South Australia has achieved the world's highest proportion of renewable energy generation, reaching 84 percent from solar and wind in the final quarter of 2025. This shift has led to a 30 percent drop in wholesale electricity prices compared to the previous year, making them the lowest in Australia. The state's progress highlights the economic advantages of large-scale renewable adoption with battery support.
South Australia's rapid transition to renewable energy has resulted in significant reductions in electricity costs. In the final quarter of 2025, the state generated 84 percent of its electricity from solar and wind sources, the highest share among major grids globally. Officials aim to achieve 100 percent renewables by the end of 2026, supported by recent infrastructure developments.
The Australian Energy Market Operator (AEMO) reported that average wholesale electricity prices in South Australia declined by 30 percent in that quarter compared to a year earlier. This positioned the state alongside Victoria, which has the nation's second-highest renewable share, as having the lowest prices in Australia. Tim Buckley, an energy analyst at Climate Energy Finance, noted, “South Australia is a world leader in terms of its renewable energy transition... South Australian consumers are starting to really benefit from sustained, lower power prices.”
Previously, the state's aggressive renewables push faced criticism for causing price spikes during low wind or solar periods, relying on costly gas backups. Gas prices surged 500 percent in Australia after Russia's invasion of Ukraine, exacerbating volatility. To counter this, South Australia installed seven large-scale batteries, each roughly the size of a football pitch. The two most recent came online in 2025, helping stabilize supply and reduce reliance on gas.
Additional factors include the October 2025 activation of the 412-megawatt Goyder South wind farm, the state's largest, which boosts wind generation by 20 percent. Buckley explained, “Basic economics says that if you build more supply, then prices go down.” Prices turned negative for 48 percent of the quarter, as generation exceeded demand, prompting measures like battery storage or grid curtailment.
In November 2025, renewables met 157 percent of demand at one point, with excess power absorbed by batteries, exported to Victoria, or curtailed. Over half of South Australian homes now feature rooftop solar panels, and about 50,000 have home batteries. Federal incentives offering 30 percent discounts on home batteries since July 2025 have led to the highest per capita installations in the state. In December 2025, agreements were finalized for two more large wind farms to support the 100 percent target. Buckley added, “I think the target is on track and these two new wind farms will be key enablers of that.”
This model has influenced other Australian states, with reports indicating batteries are displacing gas generation nationwide.