Australian households and businesses are set to benefit from a significant shift in the National Electricity Market (NEM), with new data revealing wholesale electricity prices plunged by 32.7% year-on-year to an average of $65.22/MWh in August 2026. This sharp decline is largely attributed to the unprecedented rise of battery storage, which dramatically reduced the reliance on gas-fired generation during critical evening peak demand periods.
Analysis from consultancy EnergyEdge found that gas generation during the busy early evening hours (5 pm to 8 pm) fell by a substantial 67% in the year to August 2026. During the same period, batteries, both grid-scale and residential, met nearly half — 49% — of the grid’s dispatchable power needs in the evening. This marks a monumental shift from 2020, when batteries accounted for just 0.4% of dispatchable power during this peak.
“The rate of installation of batteries in Australia is the fastest uptake of any electricity asset ever – faster than solar, faster than wind,” said Josh Stabler, EnergyEdge’s managing director.
This rapid integration of battery technology is now directly influencing wholesale prices, with the Australian Energy Market Operator (AEMO) also reporting gas generation hitting its lowest Q2 average in over two decades earlier this year.
State-by-State Wholesale Price Reductions in August 2026
The downward trend in wholesale prices was evident across the mainland NEM states, offering a positive outlook for future retail bill adjustments. While wholesale prices don’t immediately translate dollar-for-dollar to consumer bills due to network and retail costs, sustained reductions typically flow through over time.
| State | August 2026 Average Spot Price | Year-on-Year Decline (August 2025 vs. August 2026) |
|---|---|---|
| Queensland | $60.42/MWh | 22.7% |
| Victoria | $60.40/MWh | 35.2% |
| New South Wales | $75.71/MWh | 25.2% |
| South Australia | $71.62/MWh | N/A (remained highest-priced mainland state) |
Source: Leading Edge Energy, August 2026 Electricity Market Review
Victoria recorded the largest year-on-year decline at 35.2%, with its average spot price dropping to $60.40/MWh. Queensland followed closely, with a 22.7% reduction to $60.42/MWh, making it the lowest-priced mainland state. New South Wales saw its average spot price fall by 25.2% to $75.71/MWh. South Australia, despite the overall NEM trend, remained the highest-priced mainland state at $71.62/MWh in August.
The Battery Effect: Reshaping the Evening Peak
The most impactful finding from the recent analysis is the structural shift occurring during the critical evening peak. Traditionally, this period saw a surge in demand met by expensive gas-fired power stations. However, the rapid deployment of battery storage is fundamentally changing this dynamic.
Around 500,000 home batteries have been installed under government subsidy programs, complementing the increasing number of large-scale grid batteries coming online. These batteries are now soaking up abundant solar energy during the day and discharging it during the evening, effectively displacing gas.
This trend is not only reducing emissions but also lowering volatility in the system, which should translate to more stable and lower prices in the long term. The Grattan Institute’s energy and climate change program director, Alison Reeve, noted that utility-scale batteries are increasingly “mopping up surplus renewable energy in the middle of the day and displacing the role of gas during the peak.”
For homeowners, investing in battery storage can significantly enhance these savings by allowing them to store their own solar generation or take advantage of off-peak grid electricity. Exploring options like joining a Virtual Power Plant (VPP) can further amplify these benefits. Maximise Your Home Battery Savings: Earn $1,000+ Annually with a VPP in 2026
While wholesale price reductions are a strong indicator of downward pressure on retail bills, the full impact on consumers typically takes time to materialise as retailers adjust their offerings. However, the consistent trend of falling wholesale costs driven by renewables and batteries signals a more affordable energy future for Australians.
Consumers are encouraged to stay informed about their energy plans and compare offers regularly. The Default Market Offer (DMO) provides a safety net and a reference price for comparing market offers in NSW, South Australia, and South East Queensland. From 1 July 2026, the DMO has been expanded to include more tariff types and a specific Solar Sharer offer, providing more options for consumers with smart meters.
As Australia’s energy mix continues its rapid transformation, the growing role of batteries in stabilising the grid and reducing reliance on fossil fuels during peak demand periods is a clear win for both the environment and consumer wallets. For those considering home battery solutions, understanding the available options and their benefits is crucial. Best Home Batteries for Australian Homes 2026: Performance, Warranties & Value Compared
This August 2026 data underscores that the energy transition is not just about clean power; it’s about delivering tangible price benefits to Australians. The continued investment in both grid-scale and residential storage will be key to sustaining these positive trends.