of every discharge event, and the battery must recharge before repeating an equivalent delivery. Commercial scheduling must therefore account for available stored energy, conversion losses, market commitments and equipment operating limits.
Poland’s increasing deployment of solar and wind generation is creating additional interest in storage facilities capable of responding to variations in renewable output. Battery installations can absorb electricity when production exceeds immediate demand and release it during other periods. Bydgoszcz’s two-hour nominal duration positions it for shorter flexibility requirements, while longer imbalances require additional resources.
Tavion has not disclosed the battery energy capacities or individual connection specifications for the other two parks in its initial programme. Their operating durations and grid acceptance schedules must therefore be established for each site rather than inferred from Bydgoszcz’s 20 MW/40 MWh configuration.
The September equity round was led by Leitmotif and Oberon Capital, with participation from existing investors BackingMinds and Course Corrected. The associated debt financing provides additional capital for developing and constructing the initial portfolio. Tavion has said that further equity and debt will be needed to complete its wider programme.
That programme includes approximately 184 MW of projects at or approaching ready-to-build status in Poland, together with a wider development pipeline of around 1.7 GW. The figures describe prospective capacity at different stages of development and should not be treated as commissioned storage or projects with all construction funding secured.
Grid connection capacity, land agreements and planning permissions are important determinants of how quickly battery projects can move into construction. Tavion has indicated that these arrangements across its advanced portfolio have either been secured or are approaching completion, but the status of individual projects may differ. The start of physical works at Bydgoszcz provides a more advanced delivery milestone than the earlier portfolio financing announcement.
Construction at Bydgoszcz must now progress through installation, electrical integration, testing and network acceptance before the facility can import and export electricity commercially. Its stated grid connection target remains 2027, while construction at Luboń is expected to follow and the third site’s programme has not yet been specified in detail.
