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TERMOELEKTRARNA BRESTANICA D.O.O. has gone to market for the design and construction of a new battery energy storage system. The Battery Energy Storage Construction contract bundles design, delivery, installation, testing, connection and documentation into a single package, illustrating how energy-sector buyers are increasingly procuring storage as a turnkey project.

Full project scope from design to connection

Published on 11th May 2026, the notice sets out a concise but far-reaching brief. The selected contractor will be expected to design the battery energy storage system, deliver all required equipment, install it, carry out testing, connect the system and prepare the necessary documentation.

The notice does not specify technical parameters such as capacity or technology, but the scope makes clear this is not a simple hardware purchase. Instead, TERMOELEKTRARNA BRESTANICA D.O.O. is looking for a partner to take the project from concept through to an operational asset.

That approach mirrors the direction of travel in other recent battery storage procurements. In November 2025, Trianel BESS 1 GmbH & Co. KG launched a contract for the engineering, procurement and construction of a lithium-ion battery storage facility in Germany, including the infrastructure needed for operation. In April 2026, EVH GmbH sought a contractor for the turnkey construction of a large battery storage system in Mühlstedt, Saxony-Anhalt.

Also in April 2026, ČEZ, a. s. issued a contract covering the design, preparation of documentation and execution of construction works for a battery storage system and related equipment at the Dětmarovice power plant. Teplárny Brno, a.s. is procuring the completion of a battery energy storage system project with defined output and capacity requirements, explicitly including the development and approval of technical documentation. Taken together, these schemes show utilities treating storage as a full construction and engineering project rather than an add-on component.

Documentation and integration move to the foreground

A notable feature of the Brestanica notice is the explicit inclusion of documentation preparation within the core scope. This reflects a wider pattern in storage tenders where paperwork, permitting and systems integration are set out as central deliverables.

For the HSE group, HOLDING SLOVENSKE ELEKTRARNE d.o.o. is seeking a partner to design, supply, install, commission and maintain battery storage systems, with the contractor responsible for securing the necessary project documentation and permits. Lippeverband’s February 2026 tender for the turnkey delivery and installation of a complete battery storage system likewise underlines integration, requiring power electronics, low-voltage connections and the ability to link into central control technology.

Municipal and regional buyers are taking a similar line. Gemeente Groningen is procuring the supply, installation and maintenance of a battery storage system, while Derry City and Strabane District Council, in a January 2026 notice, is seeking contractors to design, supply, install and integrate solar photovoltaic systems and battery energy storage solutions across two depots, offered in separate lots. In both cases, installation and on-site integration sit alongside equipment supply.

Compared with these more detailed descriptions, Brestanica’s contract is strikingly compact, but the wording still signals that testing, grid connection and documentation will be treated as integral parts of the job, not as follow-on packages. Suppliers can assume that capability across all these stages will be scrutinised once the full tender documents are in hand.

Storage projects proliferate across sectors and sizes

Although TERMOELEKTRARNA BRESTANICA D.O.O. is focusing on a single new asset, its tender lands amid a broad wave of storage projects across Europe. Recent notices span industrial energy savings schemes, city depots, wastewater facilities, science parks and space infrastructure.

In November 2025, EUROLOGIS s.r.o. set out a project that combines expansion of a photovoltaic power plant with the construction of a battery energy storage system, implementation of energy management, lighting replacement and ongoing maintenance as part of an energy savings initiative. In January 2026, PACT - Parque do Alentejo de Ciência e Tecnologia, SA launched a procurement for the acquisition and installation of equipment for photovoltaic energy production, battery storage systems and electric mobility services, linking storage directly with on-site generation and e-mobility.

Public authorities are also using storage to support renewable generation. Derry City and Strabane District Council is targeting solar and battery installations at two depots. In April 2026, Municipiul Craiova published a contract for the design and execution of a battery-based electric energy storage system for a photovoltaic power plant in Craiova, with aims of enhancing renewable energy integration and optimising energy operations. Regione Autonoma della Sardegna, meanwhile, is procuring the supply and installation of a battery energy storage system as part of the REFUEL Project under the Just Transition Fund in Italy.

Specialist infrastructure owners are joining in. The Centre National d'Etudes Spatiales is running a consultation, published in December 2025, to define technical and functional requirements for the supply and installation of a battery energy storage system at the Guiana Space Centre. Vilniaus vandenys is tendering for electricity storage devices, including design services and installation works, for facilities operating on electrical networks up to 10 kV. In March 2026, Verdo Produktion A/S in Denmark launched a project to deliver and install a battery energy storage system to provide backup power, enhance grid support and optimise energy costs.

At the larger end of the spectrum, ENEA Nowa Energia sp. z o.o. is buying components for a battery energy storage system with a target usable capacity of 840 MWh, with at least 600 MWh of that to be purchased within 24 months. Slovenské elektrárne, a.s. is procuring the supply, construction and commissioning of a battery storage system with a minimum installed capacity of 89 MW at a nuclear power plant site. Liechtensteinische Kraftwerke has issued a prior information notice for a storage system of at least 25 MW / 50 MWh for delivery to Balzers, where a building permit has already been secured and the future contractor will be responsible for delivery and commissioning.

Smaller but still strategic schemes are evident too. Omgevingsdienst Drenthe is seeking supply and maintenance of energy storage systems, including a system with four battery packs totalling 1040 kWh. Versorgungsbetriebe Bordesholm GmbH is looking for delivery, installation, commissioning and optional maintenance of battery containers for a storage system intended to optimise electricity marketing from a nearby ground-mounted photovoltaic park. Städtische Werke AG, via its procurement service, is tendering for the delivery, installation and maintenance of a large battery storage system at the Fieseler Foundation in Kassel, designed for flexible marketing across different energy markets and connected to the local distribution network.

Implications for suppliers and the market

Set against this range of projects, Brestanica’s move to procure a new storage asset under a single contract reinforces three themes that now recur in battery storage tenders.

• End-to-end responsibility. Many buyers now expect one supplier or consortium to handle the full chain of design, equipment supply, construction works, testing and commissioning, and sometimes maintenance. This is stated explicitly in notices from HOLDING SLOVENSKE ELEKTRARNE d.o.o., Derry City and Strabane District Council and Vilniaus vandenys, and is implicit in Brestanica’s requirement for design, delivery, installation, testing and connection in one lot.
• Integration and control. New battery systems are expected to slot into wider operational and market frameworks. Lippeverband calls for integration with central control technology, EUROLOGIS s.r.o. is coupling storage with an energy management system, and Versorgungsbetriebe Bordesholm GmbH and Städtische Werke AG both highlight the role of storage in optimising electricity marketing and participation in various energy markets.
• Documentation and permitting. Contracts from ČEZ, a. s., Teplárny Brno, a.s. and HOLDING SLOVENSKE ELEKTRARNE d.o.o. all build documentation development, approvals and permitting into the scope of works. Brestanica’s requirement for documentation preparation places its own tender firmly in this camp.

For companies examining the Brestanica opportunity, this means that competitiveness is likely to rest as much on project delivery capability as on battery technology. Experience in managing interfaces with grid operators, producing robust technical documentation and bringing assets to a fully operational state is becoming as important as supplying cells and inverters.

The notice for the construction of a battery energy storage system at the RTP Labore location, published on 11th May 2026 by GORENJSKE ELEKTRARNE, proizvodnja elektrike, d.o.o., underlines that TERMOELEKTRARNA BRESTANICA D.O.O. is not alone among energy producers pursuing storage. Alongside that project, the group-wide procurement by HOLDING SLOVENSKE ELEKTRARNE d.o.o., where actual orders will depend on the contracting authority’s needs, suggests a growing role for battery systems across multiple sites and use cases.

Outlook

The brief public description of TERMOELEKTRARNA BRESTANICA D.O.O.’s battery storage contract leaves many technical details to the full tender documents, but the scope already places it within a fast-evolving market for engineered storage projects. As this competition progresses, observers will be watching how far the contract prioritises long-term services such as maintenance and optimisation, and whether future tenders from similar buyers lean towards component-led models like ENEA Nowa Energia’s 840 MWh procurement or the large-capacity, site-specific builds now under way at Slovenské elektrárne and Liechtensteinische Kraftwerke.

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