IN Brief:
- Modlany Energy Park combines 42.7MW of solar with 37.95MW/41.7MWh of storage.
- Eleven liquid-cooled containers are connected through a high-voltage substation.
- The system is configured for frequency regulation, balancing, and short-duration solar shifting.
Contemporary Nebula Technology Energy has supplied the battery system for the Modlany Energy Park in northern Czechia, where 42.7MW of photovoltaic generation is paired with 37.95MW/41.7MWh of storage. The installation uses 11 STAR T-285 liquid-cooled containers connected through a high-voltage substation.
Each container is rated at 3.45MW and 3.793MWh, giving the full plant a little over one hour of storage at maximum output. That ratio suits frequency regulation, balancing, and short-duration solar shifting rather than prolonged coverage of renewable shortfalls. The battery can absorb excess photovoltaic output and return it when demand, prices, or system conditions make the energy more useful.
CNTE describes Modlany as the largest completed battery storage project in the Czech Republic. The project appeared on the company’s project pages in July, followed by a fuller technical announcement on 4 August, so the current disclosure provides system detail for an installed scheme rather than announcing a new construction start.
The energy park occupies a former mining spoil area near Teplice, reusing disturbed industrial land for generation and storage. Such sites can reduce pressure on undeveloped land, although they require careful treatment of ground stability, drainage, access, and foundations before heavy battery containers and electrical equipment are installed.
The high-voltage connection is central to the operating model. Frequency regulation requires the battery to respond rapidly to changes in system balance, charging or discharging under control instructions. Protection settings, metering, communications, and dispatch must therefore coordinate the battery and photovoltaic plant without breaching the site’s connection limits.
CNTE specifies 1P charging and discharging for the selected system, meaning the power rating is broadly equivalent to the energy capacity over approximately one hour. The STAR T platform can be configured for longer-duration applications, but the Modlany design favours rapid response and repeated balancing activity.
Liquid cooling manages cell temperature across the containers, helping to limit uneven ageing during frequent cycling. The company also specifies four levels of fire protection, targeted alarm positioning, and continuous DC insulation monitoring. Those features form part of the safety design, although site spacing, detection, suppression, emergency access, maintenance, and operating procedures remain equally important.
An energy management system and cloud platform provide monitoring and control. The software must decide how much capacity is available for solar shifting, how much remains reserved for frequency services, and when charging would create an undesirable peak at the connection point. These priorities can conflict, making dispatch strategy a major determinant of revenue and battery life.
The relationship between the photovoltaic plant and battery also defines what the project can deliver. Solar capacity is slightly higher than battery power, while the 41.7MWh energy rating cannot hold a full day of production. The battery is designed to reshape shorter periods of output and provide controllable system response rather than turn the solar plant into continuous generation.
For the Czech network, a 37.95MW battery adds a meaningful source of fast flexibility as variable renewable capacity increases. Storage can reduce the amount of short-term reserve carried by conventional generators, provided the system is qualified for the relevant services and remains available when called. The release does not disclose the exact market contracts, revenue structure, or proportion of capacity allocated to each service.
The project also gives CNTE a European reference at a time when suppliers face stricter requirements around grid codes, cybersecurity, certification, emergency planning, and local service support. Delivery of containers is only the first part of that obligation. Operators and investors will also judge availability, warranty performance, spare-parts support, and response to faults over the working life of the plant.
Repeated cycling will provide evidence on thermal control, efficiency, and cell balance under real conditions. Performance may vary with ambient temperature, dispatch pattern, and the interaction between solar production and balancing instructions. Those operating records will be more valuable than nameplate specifications when future Czech and European projects assess the platform.
Modlany now moves from construction evidence to operational evidence. The plant must maintain communications with market and grid systems, deliver instructed power accurately, and coordinate with photovoltaic output without exceeding connection limits. Its 37.95MW power rating makes it a substantial regional balancing asset, while its 41.7MWh capacity gives it a specific role: frequent, controlled flexibility rather than an all-purpose answer to renewable variability.
