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Battery Energy Storage Systems

Towards a more efficient energy transition

Renewable energy’s market share is growing fast worldwide, with the goal of outgrowing fossil fuels and embracing CO2-neutral energy supplies Energy storage enables all this green electricity to be used efficiently, ensuring electricity grids remain stable.

The Energy Storage Market in Spain is set for significant growth and transformation within the next years. This is driven by a combination of regulatory support, technological advancements, and the country’s commitment to meet the targets set out in the National Integrated Energy and Climate Plan 2021-2030 (PNIEC) whose renewable generation already surpasses 60% (source: Red Eléctrica).

We at BayWa r.e. are globally active in developing and realising wind, solar, as well as energy storage and green hydrogen projects. Our project development experience and technical expertise give us a comprehensive understanding of local requirements for battery storage systems (BESS), both as standalone and hybrid solutions.

Furthermore, at BayWa r.e. we prioritize the integration of our developments in the local community, seeking a positive long-term impact and a contribution to the local economy and its people.

How does storage work?

Renewable Generation

The increasing penetration of renewable sources challenge the stability of the grid. Battery Energy Storage Systems (BESS) can supplement this stability and thus enable further RES deployment. Specially, for the Iberian market, BESS comes along as a solution for one of its biggest challenges, curtailment. The more solar and wind projects connect to the grid, the more curtailment. Energy Storage would play a crucial role in solving this problem.


Underground cables connect all of the components.

Lithium-Ion Batteries

The heart of the project, housed in cabinets, the battery modules are stack up, serialized and parallelized together to form the battery banks which are then connected to the power electronic inverters and then to the grid. The cabinets are temperature controlled, and the battery modules refrigerated to be maintained within its optimum working temperature range. All our BESS are certified to all the applicable H&S standards and are also equipped with a variety of sensors and active safety systems. The appropriate DC Disconnecting Switches and Fast Fuses allow the system to be disconnected remotely, manually or automatically when needed.


The electrical substation serves as a connection point to the national energy market.


Convert the DC current from the batteries to the AC current of the electrical grid and transfer the energy charging and discharging between the BESS, the Renewable Sources and the Grid.

BESS Controller

The brain of the project, BESS Controller safely operates the system, according to the logic hierarchy designed to optimize the charging and discharging of the batteries based on the battery technical parametrization and the market signals. Similarly, a control system will monitor and ensure that the BESS operates under optimal electrical and environmental conditions.


Transformers adapt the output voltage of the BESS to the grid’s.

In order to maintain the grid frequency at its designated value, such as 50 Hz in Europe and Spain, a harmonious equilibrium between electricity generation and demand is imperative within the electrical system. Any imbalance, with either one predominating, results in a deviation from its nominal frequency. To advert this from happening, the grid operator activates a frequency control power, which is a control mechanism used when generation and consumption are not in harmony. BESS can efficiently provide these ancillary services for frequency control quickly and cost-effectively, thereby ensuring security of supply.

How We Can Help You

At BayWa r.e., we are working on the development of large-scale stationary storage systems, either coupled with wind and photovoltaic energy or as standalone storage.

  • We design projects individually, coordinating both development and implementation as a unified front.

  • We undertake the planning, technical design, and construction of the project.

  • State-of-the-art maintenance plans, seamless 24/7 monitoring, and on-site services ensure smooth operation for your battery storage system as well as wind and solar.

Our BESS projects in numbers

PV/wind with BESS projects in evaluation and development
GW hybrid projects in the pipeline (PV/wind with BESS)
GW standalone BESS projects in the pipeline
MW in the flexibility marketing

Frequently asked questions about battery energy storage solutions

  • Why is the flexibility of storage solutions so important?

    The flexibility provided by energy storage solutions is crucial for several key reasons:

    • Adaptability to demand: Energy needs can vary significantly throughout the day or depending on weather conditions. Storage solutions play a crucial role providing flexibility by storing power during low demand, and releasing it again when demand is high.
    • Integration of intermittent renewable energies: Renewable energy sources such as solar and wind are inherently intermittent and may not always be available when energy is needed. Flexible storage allows excess energy produced during periods of high generation to be stored and supplied when generation is low, ensuring a smooth and efficient integration of these sources into the electrical grid.
    • Grid stability: Flexible storage solutions can provide stability to the electrical grid by quickly supplying power in case of sudden fluctuations. This helps maintain the reliability and security of the electrical supply.
    • Manageability: Storage flexibility allows for more effective management of load and energy demand, facilitating the implementation of Flexible Demand Management strategies, such as optimizing electric vehicle charging and participating in rapid demand response programs.

    Finally, in our transition to decarbonized grids, Battery Energy Storage Systems (BESS) can provide the necessary backup to compensate for the inertia and synchrony that would otherwise be lost as energy shifts away from synchronous generators powered by fossil fuels.

  • What are the benefits of partnering with BayWa r.e.?

    Decades of experience in renewable energy gives us extensive know-how and a worldwide professional network. We’re a quality-oriented full-service provider with a solid financial background. Our expert teams around the world have extensive knowledge of regional and local conditions. From project design to completion, we remain your trusted partner throughout the entire lifespan of a large-scale storage system.

  • How important are storage projects for the success of the energy transition?

    Very! Large-scale BESS reduce the need for expensive grid expansions. By combining high efficiency and fast reactivity, they balance short-term differences between supply and demand.

    They also enable renewables to be integrated into the electricity grids more reliably and widely. In the future, we’ll see a diversified landscape of storage solutions to enable the transition to netzero.

  • Which technologies does BayWa r.e. use for large-scale battery storage?

    We deploy lithium-ion (li-ion) batteries valuing their versatility, their high energy density and safe performance despite frequent cycling. In a Lithium-Ion system, about 90% of the stored energy is recovered and used again. Li-ion batteries are scalable and modular, so systems are adaptable and may be scaled-up to fit any size. They’re also more widely available, competitive and technology mature and with a long track record of projects worldwide. 

    Our development teams are always exploring new technologies. We’re in close contact with manufacturers to diversify our technology portfolio. Sodium-ion batteries, for example, have potential to compete with li-ion. Realising this potential represents a big step forward, making batteries less resource-intensive and with more localised value chains.  

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