Power Prices Plummet as State Nears 100% Renewable Energy Transition

As South Australia progresses toward achieving its ambitious goal of operating entirely on solar and wind energy, electricity prices have decreased by one-third over the past year, making them the lowest in Australia. This state serves as a leading example of the economic advantages linked to large-scale grid decarbonization.

“Tim Buckley, an independent energy analyst at Climate Energy Finance, an Australian think tank, highlights that South Australia has emerged as a global leader in renewable energy transition. While this transformation comes with challenges, we take pride in our successes. South Australian consumers are now reaping the benefits of consistently low electricity prices,” he states.

In the final quarter of 2025, South Australia generated an impressive 84% of its electricity from solar and wind sources. This exceptional percentage makes it the highest among major global power grids, with plans to reach 100% by the end of next year.

This renewable energy push is driving electricity prices down. The Independent Australian Energy Market Operator (AEMO) reported that South Australia’s average wholesale electricity price fell by 30% in the last quarter of 2025 compared to the previous year. Consequently, the state now shares the title of Australia’s cheapest state with Victoria, which also boasts a significant share of renewable energy.

This is a significant achievement for the South Australian government, previously criticized for rising electricity prices due to rapid renewable energy implementation. Occasionally, electricity bills surged as the state relied on costly gas energy when wind and solar outputs dwindled. Gas producers charged high prices to meet sporadic demand, a challenge exacerbated by rising petrol prices in Australia, which surged by 500% following Russia’s invasion of Ukraine.

To reduce price fluctuations, South Australia has developed seven extensive batteries comparable to football fields. These batteries harness energy generated by nearby solar and wind farms on sunny, windy days, providing backup power when conventional sources fall short. The introduction of two new batteries in 2025 significantly contributed to lowering energy costs.

The success of these batteries has motivated other Australian states to invest in similar technologies. Last week, consultancy Rystad Energy noted in a report that utility-scale batteries are no longer merely supplementary technology in Australia’s energy landscape, actively replacing gas fueled generation across several states. Consequently, Australia is becoming a global showcase for the effectiveness of battery technology in energy storage.

A new massive wind farm in South Australia, named Goyder South, which opened in October, is also contributing to lower electricity prices. With a capacity of 412 megawatts, it is the largest in the state and is expected to boost wind energy generation by 20%. Buckley emphasizes, “Basic economics indicates that increasing supply leads to reduced prices.”

AEMO’s report also highlighted that wholesale electricity prices were negative for approximately 48% of the time in the past quarter, indicating that the state produced more electricity than consumed, resulting in incentives for electricity suppliers to halt production during excess generation periods.

For instance, in November, South Australia achieved a remarkable milestone when it met 157% of its electricity demand solely through renewable energy. In these instances, excess wind and solar power caused temporary disconnections from the grid, allowing batteries to store the surplus energy for later use or export to nearby Victoria.

Many households in South Australia are also reducing their dependency on grid electricity by generating their own power. Over half of the residences now have solar panels installed, harnessing daytime sunlight for energy. Additionally, nearly 50,000 households have invested in home storage batteries, charged during the day and utilized after sunset. Since the launch of a 30% rebate on household batteries in July 2025, South Australia leads the nation in per capita home battery installations.

In December, the state concluded agreements to construct two additional large-scale wind farms, vital steps toward achieving its goal of 100% net renewable energy by next year. “We are well on our way to achieving this target, and the new wind farms will play a critical role in this success,” Buckley stated.

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