Sydney, NSW — The Australian Energy Regulator (AER) has greenlit a significant modification to the contract governing the Waratah Super Battery, Australia’s most powerful grid-scale energy storage system. Announced on October 10, 2026, this regulatory change will allow the 850 MW / 1,680 MWh battery to participate more actively in the National Electricity Market (NEM) from late 2026, promising enhanced grid flexibility and potential cost savings for New South Wales electricity consumers.
The decision by the AER frees the Waratah Super Battery from most of its initial “shock absorber” obligations under the System Integrity Protection Scheme (SIPS) contract. This original arrangement required the battery to reserve a substantial portion of its capacity – 700 MW and 1,400 MWh – daily between 5 AM and sunset, effectively putting it on standby to prevent grid instability during unexpected events.
However, with the delayed closure of the Eraring coal-fired power station now pushed back to April 2029, the Waratah battery’s original SIPS role has become largely redundant. The AER’s approval means the battery will now only need to provide this contingency capacity “when needed” and with at least 24 hours’ notice. This liberates its substantial storage and power capabilities to be traded in the wholesale market for the majority of the time, enabling it to earn additional revenue and potentially reduce the overall cost of the landmark contract.
“Australia’s most powerful battery has been set free from most of its unique ‘shock absorber’ obligations, to allow it to trade freely on the electricity market, earn extra money and potentially slash the cost of the landmark but now largely redundant contract.”
A Path to Full Market Participation
Developed and operated by Akaysha Energy, the Waratah Super Battery, located on the site of the former Munmorah coal-fired power station near Budgewoi, NSW, achieved its final commercial operations on September 28, 2026. This followed an 18-month delay, largely due to a catastrophic failure of a high-voltage transformer shortly after its initial discharge in October 2025, which limited its output to 350 MW for an extended period. The second transformer was returned to service in June 2026, restoring the system’s full 700 MW contracted capacity and 1,680 MWh of storage.
The battery’s full operational status, combined with the AER’s latest ruling, marks a pivotal moment for NSW’s energy transition. The ability for a major asset like the Waratah Super Battery to respond dynamically to market signals will be crucial for integrating increasing amounts of intermittent renewable energy into the grid. This flexibility allows the battery to charge when solar and wind generation are abundant and prices are low, and discharge during peak demand periods, helping to stabilise prices and supply.
Broader Implications for the NEM
The Waratah Super Battery’s enhanced market participation could set a precedent for other large-scale battery energy storage systems (BESS) across the NEM. As more coal-fired power stations retire, grid-scale batteries are essential for maintaining system strength and reliability. The financial viability of these projects is often tied to their ability to provide both network support services and participate in energy arbitrage, where they profit from buying and selling electricity at different times.
This development comes amidst a period of rapid growth in Australia’s battery sector. Recent data from the Clean Energy Council (CEC) highlighted a surge in home battery installations during the first half of 2026, significantly outpacing previous forecasts. While the Waratah Super Battery operates at a utility scale, the underlying principle of leveraging battery storage for grid stability and economic benefit remains consistent across residential and large-scale applications.
For households considering their own energy storage solutions, federal incentives like the Cheaper Home Batteries Program continue to play a role in making batteries more accessible, though the rebate structure is subject to change. Understanding how grid-scale assets like the Waratah Super Battery contribute to overall system stability underscores the broader impact of battery technology on Australia’s energy future.
While the exact financial uplift for the Waratah Super Battery from this new arrangement is yet to be fully quantified, the transition to a more flexible operational model is expected to provide significant commercial advantages for Akaysha Energy and deliver greater value to the NSW electricity market. This move underscores the evolving role of battery storage, moving beyond purely contingency services to become active, revenue-generating participants in the Australian energy landscape.
Key Waratah Super Battery Details
| Feature | Specification |
|---|---|
| Capacity | 850 MW |
| Energy Storage | 1,680 MWh |
| Location | Munmorah, NSW (former coal power station site) |
| Operator | Akaysha Energy |
| Original Purpose | System Integrity Protection Scheme (SIPS) “shock absorber” |
| New Operation | Flexible market trading, contingent SIPS support |
| AER Approval Date | October 10, 2026 |
| Market Start | Late 2026 |
This regulatory shift represents a maturation of Australia’s energy market, adapting to the capabilities of modern battery technology and ensuring that critical infrastructure can deliver maximum value. As the NEM continues its rapid transformation, the flexible deployment of assets like the Waratah Super Battery will be vital for a secure and affordable energy supply.
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