Sydney, NSW — Origin Energy has referred plans for a monumental 4,942 megawatt-hour (MWh) expansion of its Eraring battery energy storage system (BESS) for federal environmental assessment, a move set to significantly bolster New South Wales’ energy grid. The proposed Eraring BESS North project, announced on 6 October 2026, aims to establish what Origin describes as the Southern Hemisphere’s largest battery storage complex once fully integrated with existing stages.
The expansion comes as Australia’s National Electricity Market (NEM) undergoes a rapid transition away from coal-fired generation towards variable renewable energy sources. This shift necessitates substantial dispatchable firming capacity, a role large-scale batteries are increasingly filling to maintain grid stability and reliability.
Origin’s Ambitious Scale for Eraring
The Eraring BESS North project proposes adding 500 megawatts (MW) and approximately 4,942 MWh of storage capacity adjacent to Origin’s existing Eraring Power Station site on the NSW Central Coast. This ambitious addition would see the entire Eraring battery precinct grow to approximately 1.2 gigawatts (GW) of power capacity and 8.6 gigawatt-hours (GWh) of energy storage, establishing it as a critical asset for the state’s energy future.
“The development of large-scale BESS projects is critical to the ongoing transition to renewable energy,” Origin stated in its federal Environment Protection and Biodiversity Conservation (EPBC) Act referral. “The NSW Electricity Infrastructure Roadmap targets at least 12 GW of renewable generation and 2 GW of long-duration storage by 2030, creating a firming gap that this project will help address.”
The existing Eraring BESS has been delivered in stages. The first stage, a 460MW/1,770MWh system, commenced commercial operations in January 2026. A second stage, adding 240MW/1,030MWh, was approved in July 2024 and is equipped with grid-forming inverters, targeting commercial operation in early 2027. A third stage, contracted in December 2024, is set to add a further 700MWh and convert the first stage from a two-hour to a four-hour duration system.
Addressing NSW’s Energy Needs
The substantial increase in battery storage capacity at Eraring is designed to respond directly to the anticipated firming requirements of the NEM. As coal-fired power stations retire, including Origin’s own Eraring plant by 2025, large-scale battery systems become essential for storing excess renewable energy generated during daylight hours and dispatching it during evening peaks or periods of low renewable output. This capability is vital for ensuring a consistent and reliable power supply for NSW households and businesses. The project is expected to operate for up to 25 years once commissioned.
Construction for the Eraring BESS North project is anticipated to commence in 2028, with commercial operations targeted for early to mid-2031, subject to receiving all necessary regulatory approvals. The proposed project footprint covers up to 22 hectares, with roughly half located within the existing Eraring BESS project boundary on previously disturbed land.
The strategic location and scale of this expansion underscore the urgent need for long-duration energy storage as NSW progresses towards its renewable energy targets. Projects of this magnitude are crucial for enabling greater integration of solar and wind power, ultimately contributing to lower overall energy costs and enhanced grid resilience.
Consumers stand to benefit indirectly from such infrastructure developments through increased grid stability and reduced wholesale electricity price volatility, which can influence retail power bills. For more information on how government initiatives and market changes impact household finances, refer to our guide on Navigating Australia’s Energy Bill Relief and Support in 2026: A Comprehensive Guide.
This development follows a period of significant growth in Australia’s grid-scale battery sector. The NEM’s 59 grid-scale battery energy storage systems collectively earned AU$88.91 million in estimated gross energy and Frequency Control Ancillary Services (FCAS) market revenue during the third quarter of 2026, marking a 57% increase from the second quarter. As more projects like Eraring BESS North come online, this contribution to market stability and revenue generation is expected to continue growing.
Future Outlook for Battery Storage in Australia
The Australian Energy Market Operator’s (AEMO) 2026 Integrated System Plan (ISP) forecasts a significant increase in storage requirements, with almost 40 GW of storage targeted by 2050. This includes 35 GW of short and medium-duration storage for daily firming and 5 GW of long-duration storage for seasonal reliability. Origin’s Eraring BESS expansion aligns directly with this long-term vision, providing critical long-duration capacity.
The scale of projects being referred for assessment, such as TagEnergy’s 1 GW/4 GWh Morwell BESS project in Victoria, also highlight the accelerating pace of utility-scale battery development across the country. These large-scale systems are foundational to supporting a grid increasingly powered by renewables, ensuring that Australia can meet its energy demands reliably and sustainably.
While this announcement focuses on grid-scale infrastructure, the broader battery market continues to evolve. For households considering their own energy independence, understanding available incentives remains important. Explore options to reduce your upfront costs with our guide to Your 2026 Guide: Claim Up To $15,000 in Energy Rebates Across Australia.
Origin Energy’s commitment to expanding its Eraring BESS underscores the strategic importance of large-scale battery storage in Australia’s energy transition, paving the way for a more resilient and renewable-powered future for NSW. The project’s progression will be closely watched as it moves through the federal environmental approval process.