Australia's energy companies must urgently convince millions of homeowners to hand over intermittent control of their household batteries if the country is to avoid billions of dollars in unnecessary grid spending during its transition away from coal, the nation's consumer watchdog has warned.
A new report from the Australian Competition and Consumer Commission (ACCC) has found that despite a surge in home battery installations over the past year — driven by the launch of substantial federal government rebates — the grid-scale benefits of that technology remain largely untapped because too few owners are enrolling in so-called virtual power plants.
What Are Virtual Power Plants and Why Do They Matter?
Virtual power plants are cloud-based networks operated by power retailers or technology companies that coordinate thousands of individual home batteries simultaneously, turning them into a single, unified power source capable of stabilising the electricity grid during periods of supply stress.
Participating households receive financial bill credits in exchange for allowing their energy provider to occasionally control when their battery charges and discharges. Because home batteries can store cheap solar energy generated during the day and release it during the evening peak demand period, a well-coordinated network of them can meaningfully reduce reliance on coal and gas.
As a battery energy storage system operating in isolation can only benefit its owner, the ACCC argues that synchronising large numbers of them is essential to delivering broader savings across the entire electricity network.
"Co-ordinated batteries can more reliably and efficiently respond to price signals and the needs of the energy system, resulting in further reductions in the need for grid-scale storage, enhanced system reliability and security, and lower costs for all electricity consumers," the ACCC said in its report.
Participation Rates Falling Far Short of Targets
The scale of the challenge is stark. Under the Australian Energy Market Operator's 25-year blueprint for transitioning away from retiring coal-fired generators at the lowest possible cost, around 26 per cent of Australian households would need to have batteries installed by 2050 — and more than half of those would need to be enrolled in virtual power plants.
Current figures are far below those benchmarks. Only around 3 per cent of east-coast electricity customers currently have home batteries, and of those, just 24 per cent are participating in a virtual power plant scheme. The ACCC describes the broader grid benefits being delivered by today's batteries as "incidental" — a byproduct of individual decisions rather than any coordinated system response.
Without a significant lift in enrolment, authorities warn that Australia will be forced to invest more heavily in alternatives such as gas-powered "peaker" generators — expensive facilities that fire up only during the highest demand periods and add to overall consumer power costs.
Industry Voices: It's a Trust Problem, Not a Technology Problem
Robbie Campbell, chief executive of Plico — a company that installs batteries and operates a 5,000-household virtual power plant in Western Australia — said the core obstacle was not technical.
"A battery sitting in a garage doing its own thing doesn't displace a gas peaker — a battery in a virtual power plant does," Campbell said. "Right now, most of them are sitting in garages."
Campbell placed the blame squarely on the energy industry's failure to communicate the value of participation clearly enough to ordinary consumers.
"It's a trust problem," he said, adding that too many companies had not done enough to help customers understand how the schemes worked or what they stood to gain financially.
"Households aren't going to subsidise the grid out of goodwill," Campbell said. "Show them the money, show them how it's made, and they'll stay in a virtual power plant."
His comments highlight a wider challenge facing the energy sector: even as rooftop solar and battery technology becomes more affordable and accessible — with home energy upgrades increasingly seen as a strong investment — translating individual installations into collective grid benefits requires a level of consumer trust and engagement that has so far proved elusive.
Some Experts Question the Gloomier Assumptions
Not everyone agrees the situation is as dire as the official projections suggest. Tristan Edis, head of analysis at energy consultancy Green Energy Markets, said the energy market operator's assumptions about how batteries behave outside virtual power plant arrangements may be overly pessimistic. He pointed to a growing number of retail energy products specifically designed to encourage batteries to soak up low-cost or free midday solar electricity — behaviour that delivers grid benefits even without formal virtual power plant enrolment.
The debate underscores the complexity of Australia's energy transition, where individual consumer choices, commercial incentives, and national infrastructure planning must all align if the country is to meet its clean energy ambitions without blowing out costs for households across the grid.
For now, the ACCC's message to energy companies is clear: the technology is ready, the government incentives are in place, and the grid needs the help — but winning over Australian homeowners will take more than rebates alone.
