Wärtsilä, a leading technology company, is set to deliver the fourth stage of the Eraring battery facility at Origin Energy’s Eraring Power Station in New South Wales, Australia. This expansion will add 360 megawatt hours (MWh) of new energy storage capacity, increasing the total capacity of the Eraring battery to 700 MW / 3,160 MWh. As the largest battery project in Australia and one of the largest globally, it exemplifies Wärtsilä and Origin’s commitment to advancing energy storage and facilitating a 100% renewable energy future. The order was secured in Q4 2025.
The extension will bolster the grid’s capacity to balance increasing renewable generation as coal-fired plants are phased out. The Eraring battery is connected to Australia’s National Electricity Market (NEM) and provides essential services such as frequency control, firming capacity, and system strength support, thereby enhancing system security and reliability as the share of variable renewable energy grows.
Managing energy storage systems at the gigawatt-hour scale presents a complex challenge, with data points increasing exponentially. Wärtsilä’s GEMS Digital Energy Platform is purpose-built to manage such complexity, optimising performance, reliability, and value. Stage 4 will employ Wärtsilä’s integrated, modular, and compact Quantum energy storage system, supported by a multi-term service agreement to ensure long-term efficiency and reliability.
“This extension marks another important milestone in Wärtsilä’s path towards enabling a secure, renewable energy future in Australia and around the world,” stated Tamara de Gruyter, President of 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 initially selected Wärtsilä for Stage 1 of the project in 2023, followed by Stages 2 and 3 in 2024. These stages have positioned Eraring as a pivotal project in Australia’s transition to clean energy, establishing it as one of the world’s largest battery energy storage facilities.
The Stage 4 expansion is scheduled to commence in December 2025, with completion expected by early 2027. With this development, Wärtsilä’s energy storage portfolio in Australia will surpass 5.8 GWh, reinforcing its leadership in the region’s renewable energy landscape.
