Polish renewable energy contractor ONDE has secured a new contract to construct a major battery electricity storage facility for an unnamed global investor in the renewable energy sector, with the project expected to be operational by the end of 2027. The installation is described as currently one of the largest of its kind in both Poland and Europe.

Scope of the Contract

ONDE's role in the project covers construction and electrical work for the battery electricity storage facility, known in the industry as a BESS, as well as the construction of a substation on site.

The company, which is headquartered in Toruń and describes itself as a contractor and developer specializing in renewable energy, will carry out the work on behalf of a client described only as a global developer of renewable energy projects.

The identity of that investor has not been disclosed publicly. The project is expected to reach completion by the end of 2027. No specific location for the facility has been named in the announcement.

Scale and Capacity

The facility under construction is described as one of the largest electricity storage installations currently being built in Poland and across Europe. According to ONDE, a full load from the facility would be sufficient to power more than 500,000 households continuously around the clock.

No figure for the total storage capacity in megawatt-hours or gigawatt-hours was provided in the company's announcement. The scale of the project places it within the context of a broader national push to expand battery storage infrastructure.

Poland's National Energy and Climate Plan projects that the total capacity of battery storage in the country is expected to more than quadruple by 2040, reaching 8.7 gigawatts.

That growth is anticipated to include both large-scale standalone storage facilities and installations built alongside wind farms as complementary infrastructure.

Second Storage Contract in Recent Weeks

ONDE's announcement noted that this contract represents the second agreement the company has signed in the electricity storage segment within a short period of time.

The company did not provide details about the first contract but indicated that work on further projects in the segment is ongoing. Paweł Przybylski, President of ONDE, framed the contract as a logical progression for the company, given conditions in the energy sector.

"This contract is another natural step in the global energy transformation, necessary to stabilize the energy mix, which, along with the decline in cell prices and the demand for grid balancing, has become one of the most promising in the industry," Przybylski said.

"This is the second contract in the electricity storage segment signed by ONDE in recent weeks. We are working intensively on further projects." His comments point to a convergence of factors driving demand for large-scale battery storage, including falling battery cell prices and growing requirements for grid balancing as renewable energy sources make up a larger share of national power systems.

ONDE's Position in the Renewable Energy Sector

ONDE operates as both a contractor and a developer in the renewable energy space. The company is registered in Toruń and trades under the KRS number 0000028071. Its most recent publicly reported financial results, announced on 13 April 2026, indicated revenue growth and improved margins for the 2025 financial year, though no specific figures from those results were included in the storage project announcement.

The battery storage contract adds to ONDE's portfolio of energy infrastructure work and reflects an accelerating trend across Europe toward large-scale energy storage deployment.

As countries across the continent increase the share of intermittent renewable sources such as wind and solar in their electricity grids, the ability to store surplus generation and release it during periods of high demand has become a critical component of grid management.

Industry Context

The announcement comes at a time when the battery energy storage market across Europe is attracting significant investment from both domestic and international developers.

The declining cost of lithium-ion battery cells has made large-scale projects increasingly commercially viable, while regulatory and grid management requirements have created financial incentives for storage operators in many markets, including Poland.

Poland's National Energy and Climate Plan, referenced in ONDE's announcement, sets out an expectation that battery storage capacity will grow to 8.7 gigawatts by 2040.

That target reflects both the anticipated expansion of renewable generation and the need for flexible capacity to manage the variability that comes with it. Storage facilities of the scale described in the ONDE contract are positioned to play a central role in meeting that target, providing bulk storage that can be deployed independently of individual wind or solar installations or used to complement them directly.

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