WHES Completes 26-Day Deployment of 1.1MW ESS in Sweden, Enters Spot Market Before Year-End

In the Nordic energy market, characterized by high volatility and tight trading windows, delays directly affect revenue potential. During the 2025 winter season, WHES completed the delivery, installation, and commissioning of a 1.1MW / 2.56MWh commercial and industrial energy storage system in Sweden within 26 days — from contract signing to full grid connection and market participation.

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The project demonstrated WHES’s capability to execute rapid deployments while maintaining high standards of product reliability, engineering quality, and operational readiness.

Time-Critical Replacement Requirement

In late November 2025, Greenvoltis, a well-known Swedish VPP optimization service provider, received a time-critical request from a customer whose existing energy storage system had experienced repeated failures. As a result, the system was unable to participate in market trading ahead of the peak winter electricity price period, creating an immediate risk of revenue loss.

Given the limited timeframe, Greenvoltis initiated a supplier search focused on proven technical reliability, compliance with Swedish grid requirements, local equipment availability, and the ability to execute a rapid deployment within the remaining weeks of the year.

European Inventory and Regulatory Compliance Enable Rapid Deployment

WHES maintains four international warehouses, including a central European hub in the Netherlands, where standard energy storage system configurations are kept in stock to support time-critical projects. This localized inventory enabled immediate equipment availability for the Swedish deployment.

The system supplied for the project holds key international and regional certifications, including UL9540A, UN38.3, EN 50549, IEC 62933, and Sweden-specific EIFS 2018:2 third-party approvals. In addition, the system is registered with Energiföretagen, enabling an accelerated grid connection approval process.

Project timeline:

  • December 1 — Solution confirmed and contract signed
  • December 9 — Payment completed
  • December 19 — Equipment shipped from the Netherlands warehouse and delivered to site
  • December 22 — Installation completed
  • December 23 — On-site engineers completed integration of the WHES OS energy management system with Greenvoltis’s trading platform, enabling millisecond-level dispatch response
  • December 24 (Christmas Eve) — System commissioned and entered the Nordic spot and FFR markets

By completing delivery, integration, and commissioning within a single execution window, the system was operational and ready to generate market revenue immediately upon commissioning.

 

Rapid Deployment Supported by Proven Technical Performance

The compressed deployment timeline was supported by the system’s robust technical design and operational capability. The installed solution features:

  • Battery modules powered by CATL cells combined with WHES in-house power conversion systems (PCS), supporting low degradation and extended cycle life
  • Reliable operation across a temperature range of –20°C to 55°C, suitable for Nordic climate conditions
  • An integrated WHES OS energy management system enabling intelligent dispatch optimization
  • Support for frequency containment reserve (FFR) response times below 100 milliseconds, in line with Nordic ancillary service requirements

Local equipment availability in Europe eliminated the typical 6–8 week overseas shipping timeframe, enabling order-to-operation completion within a single month.

WHES’s prior experience with multiple ESS and VPP integrations across Europe supported efficient communication protocol alignment, dispatch testing, and platform integration during the project execution.

A Repeatable Delivery Model, Not a One-Off Execution

This project reflects WHES’s integrated delivery model, combining a global logistics network, localized European inventory, and end-to-end service capabilities to support time-critical energy storage deployments.

To date, WHES has delivered more than 600 energy storage system projects across over 50 countries, supporting commercial and industrial, grid-scale, virtual power plant, and microgrid applications.

As electricity markets continue to evolve and become more dynamic, customers increasingly require solutions that can be deployed quickly, operate reliably under demanding conditions, and achieve consistent market participation.

WHES continues to focus on delivering energy storage systems that meet these requirements through standardized processes, proven technology, and predictable operational performance.