Octopus Australia Acquires 4.8GWh Hanworth Battery Storage Project and Queensland Solar‑battery Asset

Why It Matters

With 75% of Australia’s coal capacity slated for retirement within a decade, large‑scale storage is essential for grid reliability and a clean‑energy transition, making Octopus’s acquisitions a pivotal step toward a resilient, low‑carbon power system.

Key Takeaways

• 1.2 GW/4.8 GWh Hanworth BESS becomes Australia's largest planned battery
• Project will supply over 500,000 homes during peak evenings
• Acquisition expands Octopus's renewable portfolio across NSW and Queensland
• Supports replacement of retiring coal plants with firm, low‑emission power
• Institutional investors back project, signaling confidence in large‑scale storage

Pulse Analysis

Australia’s power landscape is at a tipping point as coal‑fired generators near the end of their economic life. The International Energy Agency warns that flexible, fast‑responding assets will be required to balance the surge of variable renewables. Octopus Australia’s purchase of the Hanworth battery directly addresses this gap, offering 4.8 GWh of dispatchable energy that can be called upon during evening peaks, a period traditionally dominated by fossil‑fuel generation. By tying the storage to Transgrid’s Bannaby Terminal, the project integrates seamlessly into the National Electricity Market, providing a reliable bridge for large‑scale renewable contracts.

The technical scale of Hanworth sets a new benchmark for the nation. At 1.2 GW of power capacity, it eclipses the 760 MW Eraring BESS and the 850 MW Waratah Super Battery, while its 4.8 GWh energy rating translates to enough electricity to run over 500,000 households for several hours. This depth of storage enables time‑shifting of solar and wind output, smoothing intermittency and reducing reliance on expensive peaking generators. Moreover, the simultaneous acquisition of the Dunmore solar‑plus‑storage hybrid in Queensland demonstrates Octopus’s commitment to diversified, geographically dispersed assets that can balance supply across multiple regions.

Strategically, Octopus’s 100 % ownership model gives it full operational control, allowing the firm to lock in stable pricing for corporate off‑takers and hedge against wholesale market volatility. The backing of institutional investors such as the Clean Energy Finance Corporation, APG, Rest and Hostplus underscores confidence in the financial viability of large‑scale battery projects. As Australia phases out coal, the combined solar‑battery portfolio positions Octopus as a key player in delivering low‑carbon, firm power, while setting a template for future renewable‑plus‑storage developments across the Asia‑Pacific region.

Deal Summary

Octopus Australia announced the acquisition of the 1.2 GW/4.8 GWh Hanworth Battery Energy Storage System from Enervist, marking the largest planned BESS in Australia. The company also bought the Dunmore Solar Farm and Battery project in Queensland from Samsung C&T Renewable Energy Australia.