China launches 400MWh mega battery storage system

February 15, 2026

China has officially activated the world’s first 400 megawatt-hour (MWh) grid-scale energy storage facility powered by 628 ampere-hour (Ah) ultra-large battery cells, marking a major advancement in utility-scale battery technology and grid reliability. The project strengthens power grid stability and ensures a consistent electricity supply as demand continues to grow.

Landmark utility-scale deployment of 628Ah battery technology

The groundbreaking 200MW/400MWh battery energy storage station, commissioned on January 31, represents the first real-world, utility-scale application of 628Ah lithium-ion battery cells. The facility is located in Lingshou County, Hebei Province, in northern China.

Developed with core technology supplied by EVE Energy, a global leader in lithium battery manufacturing for electric vehicles and energy storage, the installation demonstrates how high-capacity battery cells can enhance grid performance, efficiency, and reliability.

The Ruite New Energy Lingshou facility includes:

• 80 units of Mr. Giant 5MWh direct-current (DC) energy storage systems

• 40 integrated power conversion system (PCS) cabins

• Advanced large-format lithium battery architecture designed for utility applications

This configuration enables large-scale energy storage and rapid energy dispatch when needed.

Major breakthrough in China’s energy storage innovation

According to EVE Energy, the successful deployment confirms that 628Ah mega battery cells meet critical requirements for modern power grids, including safety, operational efficiency, and extended service life.

The company also revealed that cumulative production of these high-capacity cells has exceeded one million units, highlighting strong manufacturing capability and commercial readiness.

EVE Energy emphasized that its industrial leadership includes being the first company to announce, mass-produce, and deploy batteries of this size at scale, validating both production reliability and technology maturity.

Larger battery cells improve efficiency and lower costs

Compared to conventional smaller battery formats, ultra-large battery cells significantly reduce system complexity. Fewer individual cells are required per installation, resulting in:

• Simplified system architecture

• Faster installation timelines

• Reduced maintenance requirements

• Lower total operating and ownership costs

• Improved Levelized Cost of Storage (LCOS)

The storage system incorporates advanced safety features, including durable separators, optimized stacking technology, and enhanced structural integrity. These innovations improve overall safety while maximizing performance and lifecycle efficiency.

Company representatives described the project as a major milestone, moving large-format battery technology from experimental stages into full commercial deployment.

Strategic partnerships and expansion of large-scale battery deployment

Alongside the project launch, EVE Energy signed a strategic 10 gigawatt-hour (GWh) agreement with Beijing Guowang Power Technology to accelerate future deployments of large-format battery systems.

Senior leadership from both organizations attended the commissioning ceremony, formalizing plans to expand collaboration on utility-scale energy storage projects.

This partnership signals a shift in the industry toward greater emphasis on advanced battery technologies and integrated energy solutions, rather than purely scaling capacity.

Supporting renewable energy integration and grid stability

The demand for high-capacity battery energy storage systems is rapidly increasing worldwide, driven by the expansion of renewable energy sources such as solar and wind power. These intermittent energy sources require reliable storage solutions to balance supply and demand.

Large-format battery systems like the 628Ah mega cell platform provide key benefits, including:

• Improved renewable energy integration

• Enhanced grid flexibility and stability

• Faster response to power fluctuations

• Increased reliability of electricity infrastructure

EVE energy’s vision for global energy storage leadership

EVE Energy stated that it will continue advancing large-format battery technology while expanding its global production, service, and partnership capabilities. The company aims to accelerate the transition toward clean energy by delivering scalable, safe, and cost-effective storage solutions.

Through ongoing innovation and collaboration, EVE Energy is positioning itself as a global leader in advanced battery technology and energy storage ecosystem development.