This use case was originally published by Pixii AS on November 12, 2024. Reproduced with permission.
ENGIE’s first battery storage system in Slovakia, utilizing Pixii’s PowerShaper technology, began operations in January 2024. This BESS is integral to ENGIE’s multi-phase project, enhancing grid stability, supporting renewable energy integration, and laying the groundwork for future energy flexibility services in Slovakia.
The challenge
As part of its strategic vision for Slovakia’s energy future, ENGIE launched a multi-phase project to drive renewable energy growth, ensure grid stability, and provide energy flexibility. ENGIE required a solution capable of delivering Frequency Control Reserve (FCR), integrating intermittent renewables like photovoltaics, wind and biogas, and managing imbalance, with the ability to expand as future energy demands evolve.
The solution
ENGIE deployed a 1.25 MW Pixii BESS at the Veľká Ida Industrial Park. Built using Pixii’s modular PowerShaper technology, this system connects directly to the 110 kV substation, providing real-time frequency regulation by supporting Frequency Control Reserve (FCR) for SEPS, Slovakia’s Transmission System Operator.
The BESS can adjust its power output within 30 seconds to maintain grid stability, a critical requirement for effective FCR services.
"The project of constructing and operating ENGIE’s first battery storage in Slovakia is a significant milestone for our company. As one of the European leaders in energy transformation, we have long aimed to approach this segment comprehensively. We have transitioned from a heat supplier to a provider of comprehensive energy services, focusing on achieving decarbonization goals."
The Benefits
Pixii’s PowerShaper technology delivers both immediate and long-term benefits for ENGIE. The system ensures grid stability with its rapid response capabilities, meeting SEPS’s FCR requirements and managing fluctuations caused by renewable energy sources. Its modular design allows ENGIE to expand capacity as more renewable energy is integrated, smoothing out supply-demand imbalances and reducing reliance on fossil fuels during high-demand periods.
Pixii’s dynamic value stacking, which allows the system to perform multiple services simultaneously, enables the BESS to participate in energy markets, opening revenue opportunities in demand response and energy arbitrage. This multi-functional capability enhances grid performance and maximizes the return on investment. Pixii’s solution also positions ENGIE to offer energy flexibility services, allowing customers to better manage their energy consumption while advancing Slovakia’s clean energy transition.
" Our PowerShaper technology is designed to meet the evolving needs of energy leaders like ENGIE. By enabling flexible, scalable energy storage, we are proud to support ENGIE’s multi-phase project and help Slovakia accelerate its path to a sustainable energy future. "
The results
Since its launch in January 2024, ENGIE’s battery storage system has been successfully stabilizing the grid and supporting the integration of renewable energy sources. With phase one completed, ENGIE is already laying plans to expand the system as energy demands grow and new opportunities arise. The collaboration with Pixii ensures that ENGIE remains at the forefront of Slovakia’s energy transformation, equipped with the tools needed to adapt to a rapidly changing energy market.
Case details
| Objective | Ensure grid stability, integrate renewable energy, and offer energy flexibility through a scalable energy storage solution |
| Project | Veľká Ida Industrial Park BESS |
| Industry | DSO/DNSP |
| Country | Slovakia |
Background
ENGIE is a global leader in the energy sector, specializing in providing low-carbon energy and services. With a focus on sustainability and innovation, ENGIE operates across multiple areas, including power generation, natural gas, and energy efficiency services. The company’s mission is to accelerate the transition toward a carbon-neutral world by addressing energy, industrial, and digital transitions.
MTS spol. s r.o. is a key partner for Pixii, acting as both a contract manufacturer and the exclusive sales representative in Slovakia, the Czech Republic, and Hungary.
Technical overview
| Solution | 1.25 MW Pixii PowerShaper BESS |
| Grid integration | Connected to a 110 kV substation, providing real-time Frequency Control Reserve (FCR) for Slovakia’s Transmission System Operator (SEPS) |
| Modularity | The system’s modular design allows seamless expansion as energy demand and renewable capacity grow |
| Capacity | 1.25 MW initial installed capacity, with future phases planned for additional scaling |
Project contacts
Pixii s.r.o.
E-mail: post@pixii.com
Visiting address: Hollého 4456/1,
031 01 Liptovský Mikuláš, Slovakia
Project manager Pixii
Roman Pavlik
MTS Slovakia
E-mail: roman.pavlik@mts.sk
Applications/functions in use:
Frequency support
Deliver rapid energy adjustments to stabilize grid frequency and maintain system balance. This service helps minimize deviations from nominal frequency, ensuring regulatory compliance, improving grid reliability, and reducing the risk of outages and system disturbances.
FCAS (Frequency Control Ancillary Services)
Rent out battery capacity to provide immediate support in the frequency control market, helping stabilize the grid. This service prevents outages, supports virtual power plant initiatives, and generates revenue for the battery owner.
Photo credits: Pixii AS.