Technology group Wärtsilä will deliver the fourth stage of the Eraring battery facility at Origin Energy's (Origin) Eraring Power Station in New South Wales, Australia. The expansion adds 360 megawatt hours (MWh) of new energy storage capacity to the project, bringing the total capacity of the Eraring battery to 700 MW / 3,160 MWh. The project is the largest battery project in Australia and one of the largest in the world, continuing Wärtsilä and Origin’s leadership in pushing the boundaries of energy storage to enable a 100% renewable energy future. The order was booked in Q4 2025.
Credit: Origin Energy
Wärtsilä will deliver the fourth stage of Origin’s Eraring battery energy storage system.
With this extension, the project will provide increased capacity to help balance the grid as renewable generation grows and coal-fired plants retire. The Eraring battery connects to Australia’s National Electricity Market (NEM) and provides critical grid services, including frequency control, firming capacity, and system strength support, that enhance system security and reliability as variable renewable energy supply increases.
As energy storage systems increase to the GWh scale, the number of data points needed to be managed grows exponentially. Wärtsilä’s market-leading GEMS Digital Energy Platform is designed to manage a complex project like Eraring, optimising performance, reliability, and value. Stage 4 will utilise Wärtsilä’s fully integrated, modular, and compact Quantum energy storage system. The project is supported by a multi-term service agreement, ensuring long-term reliability and optimal system efficiency.
“This extension marks another important milestone in Wärtsilä's path towards enabling a secure, renewable energy future in Australia and around the world,” says Tamara de Gruyter, President, Wärtsilä Energy Storage and EVP, Wärtsilä. “Alongside Origin, we are setting a new global benchmark for large-scale energy storage with one of the largest and most advanced battery energy storage facilities in the world.”
Origin selected Wärtsilä for Stage 1 of the project in 2023, and for Stages 2 and 3 in 2024. Together, these stages have established Eraring as a cornerstone project in Australia’s clean energy transition and one of the world’s largest battery energy storage facilities.
The Stage 4 extension will commence in December 2025 and is expected to be completed by early 2027. With Stage 4 underway, Wärtsilä’s energy storage portfolio in Australia now exceeds 5.8GWh.