Wärtsilä will deliver the fourth stage of the Eraring battery energy storage facility at Origin Energy’s Eraring Power Station in New South Wales, Australia. The expansion adds 360 MWh, bringing total capacity to 700 MW / 3,160 MWh.
The project is the largest battery facility in Australia and one of the largest globally. It strengthens Wärtsilä and Origin’s leadership in large-scale energy storage and supports a 100% renewable energy future. The order was booked in Q4 2025.
Stage 4 will boost grid stability as renewable generation grows and coal plants retire. Connected to Australia’s National Electricity Market (NEM), the battery provides frequency control, firming capacity, and system strength support.
Wärtsilä’s GEMS Digital Energy Platform manages the large-scale project, optimizing performance, reliability, and value. Stage 4 will use the modular Quantum energy storage system and is backed by a long-term service agreement for optimal efficiency.
“This extension is a milestone in enabling a secure, renewable energy future,” said Tamara de Gruyter, President, Wärtsilä Energy Storage. “We are setting a new global benchmark with one of the world’s largest battery storage facilities.”
Origin chose Wärtsilä for Stages 1–3 between 2023 and 2024. Stage 4 begins December 2025 and is expected to complete by early 2027. With this expansion, Wärtsilä’s energy storage portfolio in Australia now exceeds 5.8 GWh.
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