Large-scale storage is expected to grow exponentially in the coming decades. Coupling storage with renewable energy projects is an essential part of Australia’s transition from an electricity system dominated by large, centralised synchronous thermal generators to a more distributed generation fleet with a growing proportion of variable renewable energy sources. Currently, the number of projects announced dwarf’s storage assets in operation and under construction. As seen in Figure 1, the market for storage has been buoyant in recent times. This is especially apparent following the release of Australian Energy Market Operator’s (AEMO) recent blueprint for the energy system of tomorrow, the 2020 Integrated System Plan (ISP).
Using project information sourced from Energetics’ market-leading research and AEMO’s system data, there is circa 1,641MW of operational grid-connected battery storage and pumped hydro assets in the NEM, with a further 420MW under construction and circa 20,274MW announced or in planning.
Figure 1: Current battery storage and pumped hydro projects
The outlook for storage: AEMO’s forecast
Based on AEMO’s 2020 ISP forecast, depending on the scenario, the NEM will need 6-19GW of new flexible, utility-scale dispatchable resources (i.e. batteries, pumped hydro and gas) to firm up the inherently variable resources. Grid scale storage is in forecast to constitute up to 7.8GW of this new capacity by 2025 under the High DER (distributed energy resources) Scenario, and 13.5GW by 2030 in addition to the operational FY20 baseline of approximately 1.1GW.
At present the total capacity in operation or under construction (i.e. committed investment) comes to 869MW for grid-scale battery and 1.34GW for pumped hydro systems. However, when you add the new battery and pumped hydro projects announced, this pushes the total shallow, medium and deep storage capacity to circa 22GW.
As seen in Figure 2, AEMO's Central Scenario appears to be on track to becoming obsolete given the number of battery storage developments that have been announced. As illustrated, the current announced total of circa 22GW is close to where AEMO forecasts Australia to be by 2040 under the High DER Scenario. This highlights the immense interest in storage. However, with so many new project announcements, not all will be delivered.
Figure 2: Dispatchable battery and pumped hydro forecast (based on publicly available data)
Number, size and locations of current operational grid-connected storage assets
As seen in Figure 3, the Hornsdale Reserve system is the market leader amongst operational grid-scale batteries at 150MW, and an energy storage capacity of 194MWh. However, with the breaking of ground in Geelong of Neoen’s new 300MW BESS, Hornsdale is now months away from losing its title of ‘Australia’s biggest battery’. As a testament to how rapidly evolving this space is, an arms race has developed between developers, who are announcing ever larger battery systems by the week. Since late 2020, Neoen, AGL, Origin, and now CEP. Energy have all announced world-leading sized BESS’s. Neoen have announced a 500MW BESS West of Sydney, Origin and AGL plan on utilising the existing transmission infrastructure at their coal-generators, Eraring and Liddell, to build a 700MW and 500MW BESS respectively. In early February, CEP. Energy went above and beyond Australia’s large ‘gentailers’, announcing a world leading 1,200MW battery to be deployed in Kurri Kurri, NSW.
Taken together, all batteries either under construction or operational, average a capacity of circa 51.38MW. Taking the recent large projects, Hornsdale, Geelong BESS, and the Wandoan BESS out of this, the average system size is 15.4MW These figures are expected to change dramatically with 35 announced battery projects with capacities 50MW or larger.
Figure 3: Current operational and under development battery systems
 Shallow storage (up to 2 hours duration), Medium storage (4 to 12 hours duration) and Deep storage (24 hours or more duration).
 The term 'gentailer' is a portmanteau word combining the terms generator. This is a reference to the vertical integration of companies operating in the NEM, where generators own a retail arm.
 For projects without a publicly announced MWh capacity, Energetics has assumed a conservative internationally aligned estimate of 1hr.
Insights and resources
Download our insights on storage and it's role in the future of the NEM
These insight articles examine the role that storage plays in addressing shape and performance risk as well as the role of storage in the future of the NEM.
ARENA Storage Knowledge BankIssued: November 2019
Large-Scale batteries are an important technology for providing reliability and stability in a high renewable electricity system, as is being developed in Australia. While the Large-Scale Battery Storage (LSBS) industry is in its early stages, the batteries which have been developed to date represent a variety of technical and commercial cases.
The Australian Renewable Energy Agency’s (ARENA) Storage Knowledge Bank is valuable source of the latest reports on lessons and innovation opportunities for LSBS projects in Australia based on specific project insights gathered through ARENA funded projects.
Australian Energy Storage Market AnalysisIssued: September 2018
This report is a comprehensive analysis of the Australian energy storage market, covering residential, commercial, large-scale, on-grid, off-grid and micro-grid energy storage. The report assesses the current state of energy storage and makes projections for uptake from 2017 to 2020.
RMI Breakthrough Batteries - Powering the Era of Clean ElectrificationIssued: October 2019
Recent rapid improvements in lithium-ion (Li-ion) battery costs and performance, coupled with growing demand for electric vehicles (EVs) and increased renewable energy generation, have unleashed massive investments in the advanced battery technology ecosystem.
RMI’s analysis identifies the implications of these breakthrough battery technologies for investors, regulators, policymakers, and other energy industry players, and identifies risk mitigation and investment strategies that can reduce potential stranded asset risks. It outlines strategies to encourage faster adoption and globally scaled manufacturing of innovative battery and storage technology ecosystems.
Related Thought Leadership
Author Joeb Northey, Anita Stadler
Service Energy and carbon markets
Date September 2020This article provide readers new to the world of storage with an introduction to key foundational concepts.