Sungrow announced on September 30, 2026, that the Cambodia EDC Kandal Stueng station (GS79) battery energy storage project in Takmao, Kandal Province, has completed grid connection and full acceptance testing. The utility-scale system has a rated power of 108.4 MW and an energy capacity of 215.6 MWh.
Sungrow Connects 108.4 MW Battery System in Cambodia
Sungrow’s GS79 reached grid connection and full acceptance, adding grid-forming black-start and restoration capability to Cambodia’s central power grid.
The toughest proof point: stability through five transformer energization events, including 100 MVA, and synchronization at up to 15 degrees.
The project uses 516 grid-forming power conversion system (PCS) units to establish voltage and frequency without support from an operating grid. In tests, the units energized the entire plant from zero voltage and supported restoration of approximately 240 km of transmission lines and five substations. Sungrow said the installation is intended to support voltage and frequency stability at a key point in Cambodia’s central power grid, including corridors used to import electricity from Vietnam.
During system-restoration trials, the BESS supported the startup and synchronization of the 60 MW Kamchay Hydropower Plant. The restored network was then operated with the 135 MW CIIDG coal-fired power plant, the storage system and electrical loads. The system also remained stable through five transformer energization events, including a transformer rated at up to 100 MVA, and synchronized power sources with phase-angle differences of up to 15 degrees.
The battery system operated independently from the main grid for 3.5 hours. It also completed three transitions between grid-connected and islanded operation. During grid separation, voltage deviation remained below 2%, while transient frequency fluctuation stayed within 0.15 Hz, according to Sungrow.
Sungrow said the project faced strict test protocols, complex power-system scenarios, a compressed construction schedule, rainy-season conditions and ambient temperatures of up to 40°C. Hot commissioning and three rounds of performance tests were completed within 20 days. The company is also providing integrated storage and monitoring design, commissioning, operations and maintenance services, and support related to engineering, procurement and construction.
Source: PR Newswire
