Western Sydney International (WSI) Airport is set to operate entirely on renewable energy from its scheduled opening in late 2026, following a 15-year supply deal confirmed by Australian renewables company CleanPeak Energy on July 7, 2026. The landmark agreement will see a substantial 9MWp rooftop solar PV system integrated with a 30MW/120MWh battery energy storage system (BESS) developed and operated by CleanPeak Energy.
This initiative positions WSI Airport, located at Badgerys Creek approximately 50km west of the Sydney CBD, as a leading example of sustainable aviation infrastructure globally. It underscores a growing trend among major Australian commercial entities to leverage large-scale solar and battery solutions for energy independence and decarbonisation.
Powering a Major International Gateway
The decision to power what will become Australia’s second major international gateway serving Sydney entirely with renewables highlights the increasing viability and strategic importance of integrated solar and battery storage systems for critical infrastructure. The 9MWp rooftop solar array will be one of the largest airport-based solar installations in Australia, directly harnessing the abundant sunshine of Western Sydney.
Complementing the solar generation, the 30MW/120MWh battery energy storage system is crucial for ensuring a consistent and reliable power supply. This significant battery capacity will store excess solar energy generated during peak sunshine hours and discharge it during periods of lower solar output or high demand, such as evenings or cloudy days. This firming capacity is essential for achieving a true 100% renewable energy target for a facility operating 24/7.
“The commitment to 100% renewable energy from day one sets a new benchmark for major infrastructure projects in Australia, demonstrating the tangible benefits of integrating large-scale solar and robust battery storage.”
CleanPeak Energy, as the developer and long-term operator, will be responsible for the design, construction, and ongoing management of the energy infrastructure. The 15-year power purchase agreement (PPA) provides long-term price certainty for the airport, insulating it from volatile wholesale electricity market fluctuations while delivering on ambitious sustainability goals.
The Role of Advanced Energy Storage
The scale of the battery storage system – 30MW of power capacity and 120MWh of energy capacity – is particularly noteworthy. To put this into perspective, a typical residential home battery might offer 10-15 kWh of usable capacity. This airport system represents thousands of residential battery equivalents, designed to manage the substantial and dynamic energy demands of an international airport. Such systems are vital for maintaining grid stability and ensuring uninterrupted operations, a critical consideration for aviation. Homeowners looking to understand how battery backup works on a smaller scale can refer to guides like Home Battery Backup for Blackouts in 2026: Systems & Costs from $7,000.
The integration of such a large-scale BESS also demonstrates the evolution of renewable energy solutions beyond simple generation. It showcases the ability of modern energy systems to provide reliable, dispatchable power, addressing the intermittency challenges traditionally associated with solar PV. This approach aligns with broader national efforts to strengthen grid resilience and incorporate more renewable assets, as seen with other significant projects across the National Electricity Market (NEM).
Broader Implications for Australian Energy
This project contributes directly to New South Wales’ ambitious renewable energy targets and Australia’s overall decarbonisation efforts. By securing a 100% renewable energy supply for a facility of this magnitude, WSI Airport will significantly reduce its operational carbon footprint. It also serves as a strong signal to other commercial and industrial sectors that substantial investments in renewable energy and storage are not only environmentally responsible but also economically sound for long-term operations.
The trend of large-scale commercial and industrial solar installations, often paired with battery storage, is accelerating across Australia. Businesses are increasingly recognising the financial benefits of self-generation and storage, including reduced electricity bills, hedging against future price increases, and enhanced corporate social responsibility. Understanding the optimal solar system size for various applications is key to maximising these benefits. For residential applications, a guide like What Solar System Size Do You Really Need in Australia 2026? Future-Proofing for EVs & Electrification provides valuable insights into sizing considerations.
The Western Sydney International Airport project, with its substantial 9MW solar array and 120MWh battery, represents a tangible step towards a more sustainable and energy-independent future for Australian infrastructure. Its operationalisation in late 2026 will provide a real-world case study for other large-scale developments considering similar renewable energy transitions.