Expanding the Mega-Hub: Bungaban Wind Project Seeks Green Light for Massive Solar and Battery Addition

Australia’s renewable energy landscape is shifting from standalone generation assets to deeply integrated, multi-technology mega-hubs.

The developers behind the mammoth 1.4 Gigawatt (GW) Bungaban Wind Project in Queensland's Western Downs have officially submitted plans to the federal government to expand the site’s footprint. According to documentation filed under the Environment Protection and Biodiversity Conservation (EPBC) Act, the project is seeking approval to construct an additional 500 Megawatt (MW) solar farm paired with a 500 MW Battery Energy Storage System (BESS).

Jointly owned by Andrew Forrest’s Squadron Energy and Federation Asset Management (the full owner of Windlab), the Bungaban development is set to become one of the most critical dispatchable clean energy hubs on the National Electricity Market (NEM).

Here is a breakdown of the proposed expansion, its role in decarbonizing heavy industry, and the immense operational logistics required to manage projects of this scale.

⚡ The Integrated Bungaban Hub: Wind, Solar, and Storage

Located approximately 50 kilometers northeast of Wandoan in Queensland, the Bungaban project was originally conceived as a massive 1.4 GW wind farm featuring up to 204 turbines.

By applying to add 500 MW of solar PV and 500 MW of deep battery storage, the developers are capitalizing on the "inverse correlation" of the region's weather patterns—where strong wind generation at night seamlessly complements peak solar generation during the day. The integrated BESS (likely to feature a 4-hour duration of ~2,000 MWh) will firm this generation, ensuring clean energy can be dispatched exactly when the grid demands it.

Project Expansion Highlights

Component	Specifications / Details	Strategic Value
Wind Generation	1.4 GW (Up to 204 Turbines)	Nighttime and seasonal baseload generation.
Solar Generation	500 MW PV Array	Peak daytime generation capitalizing on the region's high solar irradiance.
Battery Storage	500 MW BESS	Deep storage to firm intermittent output and stabilize evening wholesale prices.
Agrivoltaics	Livestock Co-location	The 1,531-hectare site will continue to support cattle grazing directly under turbines and alongside solar panels.

🏭 Rio Tinto and the Heavy Industry Transition

The sheer scale of the Bungaban project is underpinned by the urgent need to decarbonize Australia’s heavy manufacturing and minerals sector.

In early 2024, the developers signed a landmark Power Purchase Agreement (PPA) with global mining giant Rio Tinto, committing 80% of the wind farm’s output over 25 years. This massive off-take agreement is strategically designed to power Rio Tinto’s Boyne Island aluminium smelter, serving as a direct replacement for the Gladstone coal-fired power station, which is scheduled to close in 2029.

The remaining 20% of the hub's generation will feed directly into the NEM, providing clean, low-cost power to homes and commercial businesses across Queensland.

🛑 Navigating the EPBC and Grid Connections

Transforming a $3.9 billion concept into physical infrastructure requires navigating complex environmental and regulatory hurdles.

The addition of the solar and battery components is currently undergoing strict environmental scrutiny under the federal EPBC Act, ensuring the protection of biodiversity and local habitats. Simultaneously, state-owned network operator Powerlink is managing the complex transmission logistics, developing the dedicated Warranna substation to securely integrate Bungaban's massive output into the broader Queensland grid.

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