Xiamen, China — May 28, 2026. CATL officially launched its Energy Storage Validation Laboratory (ESVL) in Xiamen, signaling what the company describes as a transformative shift for the global energy storage industry toward a new era of station-level, real-world performance verification. Covering 10 hectares with a total investment of approximately RMB 3 billion (around USD 440 million), the facility stands as the world’s largest and most comprehensive one-stop testing and validation platform for energy storage systems. It is designed to operate as an open, shared infrastructure for the global energy storage ecosystem.
Why Station-Level Validation Is Urgently Needed
The launch of ESVL responds to pressing industry performance challenges. Data shared at the inauguration indicates that nearly 20% of large-scale energy storage power stations worldwide are underperforming, while 46.5% of systems experience grid-connection delays exceeding two months. These gaps are often traced to validation approaches that remain limited to component- or scenario-level testing, leaving full system and station-level performance unverified before deployment.
CATL defines real-world validation as verifying safety, grid-support capability, and long-term reliability at the complete system and station level under the grid’s most demanding conditions—before equipment leaves the factory.
"Scientific rigor is indispensable as energy storage enters the gigawatt era," said Dr. Wu Kai, CATL’s Chief Scientist, at the opening ceremony. "This means being transparent about performance, respecting grid dynamics, and upholding discipline in testing—while elevating industry standards to the station level and shifting validation forward in the delivery process."
Dr. Chen Xiaobo, Head of ESVL, noted that the lab has already established collaborative agreements with leading international certification bodies—including TÜV SÜD, TÜV Rheinland, CGC, and CSA Group—to provide one-test, multi-witness, globally recognized certification services. He emphasized that independent, traceable validation data from ESVL can help regulators make evidence-based decisions, enable insurers to better assess risk, and support financiers in treating energy storage as a more bankable asset class.
Five Specialized Laboratories Setting Global Benchmarks
ESVL’s capabilities are built around five dedicated laboratories, each targeting a critical validation challenge. CATL states the facility establishes multiple world-first achievements in testing scale and technical scope.
Grid Integration Laboratory
Claimed as the world’s first station-level grid integration lab, it features a 35 kV / 100 MVA grid simulator and a real-time simulator—reportedly 14 times larger than the National Renewable Energy Laboratory’s 13.8 kV / 7 MVA platform in the United States. The lab can test over ten large-scale energy storage containers simultaneously, simulate 1,000-node grid topologies, and operate across a 15 Hz to 60 Hz frequency range. Its mission is to validate station-level grid-forming capability and multi-unit coordination in complex grid environments, aiming to improve commissioning safety and reduce deployment timelines.
High-Voltage Safety Laboratory
With a test range from 1 kV to 500 kV, this lab investigates the root causes of fire and explosion under extreme high-voltage stress—including lightning impulse, power-frequency and DC withstand voltage, and partial discharge testing. By mapping safety boundaries for both components and full systems, it seeks to generate design guidance that prevents ignition and explosion failures in the field.
Thermal Safety and Combustion Laboratory
Described as the world’s first large indoor combustion facility equipped with a 20 MW calorimeter, the lab offers 100,000 cubic meters of indoor combustion space. It can conduct simultaneous explosion and fire tests on up to nine large energy storage containers, generating data to inform safety spacing standards, site planning, and system design improvements.
Environment Reliability Laboratory
This lab houses five dedicated chambers—climate, environmental, salt spray, rain, and sand—to subject complete energy storage container systems to extreme real-world conditions. Testing ranges from -50°C to 100°C, with simulated altitudes up to 7,200 meters above sea level. It is designed to validate long-term performance under harsh environments such as desert heat and coastal corrosion.
Electromagnetic Compatibility (EMC) Laboratory
Reportedly the world’s only anechoic chamber capable of accommodating a full 40-foot shipping container, this EMC lab is fitted with a 65-ton turntable and a 5 MW power supply. It enables electromagnetic compatibility testing under actual high-power charge and discharge conditions—addressing a gap that existing global EMC facilities have not been able to close for large-format energy storage units. The goal is to identify electromagnetic interference risks before deployment and enhance the reliability of communication and control systems on-site.
CATL’s Experience Informing the Platform
CATL’s development of ESVL draws on a decade of operational experience that the company says reveals where real-world performance gaps emerge. The company began developing 100 MWh-class lithium-ion battery energy storage technology in 2016, achieved a breakthrough in long-life zero-degradation technology in 2020, and later commissioned a 30 MW / 108 MWh energy storage station in Jinjiang, China.
Since then, CATL has expanded its global energy storage footprint, including projects like the Quinbrook installation in Australia and a large solar-plus-storage facility in North America—the latter of which later secured refinancing at a lower interest rate, a signal of financial market confidence in the asset’s performance.
In 2025, CATL reported energy storage battery sales of 121 GWh, capturing 30.4% of the global market and ranking first worldwide for the fifth consecutive year. The company positions ESVL as the infrastructure needed to sustain and extend that leadership as the industry enters a phase of heightened scrutiny.
An Open Platform for a Competitive Sector
A notable aspect of ESVL’s positioning is its commitment to operating as an open, shared resource for the global energy storage industry—not solely a proprietary CATL facility. Whether competitors will entrust their systems to a platform controlled by the world’s leading battery maker remains an open question, but the involvement of internationally recognized certification bodies from the outset—and the promise of multi-witness, globally accepted test results—is designed in part to address concerns over independence and neutrality.
FAQ
What is ESVL and where is it located?
ESVL (Energy Storage Validation Laboratory) is a 10-hectare testing and validation facility developed by CATL in Xiamen, China, inaugurated on May 28, 2026. It serves as an open platform for the global energy storage industry, offering station-level system testing across five specialized labs.
What makes ESVL the world’s largest energy storage testbed?
ESVL is considered the largest due to its 10-hectare footprint, RMB 3 billion investment, integration of five world-class laboratories, and unique capacity to validate complete energy storage systems at the station level under real operating conditions.
Which certification bodies are partnered with ESVL?
ESVL has established partnerships with TÜV SÜD, TÜV Rheinland, CGC, and CSA Group, enabling one-test, multi-witness, globally recognized certification services for systems validated at the facility.
How does ESVL’s grid integration lab compare to NREL’s platform?
ESVL’s grid integration laboratory operates at 35 kV / 100 MVA, which CATL states is 14 times larger than the National Renewable Energy Laboratory’s 13.8 kV / 7 MVA reference platform in the U.S., making it the largest station-level grid integration testing facility in the world by this metric.
Is ESVL open to companies other than CATL?
Yes. CATL has emphasized that ESVL is designed as open, shared infrastructure accessible to all participants in the global energy storage sector, not limited to CATL’s own products or projects.
Conclusion
The launch of ESVL represents the most substantial single investment in energy storage validation infrastructure to date. If its open-platform ethos is upheld and its data gains widespread trust, the facility has the potential to redefine how the industry approaches pre-deployment verification—shifting the benchmark from component-level checks to full system and station-level accountability.
For developers, grid operators, insurers, and investors navigating a rapidly evolving energy storage landscape, this shift could be transformative. The industry will be watching not only the facility’s technical outputs, but also the standards it sets—and whether those standards become the global reference point CATL envisions.
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