Pilot Energy Supplies PCS for World’s First Large-scale Semi-solid-state BESS Power Plant

In June 2024, the world witnessed a significant milestone in energy innovation — the successful grid connection of the world’s first large-scale semi-solid-state battery energy storage system (BESS) power plant. The 100MW/200MWh lithium iron phosphate energy storage project in Zhejiang Province, China, marks a breakthrough that significantly enhances the safety, flexibility, and resilience of the East China power grid.

Pilot Energy is proud to have supplied the BESS PCS (Power Conversion Systems) for this pioneering project. Leveraging our deep technical expertise, we delivered 25 sets of 5MW BESS PCS solutions, customized through several rounds of professional design discussions to optimize system efficiency and performance.

A Breakthrough in Semi-solid-state BESS Technology

This project, the largest of its kind in Lishui City, Zhejiang, is the first to combine semi-solid-state batteries with an advanced grid-side BESS PCS solution.
Pilot Energy deployed an innovative architecture by integrating four high-performance 1.25MW energy storage converters into each 5MW module. These converters are connected in parallel to a 5,000kVA transformer, achieving a stable 35kV AC grid output, and ensuring seamless, high-efficiency energy delivery.

Our advanced PCS technology not only maximized energy conversion efficiency but also ensured excellent grid compatibility and high system flexibility, receiving high praise from the project stakeholders.

Intelligent Management through Parallel PCS Integration

One of the standout features of this project is the intelligent management system enabled by parallel-connected BESS PCS units. By synchronizing four converters and incorporating the unique charging and discharging characteristics of semi-solid-state batteries, the system can automatically adjust operational strategies.

This approach provides:

• Smart load balancing
• Real-time charge/discharge optimization
• Enhanced safety and operational stability

By intelligently adapting to real-world grid and battery conditions, Pilot Energy's solution sets a new benchmark for reliability and efficiency in utility-scale energy storage systems.

Significant Environmental and Grid Benefits

The project's impact extends beyond technical achievement:

• Energy Storage Capacity: 200,000 kWh per cycle
• Annual Energy Dispatch: Over 60 million kWh
• Coal Savings: Approximately 23,000 tons of standard coal per year
• CO₂ Emission Reduction: Around 72,000 tons annually

The BESS plays a critical role in peak shaving, valley filling, and stabilizing renewable energy inputs, supporting the local grid in its transformation toward a cleaner, more resilient energy infrastructure.

About Pilot Energy

With over two decades of innovation in energy storage systems (ESS) and power electronics, Pilot Energy has emerged as a trusted global leader in BESS PCS technology, microgrid solutions, and renewable energy integration.
By the end of 2023, Pilot Energy’s global deployments have exceeded:

• 47GW of PV installations
• 16GW/8.5GWh of energy storage capacity

Recognized as one of the Top PCS suppliers worldwide (S&P Global) and a leading Tier 1 BESS integrator, Pilot Energy continues to drive the future of clean energy by delivering high-performance, intelligent, and sustainable energy solutions.

Why Choose Pilot Energy for BESS PCS Solutions?

• Proven Expertise: Extensive project experience with semi-solid, lithium-ion, and flow battery systems.
• Intelligent Control: Advanced EMS (Energy Management Systems) integrated with PCS for smart, adaptive operation.
• Flexible System Design: Scalable from commercial to utility-scale applications.
• Superior Grid Compatibility: Outstanding AC-DC conversion efficiency and seamless grid interaction.
• Sustainability Commitment: Helping customers worldwide achieve their carbon neutrality goals.

Looking to build your next BESS project with cutting-edge PCS technology?
Partner with Pilot Energy to unlock smarter, safer, and more sustainable energy storage solutions!

Learn more about our BESS PCS technology and solutions here