China Connects World’s First Large-Scale Semi-Solid State Energy Storage Project to Grid

China has achieved a significant milestone in with the successful grid connection of the world's first large-scale semi-solid state project on June 6. The project, a 100 MW/200 MWh installation, represents the inaugural phase of the Longquan Energy Storage project, funded and constructed by state-owned utility Power China.

Spanning a 40-acre site in Province, the Longquan project is part of the province's “14th Five-Year Plan” for new grid-side energy storage demonstration projects, and stands as Lishui City's largest energy storage power station, Power China announced.

Each charge of the installation can store up to 200,000 kWh of electricity, enabling an annual discharge exceeding 60 million kWh.

The Longquan Energy Storage project utilizes WeLion's 280 Ah iron phosphate (LFP) solid-liquid hybrid cells, boasting an energy density surpassing 165Wh/kg and capable of over 6,000 cycles. These cells operate within a temperature range from -20 to 60 degrees Celsius.

Tech supplied the power conversion system for the project, customizing and deploying 25 sets of 5 MW skids. The system incorporates four 1.25 MW high-performance energy storage converters, synchronized in parallel to a single 5,000 kVA transformer, achieving a 35 kV AC grid-connected output.


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