The National Electricity Market (NEM) has received a significant boost with Akaysha Energy’s 415 megawatt (MW) / 1,660 megawatt-hour (MWh) Orana Battery Energy Storage System (BESS) reaching full operational output in New South Wales. The facility, located near Wellington in the Central-West Orana Renewable Energy Zone (REZ), achieved its full power on May 29, 2026, marking a critical milestone for grid stability and the integration of renewable energy across Australia’s eastern states.
The Orana BESS, now recognised as Australia’s third-largest grid-scale battery in terms of energy capacity, is equipped with 448 Tesla Megapacks. Its four-hour storage duration enables it to deliver substantial power during peak demand periods, effectively smoothing out the variability inherent in renewable energy sources like solar and wind. This capacity is crucial as Australia continues its transition away from coal-fired power generation. The project connects directly into Transgrid’s 330 kilovolt (kV) network, strategically minimising the need for extensive new transmission infrastructure.
“The full operation of the Orana BESS is a testament to the rapid advancement of grid-scale battery technology in Australia,” stated an energy market analyst for Daily Energy News. “This facility is not just about storing energy; it’s about providing essential grid services, enhancing reliability, and accelerating our transition to a cleaner energy future.”
Financial Investment and Strategic Importance
The Orana BESS represents a substantial investment in Australia’s energy future, backed by approximately AUD$650 million in debt financing from a syndicate of 11 banks, including major Australian institutions such as ANZ, Commonwealth Bank, and Westpac. EnergyAustralia has secured 200 MW of the battery’s capacity through a 12-year virtual tolling agreement, providing a stable revenue stream for the project while allowing the remaining capacity to participate in the volatile electricity spot markets.
This strategic location within the Central-West Orana REZ is key. The NSW government has committed to developing five REZs, with the Central-West Orana being the first. These zones are designed to concentrate new renewable energy generation and storage, supported by upgraded transmission infrastructure, to efficiently deliver clean power to the grid. The Orana BESS will play a vital role in unlocking the full potential of this REZ, which has an intended network capacity of six gigawatts by 2038.
“The Orana BESS reaching full output reinforces the critical role of large-scale battery storage in managing the complexities of a rapidly evolving energy landscape. It provides both dispatchable power and crucial system services, directly benefiting NSW electricity consumers.”
Impact on Grid Stability and Renewable Integration
Grid-scale batteries like the Orana BESS are instrumental in addressing system strength and frequency control issues that arise with increasing levels of intermittent renewable generation. By rapidly injecting or absorbing power, these batteries can respond to grid disturbances in milliseconds, helping to maintain the stability and reliability of the NEM. This is particularly important during periods of high demand or when traditional synchronous generators retire.
The project’s commissioning contributes to Australia’s growing reputation as a global leader in utility-scale battery deployment. The Clean Energy Council’s Clean Energy Australia 2026 report highlighted that Australia added a record 2 gigawatts of big-battery capacity in 2025 alone, a 233% increase over the previous year. This rapid expansion underscores the nation’s commitment to building a robust and resilient clean energy grid.
Comparing Australia’s Largest Grid Batteries (Operational Capacity)
To put the Orana BESS’s capacity into perspective, here’s a comparison of Australia’s largest operational grid-scale batteries by energy capacity (MWh) as of early June 2026:
| Battery Name | State | Developer | Power (MW) | Energy (MWh) | Operational Date (Full Output) |
|---|---|---|---|---|---|
| Victorian Big Battery | VIC | Neoen | 300 | 450 | December 2021 |
| Hornsdale Power Reserve | SA | Neoen | 150 | 194 | December 2017 (initial) |
| Orana BESS | NSW | Akaysha Energy | 415 | 1,660 | May 29, 2026 |
| Waratah Super Battery | NSW | Akaysha Energy | 700 (850 target) | 1,680 | June 4, 2026 (700MW) |
| Limondale BESS | NSW | RWE | 50 | 400 | June 1, 2026 |
Note: The Waratah Super Battery is targeting full 850 MW capacity by the end of 2026, with 700 MW currently operational. The Orana BESS’s 1,660 MWh capacity positions it as a dominant player in the NEM.
As more large-scale batteries come online, the dynamics of the NEM are shifting. This allows for greater integration of renewable generation and provides opportunities for consumers to benefit from a more stable and potentially more affordable electricity supply. Households and businesses looking to optimise their energy usage can explore options such as Best Electricity Plans in Australia 2026: A Comprehensive Guide for Households to Cut Costs and consider the role of local solutions, including home batteries, in supporting the broader grid through programs like those outlined in Unlock $1,000+ Annually: Best Home Battery VPP Programs in Australia 2026 Ranked.
The successful commissioning of projects like the Orana BESS underscores the rapid pace of Australia’s energy transition, with grid infrastructure evolving to support a future powered predominantly by clean energy. The focus now shifts to ensuring that these new assets are fully integrated to deliver maximum benefits for all NEM participants and consumers. The Australian Energy Market Operator (AEMO) continues to work closely with developers and network service providers to manage this complex transition and ensure the reliability of the national grid.
Future Outlook for Grid-Scale Storage
The pipeline for new battery storage projects across Australia remains robust. As of the first quarter of 2026, AEMO reported 67.3 gigawatts of generation and storage moving through the grid-connection process, with batteries accounting for nearly half of this capacity. This sustained investment in grid-scale batteries will be essential for meeting Victoria’s ambitious renewable energy targets and supporting similar goals in other states. The Morwell BESS, a proposed 1 GW / 4 GWh battery in Victoria, which recently received development approval, is another example of the significant projects on the horizon.
These large-scale deployments are complemented by ongoing network enhancements and strategic planning by bodies like VicGrid and EnergyCo NSW, who are actively shaping the future of transmission infrastructure to support the declared Renewable Energy Zones. The combination of massive battery storage and upgraded transmission will be critical for maintaining frequency control and system strength across the interconnected NEM, ensuring a secure and reliable energy supply for Australian homes and businesses well into the future.