Australia’s electricity system is undergoing a significant transformation as coal-fired power generation declines and renewable energy sources become increasingly dominant. Evidence of this shift was evident during a heatwave in Victoria in January 2023, when temperatures exceeded 43 degrees Celsius and electricity demand reached a 17-year peak. At that critical moment, homes equipped with battery storage systems drew substantially less power from the grid compared to those relying solely on rooftop solar panels. These batteries stored daytime solar energy for use during peak evening hours, easing grid demand and reducing household electricity costs.
The Australian Energy Market Operator (AEMO) released its 2026 Integrated System Plan (ISP), outlining how the nation’s electricity network is adapting to this ongoing change. According to AEMO, renewable energy accounted for approximately 45 percent of electricity consumption across Australia’s eastern states over the past year. Additionally, more than one-third of households have installed rooftop solar panels, collectively forming the largest single source of electricity generation. Alongside the rapid uptake of household batteries, grid-scale battery storage now meets about 20 percent of peak electricity demand by storing surplus energy generated during the day.
Coal generation, which powered Australia’s electricity system for a century, is in substantial decline. Nearly 40 percent of original coal-fired plants have retired, with the remaining stations aging and increasingly prone to breakdowns and lengthy maintenance. Given these trends, the transition is seen as inevitable, shifting the focus to what replaces coal and how to manage the costs for consumers and businesses.
AEMO CEO Daniel Westerman emphasized that the most cost-effective way to ensure reliable power as coal plants close involves a system centered on renewable generation, supported by energy storage and flexible gas-powered backup. He stressed the importance of efficient transmission infrastructure to deliver low-cost electricity across the country. Though transmission projects can face community resistance, Westerman highlighted that every major transmission investment identified by the ISP is expected to return its costs and yield benefits totaling about AU$30 billion in avoided expenses for consumers over coming decades.
The plan also identifies growing electricity demand as a major challenge, with total consumption expected to nearly double by 2050 due to increasing electrification of homes and industry. Data centres, for instance, are predicted to expand from 2 percent of current electricity use to nearly 10 percent by mid-century.
Despite the ambitious projects underway, delivery challenges remain. The capacity of new generation and storage developments in the pipeline nearly equals the size of the existing fleet, raising concerns about potential delays. Such setbacks could increase costs and risk the reliability of electricity supply.
Westerman concluded that Australia has a clear, economically viable pathway to transition away from coal, but success depends on coordinated efforts among governments, industry, and communities. The system’s gradual evolution—illustrated by the January heatwave response—provides a preview of the future electricity landscape Australia is working to realise.