Large-scale batteries are transforming the global power sector by enabling greater use of low-cost solar and wind energy and reducing reliance on fossil-fired generation. In Australia's National Electricity Market (NEM), the average wholesale spot price fell 47% year-over-year in Q2 2026, partly driven by a near one-third drop in gas-fired generation due to an explosion in grid-scale battery storage. Australia now leads in per-capita deployment of large-scale batteries, which the International Energy Agency calls the world's fastest-growing power technology.
These batteries store cheap renewable energy during periods of abundance and discharge it later, helping lower electricity costs and carbon emissions. However, the rapid expansion has smoothed out market volatility, reducing the profit margins for battery operators. The installed battery storage fleet on the NEM was more than twice as large in Q2 2026 compared to the previous year, but sector revenue dropped 56%.
Xavier Barbaro, CEO of Neoen, describes Australia as a "postcard from the future" for the global energy storage sector, while warning of the risks of "cannibalisation" — where increased supply drives down prices and profits. Ed Porter of Modo Energy notes that early battery projects earned high returns competing against gas peaker plants, but as deployment scales, batteries increasingly compete with each other, pushing prices down. Companies like Neoen are adapting through advanced bidding strategies, algorithms, and diversified service offerings to maintain profitability.
The Australian experience highlights both the promise and peril of the big battery business model as the sector grows globally.
Source: Financial Times Companies · Summarized by HeadlinesBriefing