Benchmark Project | Wuzhong Ruichu Technology Quanyan Substation 100MW/200MWh Energy Storage Project
Since being connected to the grid at the end of March 2025, the Wuzhong Ruichu Technology Quanyan Substation 100MW/200MWh Energy Storage Project has been operating stably for over a year. As a benchmark application of 100MW-class string-based energy storage, the project has demonstrated stable operational performance and strong overall returns, providing another practical example of the commercial operation of energy storage for large-scale renewable energy bases.
Located in Weizhou Town, Tongxin County, Wuzhong City, the project comprises 20 energy storage units, each rated at 5.022MW/10.044MWh. Each unit consists of 27 eBlock-372 units and one 5,500kVA dry-type, three-phase, dual-winding transformer. After aggregation through 35kV box-type transformers, the system connects to the 35kV side of the project's dedicated 110kV step-up substation via four 35kV collector circuits.
01.
Let the Data Speak
Higher Efficiency, Better Returns
Ultimately, the performance of an energy storage power station comes down to three key questions: Is its efficiency high enough? Is its operation stable enough? And are its returns strong enough? The Ningxia Tongxin Quanyan Substation Energy Storage Project provides clear answers through its performance data.
System efficiency: Above 86%, with overall station efficiency consistently ranging from 86% to 87%—approximately 2 percentage points higher than the industry average.
Online availability: As high as 99.9%. Throughout more than a year of operation, the equipment has remained stable, with an extremely low failure rate.
Overall returns: From commissioning at the end of March 2025 through August 2026, the project accumulated 100,589 MWh of charging energy and 86,534 MWh of discharging energy. Among energy storage power stations of comparable scale in Ningxia, its cumulative charging and discharging volumes have consistently ranked among the top three, while its overall returns have also ranked among the leading performers.
02.
In Partnership with Customers, United in Purpose
Greater Operational Confidence, Easier Maintenance
Higher efficiency and better returns are largely attributable to the inherent advantages of the string-based energy storage architecture. With one PCS per battery cluster, the system achieves cluster-level electrical decoupling, with no parallel connections on the DC side. This eliminates the conditions for circulating currents at their physical source and overcomes the “barrel effect” associated with centralized solutions, enabling the system's available capacity to be fully utilized.
Beyond improving system efficiency, the string-based architecture also offers significant advantages in fault handling. If a single PCS fails, only the capacity of its corresponding battery cluster is affected, and the faulty unit can be isolated within milliseconds. During offline maintenance of the faulty unit, the vast majority of the station's capacity can continue participating in grid dispatch and electricity trading, helping maintain an exceptionally high annual online availability rate.
In addition, powered by JDEnergy's self-developed EMS (Energy Management System), the station has upgraded its maintenance model from “reactive repairs” to “proactive maintenance.” The platform monitors the operating status of every battery cell and every PCS in real time, enabling early fault warnings and rapid issue resolution. This approach not only significantly reduces the frequency of on-site inspections but also effectively minimizes energy losses and revenue losses caused by unplanned downtime.
Rooted in Tongxin County, the project embodies the spirit of being united with customers in purpose. Customers need confidence in operations and greater ease of maintenance. That means improving efficiency, reducing failure rates, and simplifying maintenance.
The Wuzhong Ruichu Technology Quanyan Substation Energy Storage Project demonstrates that string-based energy storage is more than a technology choice—it is the practical implementation of a commitment to maximizing customer value. Looking ahead, JDEnergy will continue to develop more benchmark projects and work hand in hand with customers to deliver reliable momentum for the development of the new power system.
