Sineng Electric powers 300 MW storage project to manage renewable curtailment in Gansu

A 300 MW / 1,200 MWh standalone battery energy storage project equipped with Sineng Electric's central PCS has entered commercial operation in Zhangye City, Gansu Province. The four-hour long-duration system is expected to reduce curtailed wind and solar generation by over 79 million kWh annually while providing grid ancillary services.

A 300 MW / 1,200 MWh standalone energy storage project powered by Sineng Electric has commenced commercial operation in Zhangye City, Gansu Province, a region rich in wind and solar resources, according to an official announcement. The four-hour long-duration energy storage system can store up to 1.2 million kWh of renewable electricity per charge-discharge cycle and is expected to reduce curtailed wind and solar generation by more than 79 million kWh annually, enhancing renewable energy utilisation and grid absorption capacity.

Sineng Electric is a Chinese power electronics company specialising in energy storage and solar inverter solutions. The project is equipped with the company's 1,250 kW central power conversion system, which delivers a peak efficiency of 99% and an IP65 protection rating for harsh Gobi Desert conditions. The PCS reduces parallel battery clusters by 50%, increasing system charge and discharge capacity by 0.75%.

This development matters for China's renewable energy integration, where structural challenges including intermittency, grid congestion, and limited transmission capacity have historically led to curtailment of wind and solar generation. Persistent imbalances between daytime photovoltaic surplus and evening peak demand are addressed through temporal energy shifting and enhanced grid flexibility.

For the energy storage industry, the project demonstrates the role of utility-scale storage in peak shaving, load shifting, frequency regulation, and renewable output smoothing. Stakeholders including grid operators, renewable project developers, and ancillary service markets stand to benefit from the millisecond-level dynamic response capability that supports grid stability. The project underscores the strategic role of long-duration storage in modern power systems as decarbonisation accelerates.