Wärtsilä will deliver the fourth stage of the Eraring battery facility at Origin Energy's 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 Eraring battery's total capacity to 700 MW / 3,160 MWh.

The project represents the largest battery project in Australia and one of the largest in the world. The order was booked in Q4 2025, with the Stage 4 extension commencing in December 2025 and expected to be completed by early 2027.

Project Expansion and Global Significance

The fourth-stage expansion will provide additional 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). It 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.

Origin Energy 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 as one of the world's largest battery energy storage systems.

Technology and System Management

Stage 4 will utilize 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.

As energy storage systems scale to the GWh level, the number of data points to be managed grows exponentially. Wärtsilä's market-leading GEMS Digital Energy Platform is designed to manage a complex project like Eraring, optimizing performance, reliability, and value.

Company Portfolio and Market Position

With Stage 4 underway, Wärtsilä's energy storage portfolio in Australia now exceeds 5.8GWh. Tamara de Gruyter, President of Wärtsilä Energy Storage and EVP of Wärtsilä, stated that "This extension marks another important milestone in Wärtsilä's path towards enabling a secure, renewable energy future in Australia and around the world. 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."

Wärtsilä Energy Storage has a global footprint across over 130 sites and is trusted by top-tier utilities, developers, and system operators. The company's portfolio includes high-performance hardware, intelligent controls and optimization software, and full-service lifecycle support to deliver lasting value across the project lifespan.

Wärtsilä is a global leader in innovative technologies and lifecycle solutions for the marine and energy markets, with a dedicated team of 18,300 professionals in more than 230 locations in 77 countries.

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