RWE has received regulatory approval to move Australia's first eight-hour battery energy storage system from commissioning to full commercial operations, marking what the company describes as a significant milestone in the country's long-duration storage ambitions.

The Limondale Battery Energy Storage System, located near Balranald in southern New South Wales, has been cleared by both the Australian Energy Market Operator and transmission network service provider Transgrid to operate at maximum capacity.

A Record-Setting System in the Australian Market

The Limondale BESS comprises 144 Tesla Megapacks and is registered to charge at 100 megawatts and discharge at 50 megawatts, with the ability to sustain that maximum discharge output for more than eight hours.

The system carries a total storage capacity of at least 400 megawatt hours, making it the longest-duration battery currently operating anywhere in Australia. No other battery system in the country has achieved equivalent duration at this point in time, according to the company.

The facility sits adjacent to RWE's existing Limondale Solar Farm, a 314 megawatt alternating current installation that was commissioned in 2021 and consists of 872,000 panels capable of generating enough electricity to power approximately 105,000 homes per year. The pairing of the solar farm and the new battery system positions the site as a combined generation and storage asset within the New South Wales grid.

Compliance Testing and Grid Integration

Before receiving the green light for full operations, the Limondale BESS underwent a series of grid compliance and performance tests following its commissioning phase.

These tests were designed to demonstrate the plant's ability to safely operate at maximum capacity and to confirm that the system meets the technical requirements set by AEMO and Transgrid. The battery has now passed those evaluations and has been formally cleared for full commercial dispatch.

RWE said the battery is intended to reduce network pressures during peak demand periods, supporting what it characterized as a more flexible and secure electricity system.

The system's extended discharge duration is central to this function, allowing it to deliver sustained output during periods when renewable generation may be limited or demand is elevated.

Policy Origins and the New South Wales Roadmap

The Limondale BESS was sized at eight hours specifically in response to the New South Wales Government's Electricity Infrastructure Roadmap, a policy framework directing the state's energy transition.

The project was the first to receive a Long Duration Storage Long-Term Energy Service Agreement, an instrument awarded through a tender process conducted by the Australian Energy Market Operator's subsidiary, ASL.

That agreement was designed to underwrite early investment in long-duration storage projects and to signal the state's commitment to integrating renewable energy sources into the grid at scale.

The LTESA award placed the Limondale project at the front of a nascent long-duration storage pipeline in New South Wales, with the project now having fulfilled the operational milestones that the agreement was structured to support.

Project Partners and Delivery

RWE worked with several industry partners to deliver the Limondale BESS. In addition to Tesla, which supplied the Megapack units at the core of the system, the project involved Beon Energy Solutions, Lumea, and Transgrid. T

he collaboration extended to the New South Wales government and AEMO, whose involvement was required both for the policy framework underpinning the project and for the technical approvals necessary to bring it into operation.

Sopna Sury, Chief Executive Officer of RWE Renewables Europe and Australia, said the project transforms battery storage in Australia and enhances the reliability and resilience of the national energy system. Sury credited the RWE team, project partners, the New South Wales government, and AEMO for their collaboration in delivering the system.

RWE's Broader Australian and Global Storage Position

RWE has operated in Australia since 2013 and has been building out a portfolio that spans wind, solar, and battery storage projects across the country. Beyond the now-operational Limondale assets, the company has received development approval for its Theodore Wind Farm in Queensland, which has a planned capacity of around one gigawatt and is currently working through the federal Environment Protection and Biodiversity Conservation process.

Globally, RWE currently operates battery storage systems with a combined capacity of 1.7 gigawatts, with a further approximately 2.5 gigawatts under construction.

The company has identified battery storage expansion as an integral part of its broader growth strategy across its operating regions, which include the United States, Europe, and Australia.

The full operationalization of the Limondale BESS represents the first delivery of a long-duration storage project under the New South Wales Electricity Infrastructure Roadmap's dedicated support mechanism and adds a new benchmark for storage duration to the Australian National Electricity Market.

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