Xiamen, China – May 28, 2026. CATL has officially opened a major new testing facility in Xiamen. Called the Energy Storage Validation Laboratory (ESVL), the site aims to help move the global energy storage industry toward a new standard of real-world, system-level testing before projects are deployed. Covering 10 hectares and built with an investment of about 3 billion yuan (approx. $440 million USD), the company says it is the world’s largest and most comprehensive one-stop testing platform for energy storage systems. CATL intends to run it as an open facility, available for use by the wider industry worldwide.
The Need for Better Testing
The launch of ESVL comes as the industry faces performance challenges. Data presented at the opening suggests that close to 20% of large-scale energy storage power stations globally are not meeting expectations. Furthermore, 46.5% of these systems experience delays of more than two months in connecting to the power grid. Industry experts point to a testing problem: most validation today is done on individual parts or in limited scenarios, leaving the performance of the complete, fully assembled system largely unproven until it’s installed on-site.
CATL defines "real-world validation" as proving the safety, grid-support ability, and long-term reliability of an entire energy storage system—under the toughest real grid conditions—before it leaves the factory.
"Scientific rigor is more important than ever as energy storage enters the gigawatt era," said Dr. Wu Kai, CATL’s Chief Scientist, at the opening ceremony. "This means being truthful about performance, respecting the complexities of the power grid, and maintaining strict discipline in testing. We need to raise quality standards to the system level and bring that validation forward to before delivery."
Dr. Chen Xiaobo, Head of ESVL, said the lab is already working with major international certification bodies, including TÜV SÜD, TÜV Rheinland, CGC, and CSA Group. The goal is to offer testing that, once performed, is recognized by multiple parties globally. He argued that independent, traceable data from ESVL can help regulators, let insurers better assess risk, and make energy storage a more reliable asset for banks to finance.
Five Labs, Multiple Capabilities
The technical strength of ESVL lies in its five specialized laboratories, each built to tackle a specific validation challenge. CATL says the complex sets new global benchmarks for testing scale.
Grid Integration Lab
Called the world’s first station-level grid integration lab, it is equipped with a 35 kV / 100 MVA grid simulator. The company states this setup is 14 times larger than a comparable platform at the U.S. National Renewable Energy Laboratory. It can test more than ten large energy storage containers at once, simulate complex grid networks, and aims to verify how complete systems interact with and support the grid, potentially making site commissioning faster and safer.
High-Voltage Safety Lab
This lab tests equipment from 1 kV to 500 kV. It is designed to study what causes fires and explosions under extreme high-voltage stress, such as from lightning strikes. By finding the safety limits of both parts and full systems, it aims to provide design guidance to prevent failures in the field.
Thermal Safety and Combustion Lab
Described as the world’s first large indoor combustion site with a 20 MW calorimeter, this lab has enough space to conduct explosion and fire tests on up to nine large storage containers simultaneously. The data is meant to help set safety standards for how systems are spaced and deployed.
Environment Reliability Lab
This lab has five test chambers that expose full container systems to extreme conditions like intense heat, cold, salt spray, rain, and sand. It can simulate temperatures from -50°C to 100°C and high-altitude conditions. The goal is to prove systems can last in harsh real-world environments like deserts or coastal areas.
Electromagnetic Compatibility (EMC) Lab
This is described as the world’s only anechoic chamber big enough to hold a full 40-foot shipping container. With a large turntable and high-power supply, it can test for electromagnetic interference while the system is actually charging and discharging at full power—a key gap in current testing for large-scale storage.
Built on a Decade of Experience
CATL’s move to build ESVL is based on ten years of hands-on experience, which the company says shows where real-world performance problems start. The company began work on 100 MWh-scale lithium-ion storage in 2016, made a breakthrough in long-life technology in 2020, and then built a 30 MW / 108 MWh storage station in Jinjiang, China.
Since then, CATL’s storage projects have expanded internationally, including in Australia and North America. In 2025, CATL reported selling 121 GWh of energy storage batteries, claiming a 30.4% global market share. The company sees ESVL as the necessary infrastructure to maintain its lead as the market demands higher proof of performance.
An Open Platform for the Industry
A key part of ESVL’s plan is to operate as an open, shared resource for the global storage industry, not just for CATL’s own use. It remains to be seen whether competitors will be comfortable testing their systems at a facility owned by the world’s largest battery maker. The early involvement of international certifiers is likely an effort to ease such concerns by providing a degree of independent oversight.
FAQ
What is ESVL?
ESVL is CATL’s new Energy Storage Validation Laboratory in Xiamen, China. It’s a large-scale testing facility for complete energy storage systems, opened in May 2026.
Why is it considered the world’s largest?
Due to its 10-hectare size, the scale of its five specialized labs, and its unique ability to test full station-level systems under real operating conditions.
Which certification bodies are involved?
ESVL has partnerships with TÜV SÜD, TÜV Rheinland, CGC, and CSA Group to provide globally recognized test reports.
How does its grid lab compare to others?
CATL states its 35 kV / 100 MVA grid simulator is significantly larger than a key platform at the U.S. National Renewable Energy Laboratory, making it the biggest of its kind.
Can other companies use ESVL?
Yes. CATL has stated the facility is intended to be an open platform for the global industry, not just for its own products.
Conclusion
The opening of ESVL is a major development for the energy storage industry. If it operates as a truly open platform and its data is widely trusted, it could change how the world tests and validates large-scale storage projects, shifting the focus to proving full-system performance before installation. For everyone involved in building, financing, and insuring these projects, that change could be very significant. The industry will be watching to see if the standards set here become the new global benchmark.
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