Australia's battery fleet doubles in a year as AEMO shifts grid strategy away from costly syncons
Record 2 GW of new big battery capacity added in 2025 makes Australia the world's third-largest market, reshaping NEM price dynamics and grid investment.
The Clean Energy Council's tally for 2025 shows Australia added a record 2 gigawatts of new utility-scale battery capacity, a 233 percent jump on 2024 that makes the country the third-largest big battery market in the world behind only China and the United States.2 That matters for anyone trading the National Electricity Market because the storage build is smoothing out the volatile price swings that have historically defined Australia's grid, and it is doing so faster than the most optimistic industry forecasts.8
The numbers behind the boom are substantial. Another 4.3 GW and 13.5 GWh of big battery capacity was financially committed over the year, worth A$4.8 billion of investment, a 67 percent increase on the prior year's level.2 The AGL Energy-owned 500 MW, 1000 MWh Liddell Battery is in the tally, though its first stage of 250 MW and 500 MWh only technically started commissioning at the start of this year.2 Equis and the Victoria government-owned State Energy Corporation contributed the 600 MW and 1600 MWh first stage of the Melbourne Renewable Energy Hub.2
Mid-year, Akaysha Energy's Ulinda Park battery near Millmerran in Queensland moved through commissioning, with its 55 MW/298 MWh first phase becoming operational.2 The CEC expects the trend to continue, noting that "batteries start to compete more often with each other rather than with gas peakers."2 That sentence should give gas-fired peaking plant owners in the NEM some pause about forward revenue expectations.
The storage surge is colliding with an equally remarkable run in renewable generation. In the National Electricity Market, renewables supplied 46.5 percent of generation in the first quarter of 2026, the highest share on record for a first quarter, driven by increased wind and solar output with batteries playing a greater role in market operations.4 This follows a fourth quarter last year that saw demand hit a record high while renewable energy supplied more power than fossil fuels across Australia.1
But the divergence buried in these numbers is stark. Despite the battery momentum and record renewable share, financial commitments for new generation slumped by 46 percent in 2025, with only 2.3 GW of new renewable energy generation reaching financial close last year.4 Government tenders have been busy, not the market. The federal government's Tender 7 of the Capacity Investment Scheme awarded 19 projects set to deliver 7.8 GW of renewable generation and a further 7.9 GWh in battery storage through hybrid projects.4
Following these tenders for nearly 10 GW of new capacity, Australia's pipeline of probable clean energy projects jumped by about 30 percent to as much as 32.3 GW in the biggest surge on record, according to data compiled by the Australian Energy Market Operator and reported by Bloomberg on Thursday (2026-06-18).4 The total of accredited, committed and probable projects has soared to nearly 70 GW.4
The battery build is also forcing a rethink in how the grid maintains system strength. AEMO is looking to battery inverters as synchronous condensers prove expensive and hard to obtain, with Transgrid reducing the number of syncons it was installing because of soaring prices.6 Transgrid had flagged that syncon costs had doubled in the four years prior to announcing a revised budget of A$1.2 billion for its first 10 syncons.6
The demand side is shifting too. Household electricity usage is forecast to almost halve over the next 25 years due to the booming adoption of rooftop solar panels and batteries, but overall grid demand could double because of businesses' power needs.7 Electric vehicle sales reached 157,000 units, representing 38 percent year-over-year growth, while expanding data centre capacity is projected to reach 6.5 GW.3
South Australia's day-ahead power spot price settled at A$55.48/MWh on Monday (2026-08-17), with the AUD trading at 0.71 against the US dollar. [live_prices] The state has been at the forefront of the battery build and its prices have been among the most visibly affected by the storage influx.
The unresolved tension is whether the financial close drought in new generation means the pipeline stalls just as coal exits accelerate. Australia's main grid will probably avoid major supply shortages next summer, but risks escalate in later years as ageing coal plants exit potentially faster than new renewables and storage projects come online.5
Traders should watch whether the CIS tender schedule can keep filling the gap left by the private sector, and whether battery-vs-battery competition starts to erode the arbitrage revenues that made the 2025 build financially viable in the first place.2 The next quarterly CEC report will show whether the commissioning pipeline holds up or whether the 46 percent slump in financial close becomes a bottleneck rather than a blip.4