Big Batteries Outcompete Gas in Australia’s Grid | TechXplore
Australia’s Grid Revolution: Batteries Overtake Gas as Energy Landscape Shifts
SYDNEY – Australia is experiencing a rapid and profound transformation in its electricity grids, driven by the surging adoption of renewable energy sources and, increasingly, large-scale battery storage. For years, gas-fired power plants were considered essential to “firm” intermittent renewable energy – ensuring a reliable power supply when the sun isn’t shining or the wind isn’t blowing. However, a new reality is emerging: batteries are not just supporting renewables, they are actively displacing gas, particularly in Western Australia, and reshaping the nation’s energy future.
The Rise of Grid-Scale Storage
Since 2015, solar and wind have accounted for 99% of new generating capacity added to Australian electricity grids. Last month, renewables achieved parity with fossil fuels for the first time, a pivotal milestone in the country’s clean energy transition. But the real story lies in the parallel growth of battery storage. Capacity in the pipeline has exploded, soaring from 3 gigawatts in 2022 to a projected 26GW across the National Electricity Market (NEM) by 2025, according to the Australian Energy Market Operator (AEMO). This dramatic increase reflects a growing confidence in the ability of batteries to provide essential grid services.
Batteries excel at absorbing excess solar energy during peak production and releasing it during periods of high demand, such as evenings. They also rapidly ramp up output and stabilize voltage, enhancing system security. This versatility is proving crucial as Australia moves towards a higher penetration of renewable energy. The shift is particularly noticeable in Western Australia (WA), which operates its own isolated power grids, allowing for faster adoption of new technologies.
Western Australia: A Testbed for the Future
WA is leading the charge, with renewables now supplying over 55% of the electricity to its Wholesale Electricity Market. Batteries are increasingly surpassing both large-scale solar and gas generation in meeting peak demand. This trend is not merely a local phenomenon; it signals a broader shift in how electricity grids are managed globally. Major new battery systems have been deployed in Kwinana, an industrial area of Perth, and Collie, a former coal mining town, collectively boasting over 5 gigawatt-hours of storage capacity. These systems recently supplied over 20% of evening peak demand, exceeding the output of gas-fired power plants.
The success in WA demonstrates the viability of a grid powered primarily by renewables and batteries, even without relying on hydropower or interconnections to other states. This is particularly significant given Australia’s position as one of the world’s largest exporters of liquefied natural gas (LNG). According to the World Bank, global LNG trade reached $454 billion in 2022, highlighting the economic importance of this fuel source. However, Australia’s experience suggests a potential decoupling of its export revenue from its domestic energy policy.
Economic Implications and Policy Responses
The declining cost of grid-scale batteries is a key driver of this transformation. Analysts predict that batteries will struggle to compete with gas and even hydropower over the next decade. AEMO’s latest plans anticipate the need for 14GW of gas power capacity by 2050, but envision gas primarily serving as a backup for renewables and storage, rather than a primary source of power. However, even this role is uncertain as battery technology continues to improve and costs fall.
Investment in grid batteries has surged, increasing from A$100 million to billions of dollars annually. The federal government’s home battery subsidy scheme has also proven popular, with over 146,000 installations to date, although concerns remain regarding cost overruns and battery sizing. Furthermore, the potential of distributed energy storage – including home batteries and electric vehicle (EV) batteries – to contribute to overall grid stability is gaining recognition. The integration of EVs into the grid through Vehicle-to-Grid (V2G) technology could further reduce the need for large-scale storage investments.
Beyond Capacity: Addressing Grid Stability
A critical challenge for clean energy grids is replacing the inertia provided by the spinning turbines of traditional coal and gas plants, which have historically stabilized electricity voltage. Fortunately, large batteries can now provide this essential service without relying on rotating machinery. This capability is prompting discussions about allowing batteries to fully stabilize the grid – essentially providing its “heartbeat” – and is driving innovation in grid-forming inverters and virtual synchronous machines. Real-world applications in Australia and elsewhere demonstrate that batteries can deliver this functionality more precisely and efficiently than fossil fuel plants.
The transition isn’t without its complexities. Coordinating the use of Australia’s rapidly growing household energy storage capacity and harnessing the potential of EV batteries through V2G technology will be crucial to optimizing grid performance and avoiding unnecessary investments in grid-scale storage. As the energy market operator’s plans make clear, the optimal future grid will be a diversified system combining grid-scale batteries, pumped hydro, demand-side management, and widespread rooftop solar, home batteries, and EV batteries.
The Australian experience offers valuable lessons for other countries seeking to decarbonize their electricity grids. It demonstrates that a rapid transition to renewable energy, supported by large-scale battery storage, is not only technically feasible but also economically viable. As battery technology continues to advance and costs decline, the future of electricity grids is increasingly likely to be powered by clean, reliable, and sustainable energy sources.