Hold point testing is now underway at the Eraring BESS (Battery Energy Storage System), marking a critical step before the first stage begins full operation.
The testing process involves gradually increasing the system’s power output under real-world conditions to confirm functional performance across all systems. It is one of the final commissioning phases before the BESS can provide energy to the grid at full capacity.
Once operational, the Eraring BESS will help stabilise the National Electricity Market (NEM) by storing excess renewable energy generated during low-demand periods and discharging during peak times. The project is designed to support grid reliability as more variable renewable sources enter the system.
Located adjacent to Origin Energy’s Eraring Power Station in New South Wales, the BESS leverages existing transmission infrastructure to minimise the need for new grid connections.
All three stages of the battery are under construction. Stage one and stage three – each rated at 460 megawatts (MW) with four-hour dispatch duration – are scheduled to be operational by Q4 2025. Stage two, adding a further 240 MW with the same dispatch duration, is due online in Q1 2027. Once complete, the system will deliver a combined energy storage capacity of 2.8 gigawatt-hours (GWh).
Site works are progressing, with civil and electrical infrastructure nearing completion. Current activities include battery module installation, underground electrical services, and commissioning of switch and control rooms. The TransGrid substation has been energised, and hot and cold commissioning of the first battery zone is now underway.
In February, regulatory approval was granted to extend work hours on weekends through to 31 August 2025, allowing for continuous progress on commissioning activities, including inverters and secondary equipment.