The Waratah Super Battery, a cornerstone of New South Wales’ energy transition, has achieved full commercial operations, marking a significant milestone for Australia’s grid stability. Announced on 28 September 2026 and widely reported this week, the massive 850 MW / 1,680 MWh battery energy storage system (BESS) is now fully integrated into the National Electricity Market (NEM), capable of powering up to 340,000 NSW households during peak demand.
Built on the site of the former Munmorah coal-fired power station on the NSW Central Coast, the more-than-AUD 1 billion project is designed to act as a crucial ‘shock absorber’ for the grid. Its primary role is to maintain system security during unexpected transmission disruptions, such as those caused by bushfires or severe weather events, as Australia increasingly relies on intermittent renewable energy sources. This capacity is vital as aging coal-fired power stations continue to retire across the state and the broader NEM.
NSW Energy Minister Penny Sharpe confirmed the battery received approval to operate at full capacity from the Australian Energy Market Operator (AEMO). This approval follows extensive commissioning by Akaysha Energy, the developer, and network upgrades delivered by Transgrid, which will also oversee its ongoing performance.
“The Waratah Super Battery is a game changer for NSW. As aging coal-fired power stations retire, this project will help keep the lights on for homes and businesses while enabling more renewable energy to flow through the grid.”
The Waratah Super Battery Project is a critical component of the NSW government’s Electricity Infrastructure Roadmap, designed to facilitate the rapid integration of renewable energy into the state’s network. Its 700 MW System Integrity Protection Scheme (SIPS) control system is a world-first innovation, capable of detecting network issues in real-time and responding instantaneously to ensure continuity of power supply. This advanced capability is essential for managing the grid’s stability as the proportion of variable renewable energy generation increases.
The commissioning of the Waratah Super Battery comes at a time of unprecedented growth in Australia’s battery storage sector. AEMO’s latest data indicates that grid-scale battery capacity in the NEM has surpassed 9,000 megawatts, more than doubling during 2025. Between mid-2025 and mid-2026 alone, approximately 4,640 megawatts and 12,353 megawatt-hours of storage began commissioning, positioning Australia as the world’s third-largest utility battery market.
This rapid expansion is driven by the economics of Australia’s energy market, where high solar penetration during the day can push prices towards zero, allowing batteries to charge cheaply and then discharge into the evening peak when demand and prices are high. This arbitrage strategy is attracting significant investment and is a key factor in stabilising wholesale electricity prices. For households, this large-scale storage indirectly contributes to more reliable and potentially lower energy bills by reducing the reliance on expensive gas-fired power plants. For more on how grid changes affect household costs, see our guide on Navigating Australia’s Energy Bill Relief and Support in 2026: A Comprehensive Guide.
While the Waratah Super Battery significantly boosts grid-scale capacity, home battery storage is also experiencing a boom. The Clean Energy Council reported that 276,011 home batteries were installed in the first half of 2026, a 52% increase from the same period in 2025. This surge is partly attributed to programs like the federal Cheaper Home Batteries Program, which offers a discount of approximately 30% on eligible systems. However, the value of this federal rebate is set to reduce from 1 January 2027, with the Small-scale Technology Certificate (STC) factor falling from 6.8 to 5.7 per usable kilowatt-hour. Households considering a home battery should be aware of this upcoming change; more details can be found in our article: Secure Your $3,500+ Home Battery Rebate: Federal Discount Reduces Jan 1, 2027.
Waratah Super Battery Key Specifications
| Feature | Detail |
|---|---|
| Capacity | 850 MW |
| Energy Storage | 1,680 MWh |
| Location | Munmorah, Central Coast, NSW (former coal site) |
| Cost | Over AUD 1 billion |
| Developer | Akaysha Energy |
| Network Operator | Transgrid |
| Operational Date | Fully operational as of 28 September 2026 |
| Households Powered | Up to 340,000 at peak demand |
The successful deployment of the Waratah Super Battery underscores Australia’s commitment to accelerating its clean energy transition. It demonstrates the tangible progress being made in large-scale energy storage, crucial for supporting the integration of renewables and ensuring a reliable, affordable electricity supply for homes and businesses across NSW. This significant infrastructure project contributes directly to the broader national effort to electrify homes and industries, a topic further explored in Electrify Your Home in 2026: Real Costs, Rebates & Savings Up to $15,000+.