World’s first grid-scale, semi-solid-state energy storage project goes online

The 100 MW/200 MWh energy storage project featuring lithium iron phosphate (LFP) solid-liquid hybrid cells was connected to the grid near Longquan, Zhejiang Province, China.
kehua semi-solid
The world's first 100 MW large-scale energy storage power station that applied semi-solid-state battery energy storage technology was connected to the grid in China. | Image: Kehua

The world’s first large-scale, semi-solid-state energy storage project was successfully connected to the grid in China on June 6. The 100 MW/200 MWh installation is the first phase of the Longquan Energy Storage project, funded and constructed by state-owned utility Power China.

The project has a total planned capacity of 200 MW/400 MWh spread across a 40-acre site. This project is one of Zhejiang Province’s “14th Five-Year Plan” new grid-side energy storage demonstration projects. It is also the largest energy storage power station in Lishui City, Power China said in a release.

A single charge can store up to 200,000 kWh of electricity, brining the annual discharge to more than 60 million kWh.

The Longquan Energy Storage project employs WeLion’s 280 Ah lithium iron phosphate (LFP) solid-liquid hybrid cells, which have an energy density of more than 165 Wh/kg. The cells are capable of more than 6,000 cycles and have an operating temperature range from -20 to 60 degrees Celsius.

The power conversion system for the project was supplied by Kehua Tech. The Chinese company customized and deployed 25 sets of 5 MW skids for the project. It implemented four 1.25 MW high-performance energy storage converters, which were connected in parallel to a single 5,000 kVA transformer, achieving a 35 kV AC grid-connected output.

According to Kehua, having four energy storage converters in parallel in the centralized energy storage system in combination with the charging and discharging characteristics of semi-solid batteries provides numerous advantages.

“The charging and discharging strategy is automatically adjusted to achieve intelligent management, which greatly improves the overall safety and operational stability of the system,” the inverter manufacturer said in a release.

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  • Marija has years of experience in a news agency environment and writing for print and online publications. She took over as the editor of pv magazine Australia in 2018 and helped establish its online presence over a two-year period.

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