Renewables and Big Batteries Drive Wholesale Electricity Prices Down
Australian households and businesses are getting a glimpse of a cheaper energy future, as new data reveals a massive increase in battery storage and renewable generation is successfully driving down wholesale electricity prices. A recent report from the Climate Council highlights that large-scale batteries supplied 3.5 times more energy to the grid this past summer compared to the previous year, a critical factor in a 30% reduction in wholesale electricity prices year-on-year.
This influx of renewable energy is creating a powerful buffer against the volatile global fuel markets that have caused price shocks in recent years. While international conflicts continue to create uncertainty for fossil fuel prices, Australia’s accelerating transition to renewables is providing increased energy security and price stability.
Analysis from energy market specialist Flow Power confirms the trend, noting that average wholesale spot prices in the National Electricity Market (NEM) were lower in March than in February across all mainland states. New South Wales saw the most significant drop of $13.41 per megawatt-hour (MWh). This price relief comes from the combination of plentiful renewable generation and seasonally lower demand.
“In the past four months, big batteries alone have reduced gas use in our main grid by 8.1 petajoules, equivalent to the annual gas use of 163 thousand Victorian homes.” - Climate Council Report, April 2026
The Decline of Gas and its Impact on Prices
The growing influence of battery storage is directly displacing more expensive gas-fired generation, which has historically set the price during peak demand periods. The Climate Council’s analysis shows that in the four months leading up to April 2026, large-scale batteries slashed gas consumption by 8.1 petajoules. This reduction in reliance on gas has so far limited the flow-on effects of recent global conflicts on the Australian electricity market.
This is a significant shift. While gas generates less than 5% of the power in the main grid, its role as a ‘peaking’ fuel gives it an outsized influence on setting the highest wholesale prices. By deploying battery-stored solar power during these peak times, the grid avoids firing up expensive gas plants, leading to lower overall costs.
This trend is also reflected at a household level. The approximately 400,000 Australian homes that have paired rooftop solar with a home battery are reportedly achieving bill reductions of up to 90%, further reducing strain on the grid during peak demand.
What Does This Mean for Your Energy Bill?
The sustained drop in wholesale costs is the primary driver behind the significant retail price cuts proposed by the Australian Energy Regulator (AER) for the 2026-27 financial year. The AER’s draft Default Market Offer (DMO), which acts as a price cap for customers on standing offers, has flagged potential price drops of up to 10.1% for households and 21.2% for some small businesses from July 1.
For residential customers, this could translate into annual savings of over $200 in parts of New South Wales and South East Queensland. The AER directly credits falling wholesale costs, driven by increased renewable output, for the proposed relief.
However, experts caution that the market remains sensitive to global events. AER Chair Clare Savage noted that while forward wholesale contract prices for 2026-27 are lower than last year, the regulator is closely monitoring international developments ahead of its final DMO decision in May 2026. While the outlook is positive, the recent drop in petrol and diesel prices serves as a reminder of how quickly global market conditions can change. For now, the data clearly shows that investment in Australia’s renewable energy and battery storage capacity is paying real dividends, delivering both emissions reductions and tangible cost savings for consumers.