A major energy group is procuring design, build and maintenance services for battery storage systems, reflecting growing demand for flexible power capacity.
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HOLDING SLOVENSKE ELEKTRARNE d.o.o. has launched a contract for the design, supply, installation, commissioning and maintenance of battery storage systems across its group. The move places battery energy storage at the centre of its infrastructure plans and mirrors a steady rise in similar procurements by utilities, municipalities and other operators across Europe.
Published on 31st March 2026, the battery systems construction contract sets out a broad remit. The project covers the design, supply, installation, commissioning and maintenance of battery storage systems for the HSE group. It also includes responsibility for project documentation and for securing building permits.
The inclusion of documentation and permits makes clear that the buyer expects suppliers to handle more than hardware delivery. Contractors will be responsible for turning a high-level storage requirement into a deliverable project that satisfies technical, planning and regulatory demands.
The tender text also notes that actual orders will depend on the contracting authority’s needs. That points to a flexible, needs-driven approach: the contract is intended as a vehicle through which the group can order battery systems over time, rather than a single, fixed project from day one.
Other recent procurements show how such systems are being used once in place. Municipal and local projects describe battery storage as a way to optimise electricity management and consumption, and to enhance the operation of existing generation assets. The HSE contract gives the group a structure to pursue similar aims wherever storage proves most effective within its portfolio.
The scope set out by HOLDING SLOVENSKE ELEKTRARNE d.o.o. is part of a wider pattern. Many buyers are now bundling design, construction and long-term responsibilities into single procurements.
In October 2025, PGE Inwest 22 Sp. z o.o. issued a contract for the design and implementation of a complete electric energy storage facility in Gryfino. That procurement covers “all necessary documentation, permits, installations, and services”, echoing HSE’s insistence that suppliers manage the full project lifecycle rather than just deliver equipment.
Also in October 2025, the Public University of Navarra launched a tender to supply and install a battery-based electric energy storage system for its internal grid. The contract there includes both the drafting of the technical project and the installation of the system, again combining design with delivery in a single package.
Smaller-scale projects follow the same line. In Bystřany, a municipality tendered in November 2025 for the delivery and installation of a photovoltaic power plant with a battery storage system on the roof of a retirement home. The notice covers documentation, assembly, training and the establishment of an energy management system. The choice to wrap project development, installation and operational know-how together is now common.
Long-term responsibility is another shared theme. The HSE contract explicitly includes maintenance. In November 2025, Omgevingsdienst Drenthe sought an agreement for the supply and maintenance of an energy storage system built around four battery packs with a total capacity of 1,040 kWh. In January 2026, Versorgungsbetriebe Bordesholm GmbH went to market for the delivery, installation, commissioning and optional maintenance of battery containers for a storage system linked to a nearby ground-mounted photovoltaic park, with the goal of optimising electricity marketing.
Reliability is just as central where batteries are used for backup rather than large-scale storage. In December 2025, the Bulgarian Road Infrastructure Agency launched a contract to supply and install batteries for uninterruptible power supply devices at data centres and stationary control points, in order to “ensure reliable operation” of an electronic road toll system. Here, as in HSE’s case, buyers are using procurement to secure long-term resilience, not only to acquire assets.
Some tenders underline the scale at which storage is now being planned. ENEA Nowa Energia sp. z o.o. published a contract on 2nd April 2026 for the supply of components for a battery energy storage system with a total target capacity of 840 MWh. The buyer guarantees at least 600 MWh of orders within 24 months, while allowing for advances and the possibility of increasing the order scope. That level of volume planning gives a sense of the market HSE is entering.
The HSE group-wide approach sits alongside a diverse set of storage projects across Europe, stretching from hydropower plants to homes.
On the generation side, PRIVATE JOINT STOCK COMPANY “UKRHYDROENERGO” published a contract in March 2026 for the design, supply and installation of battery energy storage systems with energy management systems and ancillary equipment at multiple hydropower plants in Ukraine, including training for staff. The emphasis on integrated energy management and operator training highlights how complex plant-level storage projects have become.
Other utilities are targeting specific power stations and network assets. ČEZ, a. s. issued a notice on 26th March 2026 for a battery storage project at the Dětmarovice power plant, covering design, preparation of documentation and execution of construction work for storage and related equipment. Netz Niederösterreich GmbH, in a contract published on 15th January 2026, is procuring the delivery, installation, assembly and commissioning of various battery systems for substations and network stations. Lippeverband’s tender of 27th February 2026 seeks turnkey delivery and installation of a complete battery storage system, including power electronics, low-voltage connections and integration into central control technology.
Storage is also being deployed to support renewable schemes and local grids. Municipiul Craiova’s contract of 30th March 2026 concerns the design and execution of works for an electricity storage system in batteries to enhance the operation of a photovoltaic power plant in Craiova, explicitly “supporting sustainable energy development and integration of renewable sources”. In Obec Ludgeřovice, a notice published on 2nd April 2026 calls for the delivery, installation and commissioning of photovoltaic power plants with battery storage at five locations, combined with engineering activities and staff training.
At the municipal and household level, storage is being linked directly to consumption. In Gmina Miejska Ciechanów, a contract from 18th November 2025 covers the design, delivery, installation and commissioning of energy storage systems for eight public utility buildings and 162 private homes, aimed at “optimizing electricity management and consumption”. The City of Helsinki’s Urban Environment Division has gone further, creating a dynamic procurement system for property batteries and other energy storage solutions in a notice of 23rd January 2026, allowing interested candidates to apply for participation throughout its duration.
Several buyers are also combining storage with electric mobility. The municipality of Zawiercie is procuring, under a contract dated 8th January 2026, the design, supply and installation of photovoltaic systems with energy storage for its municipal transport company, including necessary permits and modernisation of electrical installations. free heating s.r.o., in a notice of 20th November 2025, is buying charging stations for electric vehicles together with battery storage, covering accessories, transport, technical documentation and expert supervision. Pražská energetika, a.s. is setting up a dynamic purchasing system, published on 10th December 2025, for construction and electrical installation work for charging stations.
Even where the focus is not on grid-connected storage, public buyers are expanding their battery fleets. Magyar Közút Nonprofit Zrt., in a contract of 24th December 2025, is acquiring 2,700 starter batteries and 450 work batteries for vehicles and equipment used in public road maintenance. MÁV Pályaműködtetési Zrt. is procuring various stationary battery bank groups, including OPzS and OPzV liquid and gel electrolyte batteries and VRLA lead batteries, with orders placed under a framework contract based on the contracting authority’s needs. The metro operator METROPOLITEN EAD, through a notice dated 20th October 2025, is purchasing a range of new and original batteries to ensure continuous operation of the metro.
Alongside deployment, some buyers are investing in testing and system knowledge. Politechnika Wrocławska’s contract of 27th February 2026 covers the delivery of a multifunctional battery simulator with communication interfaces for testing electric vehicles and charging stations, including installation and commissioning at Wroclaw University of Technology.
The HSE contract’s clause that actual orders will depend on the contracting authority’s needs reflects a broader shift towards flexible procurement models in the battery sector.
ENEA Nowa Energia’s April 2026 component contract builds in a guaranteed minimum order within a set period but leaves room to increase volumes. MÁV’s December 2025 battery bank procurement is explicitly structured as a framework contract, with orders placed as required. The City of Helsinki has chosen a dynamic procurement system for property batteries, allowing suppliers to join over its lifetime. These approaches reduce the risk of locking buyers into a single set of specifications in a market where technologies and prices are evolving.
Technical and integration requirements are also becoming more nuanced. Kotkan Julkiset Kiinteistöt Oy’s notice of 10th March 2026, for an energy storage battery system for its properties, requires aggregator independence and compliance with Fingrid’s technical standards. Omgevingsdienst Drenthe defines a specific capacity (1,040 kWh) and pairs supply with maintenance. Lippeverband and Ukrhydroenergo both stress integration with central control or energy management systems. Universities and municipalities, from Navarra to Bystřany and Ciechanów, bundle training and energy management functions into their contracts.
Against this backdrop, HOLDING SLOVENSKE ELEKTRARNE d.o.o.’s decision to procure design, documentation, installation, commissioning and maintenance in one package is consistent with how many other buyers are tackling storage. It places responsibility for performance, compliance and long-term operation clearly with the contractor, while giving the group flexibility over when and where to order systems.
The key unknowns for the HSE contract are how many battery systems will ultimately be ordered and how they will be distributed across the group’s assets. The wording leaves scope for a rolling programme of projects, activated as needs emerge.
Across Europe, the timeline of recent notices – from the university and municipal tenders of October and November 2025, through the framework and dynamic purchasing arrangements of December 2025 and January 2026, to large component orders and plant-level projects in February, March and April 2026 – suggests that battery procurement is moving from pilot projects into routine infrastructure planning.
For HOLDING SLOVENSKE ELEKTRARNE d.o.o., the new contract creates a route to deploy storage wherever it adds most value, backed by suppliers able to handle design, permitting, construction and maintenance. For the wider market, it is another sign that battery systems are now a standard part of how energy bodies, cities and infrastructure operators think about system resilience and electricity management.
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