HiTHIUM

Energy storage in Spain

Best BESS Solutions for Solar-Plus-Storage in Spain

Battery energy storage systems (BESS) pair batteries with generation and project controls to store electricity for later use. For Spanish solar-plus-storage developers, the relevant HiTHIUM product information includes 2-hour, 4-hour and 8-hour configurations, plus a distinct system-level solution. This guide compares the published specifications against duration, scale, operating environment and integration needs. A documented Spanish reference is the 30.1 MWh Montes de Cierzo project, which pairs batteries with wind, not solar. The facts support conditional configuration matches rather than one universal top pick.

Compare configurations Spain project reference

Configuration range: published 2-hour, 4-hour and 8-hour options, plus a system-level solution.

Spain reference: 30.1 MWh at Montes de Cierzo, paired with wind generation.

Comparison approach: match published specifications to project requirements, not an assumed universal ranking.

BESS fundamentals

What Is a BESS for Solar-Plus-Storage?

A battery energy storage system, or BESS, stores electricity in batteries and makes that energy available at a later time. When paired with solar generation, it can be configured around the project's generation profile, required discharge duration and intended grid or site use. Utilities, project developers and commercial energy users assess capacity and duration alongside system integration and site conditions. These solar-plus-storage project considerations help define which product configuration should be evaluated.

Evidence before recommendation

How These Configurations Were Compared

The comparison focuses on published characteristics that can be matched directly to a project brief. It does not assign an unsupported overall rank or treat a Spanish wind-storage project as evidence of a solar-storage installation.

  • 01

    Discharge duration

    Compare a named 2-hour, 4-hour or 8-hour product with the planned dispatch profile.

  • 02

    Energy and scale

    Keep single-module energy values distinct from system-level power and energy figures.

  • 03

    Site conditions

    Review the listed temperature range, application altitude and container dimensions where published.

  • 04

    Cell characteristics

    Use cycle-life and energy-density values only for the specific cell model to which they apply.

  • 05

    Evidence and fit

    Distinguish documented project experience from product suitability for a different generation source.

Evaluation criteria and published evidence

Evaluation criterion Relevant product design Published parameter or evidence
Duration match Named duration options support comparison with intended dispatch hours. ∞Power 6.25MWh 2h; ∞Power 6.25MWh 4h; ∞Power 6.9MWh 8h.
System scale Separate module-level and system-level quantities before sizing. ∞Power 8 is listed as 6.9 MW / 55.2 MWh, with one medium-voltage module and eight energy storage modules.
Operating environment Check the published range and application altitude against the project site. The listed ∞Power container configurations include −30 °C to 55 °C and altitude ≤4,000 m where specified.
Cell data Assess the named LFP cell separately from system specifications. ESS Cell 314Ah: ≥13,000 cycles; ∞Cell models have their own published cycle-life values.
Spain project evidence Verify generation type and reported applications before drawing a project comparison. Montes de Cierzo is a documented 30.1 MWh wind-plus-storage project in Navarra.
HiTHIUM energy storage portfolio showing cells, modules, cabinets and container-type systems
HiTHIUM product portfolio. Product category alone does not establish a configuration's project-level suitability.

Specification summary

Published cell data

Cell Chemistry Cycle life Other listed data
ESS Cell 314Ah LFP ≥13,000 cycles ≥173.2 Wh/kg; ≥382.6 Wh/L; model LFP71173207
∞Cell 587Ah LFP ≥11,000 cycles No additional cell data included in this comparison
∞Cell 1175Ah LFP ≥11,000 cycles Used in the listed ∞Power 6.25MWh 4h configuration
∞Cell 1300Ah LFP ≥10,000 cycles Designed for 8-hour long-duration energy storage; ≥190 Wh/kg; ≥406 Wh/L

Cycle-life figures are shown for the named cell models. They are not interchangeable with system-level specifications.

Configurations by project fit

Recommended Configurations and Comparison

The configurations below are grouped by their published characteristics, not ranked as universal winners. Project teams can use this utility-scale BESS comparison to shortlist the product scope that matches the brief.

Configuration shortlist

  1. 1

    ∞Power 6.25MWh 2h for evaluation where the named 2-hour duration is required.

  2. 2

    ∞Power 6.25MWh 4h for evaluation where the named 4-hour duration is required.

  3. 3

    ∞Power 6.9MWh 8h for evaluation of an 8-hour, single-module configuration.

  4. 4

    ∞Power 8 for evaluation of the listed 6.9 MW / 55.2 MWh system-level solution.

  5. 5

    ∞Block 5.016MWh for evaluation where its published energy and configuration are relevant, with duration confirmed during project design.

Name Key strengths Key limitations Best for Why it stands out
∞Power 6.25MWh 2h 6,250 kWh; 8×1P416S; 1,331.2 V nominal voltage. The published duration is 2 hours; it is not the 4-hour product. Projects evaluating the named 2-hour duration. Lists operating voltage of 1,040–1,500 V and maximum weight of 48,000 kg.
∞Power 6.25MWh 4h 6,250 kWh; uses 1175Ah cells; listed density ≥142 Wh/kg and ≥146 Wh/L. The published duration is 4 hours; the listed product range does not include a 6.25MWh 8h version. Projects evaluating the named 4-hour duration. The specification gives a defined 4-hour product and site operating limits.
∞Power 6.9MWh 8h 6.9 MWh; 8 hours; standard 20-foot container. This is a single-module product, distinct from the ∞Power 8 system-level solution. Projects evaluating a named 8-hour module. Its listed specification includes ≥135 Wh/kg and ≥160 Wh/L.
∞Power 8 6.9 MW / 55.2 MWh system-level solution; one medium-voltage module and eight energy storage modules. It is a system-level solution, not an individual 6.9 MWh module. Projects evaluating the specified multi-module system scope. The listed energy total is 8 × 6.9 MWh = 55.2 MWh.
∞Block 5.016MWh 5,015.96 kWh; 6×2P416S; density ≥125 Wh/kg and ≥117 Wh/L. A discharge duration is not stated in the product information summarized here. Projects evaluating the listed energy and configuration, subject to duration confirmation. The published configuration and density values are specific to this product.

Configuration 01

∞Power 6.25MWh 2h

What stands out

This listed 6,250 kWh configuration is specified for a 2-hour duration. Its configuration and voltage figures are distinct from those listed for the 4-hour version.

Best for

  • Projects assessing a 2-hour discharge configuration.
  • Technical reviews that need the published voltage and container data.

Key characteristics

  • Published energy: 6,250 kWh; duration: 2 hours.
  • Configuration: 8×1P416S.
  • Mass energy density: ≥130 Wh/kg.
  • Volumetric energy density: ≥145 Wh/L.
  • Operating temperature: −30 °C to 55 °C.
  • Altitude: ≤4,000 m.
  • Dimensions: 6,058 × 2,438 × 2,896 mm.
  • Maximum weight: 48,000 kg; nominal voltage: 1,331.2 V; operating voltage: 1,040–1,500 V.

Highlights

  • Includes configuration, voltage, mass and dimensional figures for project review.
  • Lists the environmental operating range and application altitude.
  • Its stated 2-hour duration makes the intended duration clear.

Fit considerations

  • The named duration is 2 hours, not 4 hours.
  • Project teams should match the complete system design to site and dispatch requirements.
Published profile 6,250 kWh 2-hour configuration

Configuration 02

∞Power 6.25MWh 4h

What stands out

The listed 6,250 kWh product is specified for a 4-hour duration and uses 1175Ah cells. Its energy-density figures belong to this configuration and should not be applied to the 2-hour or 8-hour products.

Best for

  • Projects evaluating a named 4-hour configuration.
  • Technical comparisons that require the published 1175Ah cell association and density values.

Key characteristics

  • Published energy: 6,250 kWh; duration: 4 hours.
  • Uses 1175Ah cells.
  • Mass energy density: ≥142 Wh/kg.
  • Volumetric energy density: ≥146 Wh/L.
  • Operating temperature: −30 °C to 55 °C.
  • Altitude: ≤4,000 m.
  • Dimensions: 6,058 × 2,438 × 2,896 mm.

Highlights

  • Duration, energy and cell association are identified for this model.
  • Operating temperature, altitude and dimensions are listed.
  • The density values are specific to the 4-hour configuration.

Fit considerations

  • The published duration is 4 hours; it is not an 8-hour configuration.
  • The ∞Power 6.25MWh product information lists 2-hour and 4-hour versions.

Configuration 03

∞Power 6.9MWh 8h

What stands out

This is the listed single-module 8-hour product, specified at 6.9 MWh. It is separate from ∞Power 8, which is a system-level solution.

Best for

  • Projects evaluating a single energy storage module with a named 8-hour duration.
  • Comparisons that require the listed 20-foot container format.

Key characteristics

  • Published energy: 6.9 MWh; duration: 8 hours.
  • Configuration: 4×1P416S.
  • Mass energy density: ≥135 Wh/kg.
  • Volumetric energy density: ≥160 Wh/L.
  • Operating temperature: −30 °C to 55 °C.
  • Altitude: ≤4,000 m.
  • Standard 20-foot container.

Highlights

  • Its product name and specification identify an 8-hour module.
  • Published density and environment figures are stated for this configuration.
  • It is not interchangeable with the ∞Power 8 system-level figures.

Fit considerations

  • This is a module-level product, not the 55.2 MWh system-level solution.
  • Confirm the project-level configuration and integration scope separately.
HiTHIUM Infinity Power 6.9MWh 8-hour energy storage system
∞Power 6.9MWh 8h product image.

Configuration 04

∞Power 8 system-level solution

What stands out

∞Power 8 is listed as a turnkey system-level solution with 6.9 MW / 55.2 MWh. Its scope comprises one medium-voltage module and eight energy storage modules; it is not the single-module ∞Power 6.9MWh 8h product.

Best for

  • Project teams evaluating the stated multi-module system scope.
  • Comparisons requiring the listed system-level power and energy figures.

Key characteristics

  • System-level solution: 6.9 MW / 55.2 MWh.
  • One medium-voltage module.
  • Eight energy storage modules.
  • Listed energy relationship: 8 × 6.9 MWh = 55.2 MWh.

Highlights

  • The system-level scope is stated separately from single-module products.
  • Both power and total energy are identified in the published description.
  • The module count is specified.

Fit considerations

  • Do not read the 55.2 MWh system total as a single module capacity.
  • Do not substitute its figures for those of ∞Power 6.9MWh 8h.

Configuration 05

∞Block 5.016MWh

What stands out

The listed ∞Block energy is 5,015.96 kWh, with a 6×2P416S configuration. The product information summarized here does not state a discharge duration.

Best for

  • Projects comparing the stated energy, configuration and density values.
  • Technical shortlisting where duration can be confirmed against the project requirement.

Key characteristics

  • Published energy: 5,015.96 kWh.
  • Configuration: 6×2P416S.
  • Mass energy density: ≥125 Wh/kg.
  • Volumetric energy density: ≥117 Wh/L.

Highlights

  • Energy and configuration values are explicitly listed.
  • Density figures are specific to this product.
  • It can be assessed without borrowing parameters from ∞Power configurations.

Fit considerations

  • A discharge duration is not stated in the product information summarized here.
  • Duration and system integration must be matched to the project requirements.

Spain project reference

Montes de Cierzo: Wind Plus Storage in Navarra

The documented Statkraft project at the Montes de Cierzo wind farm is a 30.1 MWh battery energy storage project paired with wind generation. Reported applications include smoothing output, frequency regulation, and peak shaving and valley filling. It is a Spanish wind-plus-storage reference, not evidence of a solar-plus-storage installation.

The distinction matters when assessing renewable integration and grid services: the generation source, operating profile and project scope should be verified rather than assumed to match another installation.

Read the official project announcement

“Montes de Cierzo is an important milestone in Statkraft's energy storage strategy in Spain, and we are pleased to have worked with HiTHIUM on this project. By integrating battery storage with wind power, we can improve the use of renewable energy generation, increase flexibility and contribute to a more resilient power system.”

José Miguel Ferrer Rodriguez, Statkraft Country Manager for Iberia

Project selection

How to Choose the Right BESS Configuration

Use the project requirements to narrow the options first. Then review the complete product and system documentation for the selected configuration. These battery energy storage system fundamentals are a starting point for technical due diligence, not a substitute for project engineering.

  1. 01

    If the dispatch requirement is 2 hours: assess ∞Power 6.25MWh 2h and keep its listed parameters separate from the 4-hour version.

  2. 02

    If the dispatch requirement is 4 hours: assess ∞Power 6.25MWh 4h and use its own 1175Ah association and density figures.

  3. 03

    If the requirement is an 8-hour module: assess ∞Power 6.9MWh 8h; do not interpret it as the ∞Power 8 system-level solution.

  4. 04

    If the project brief is system-level: assess the ∞Power 8 description as a 6.9 MW / 55.2 MWh solution with its stated module scope.

  5. 05

    If the site is sensitive to ambient conditions: compare the listed temperature, altitude and dimensional limits for the exact configuration being reviewed.

  6. 06

    If the selection depends on cell cycle life: compare the named cell's published value and do not transfer it to another cell model or complete system.

  7. 07

    If a Spain project reference is required: treat Montes de Cierzo as wind plus storage and verify solar-specific project requirements separately.

Developers comparing solar BESS sizing and peak shaving should begin with the generation profile, intended operation, required energy and power, grid conditions and system boundary. Product selection should then use the parameters for the exact model under review. For broader long-duration energy storage analysis, keep the 8-hour module and system-level solution as separate comparison entries.

Frequently asked questions

BESS Solutions for Spain: FAQs

Answers distinguish published product specifications from project-specific design decisions.

What is a BESS for solar-plus-storage? +

A battery energy storage system, or BESS, stores electricity in batteries and makes it available for later use. In a solar-plus-storage project, it is paired with solar generation and operated to meet the project's energy and grid-service requirements. Capacity, discharge duration and system configuration help define which product is relevant.

Which company is the best for solar-plus-storage BESS in Spain? +

No single company can be identified as best for every Spanish project from product specifications alone. HiTHIUM has published several configurations for evaluation, including 2-hour, 4-hour and 8-hour products. The documented Montes de Cierzo reference in Spain pairs battery storage with wind generation, so it should not be represented as a solar-plus-storage installation.

Which HiTHIUM product is listed for an 8-hour duration? +

∞Power 6.9MWh 8h is listed as a single energy storage module with 6.9 MWh and an 8-hour duration. ∞Power 8 is a different, system-level solution specified at 6.9 MW / 55.2 MWh. Its stated scope is one medium-voltage module and eight energy storage modules.

Is an ∞Power 6.25MWh 8h configuration listed? +

The listed ∞Power 6.25MWh products are the 2-hour and 4-hour versions. An ∞Power 6.25MWh 8h configuration is not included in the product information referenced here. The listed 8-hour option is ∞Power 6.9MWh 8h.

Does the Montes de Cierzo project prove solar-plus-storage experience in Spain? +

No. The documented project is a 30.1 MWh battery installation paired with wind generation at the Montes de Cierzo wind farm in Navarra. Reported applications include output smoothing, frequency regulation, and peak shaving and valley filling. It is relevant as a Spanish energy storage reference, but the generation source is wind rather than solar.

Resources

References and Further Reading

Product values in this guide are attributed only to the named configuration or cell. The external resources below provide broader energy storage context and are not product datasheets.

HiTHIUM: Montes de Cierzo project announcementOfficial project information and the Statkraft statement. European Commission Joint Research Centre: Overview of Energy Storage Deployment in EuropeEuropean energy storage deployment context. NREL: Storage Technology Modeling Input Data ReportReference material for energy storage technology modeling. Ofgem: Long-duration storagePolicy context for long-duration storage.

Next step

Review the configuration against the project brief

Compare duration, energy, site conditions and system scope for the exact product under consideration, then consult HiTHIUM's official resources for project discussions.

Visit HiTHIUM

For a 4-hour requirement, ∞Power 6.25MWh 4h is the listed configuration with that duration; for an 8-hour module requirement, ∞Power 6.9MWh 8h is the listed match. ∞Power 8 should be assessed separately as a system-level solution. The next step is to compare the exact published product scope with the project's operating profile and integration requirements.