Australia’s next energy security challenge is happening at home

As cost-of-living pressure keeps energy bills in focus and global instability continues to expose fuel supply risks, energy security is increasingly being shaped in suburban driveways and on household rooftops.

More than 4.3 million Australian homes and small businesses now have rooftop solar installed, with rooftop PV contributing 14.2% of Australia’s electricity generation in the second half of 2025 alone, according to the Clean Energy Council. Installed rooftop solar capacity has now reached 28.3GW — exceeding the capacity of Australia’s entire coal-fired generation fleet.

In South Australia, the transformation is even more visible. New minimum operational demand records were set on Christmas Day 2025, with operational demand reaching negative 263MW as rooftop solar and wind supplied more than 95% of total generation.

The question for the market is no longer whether consumer energy resources matter — but whether the grid is ready for them.

From energy insecurity to household resilience

Global instability, rising energy costs and continued concerns around fuel security are forcing Australia to rethink what energy security actually means.

The Middle East crisis has reinforced how exposed Australia remains to global fossil fuel markets, particularly for transport fuels and gas-linked electricity pricing.

“Australia’s energy system is shifting from centralised and fuel-dependent to distributed and domestically powered,” Kristen McDonald, Director of Strategic Programs at Rewiring Australia, told Energy Insights. 

“The Middle East crisis is a reminder of how vulnerable fossil fuel dependence leaves us. With Australia home to the cheapest rooftop solar in the world, accelerating its uptake is one of the most practical ways to strengthen energy security.”

It is against this backdrop that Australia’s energy security profile is being fundamentally rewritten as rooftop solar, batteries and EVs shift households from passive consumers to active participants in the grid.

“Distributed energy resources will become a valuable source of system flexibility as we transition to a renewables-led grid,” Australian Renewable Energy Agency (ARENA) General Manager of Distributed Energy Resources Leon Chanter told Energy Insights.

EVs, in particular, are becoming far more than transport assets.

“Bidirectional EV charging allows electric vehicles to do more than consume electricity,” ARENA’s General Manager of Transport Alex Grant added.

“These ‘batteries on wheels’ can return energy to homes or the grid, supporting reliability while allowing consumers to capture the value generated from their assets.”

For households, this means greater energy independence. For the system, it means less exposure to imported fuel shocks and volatile global fossil fuel prices.

The grid opportunity — and the new risks

With this urgency comes challenges.

As more households generate and export power, distribution networks are increasingly managing two-way electricity flows rather than the traditional one-way model built around centralised generation.

Marc England, CEO of Ausgrid, says distribution networks are the “missing middle” in the transition. 

“In Australia, a lot of the energy transition narrative focuses on large-scale wind, solar and high-voltage transmission. Another part of the conversation talks about what happens in households with solar panels, batteries and electric vehicles. The missing middle is the role distribution networks can play, sitting between those two.”

That creates both technical and social equity questions.

England argues household batteries often only benefit those who can afford them, while community batteries can spread benefits more broadly.

“Critically they are cheaper per kilowatt hour than a household battery; 40% in the case of Ausgrid’s Community Battery program.”

The rise of EVs also creates a major new electricity load. If unmanaged, charging could worsen peak demand. If managed well, it could strengthen the grid.

Jay Gordon, Energy Finance Analyst at the Institute for Energy Economics and Financial Analysis (EEIFA), says EVs could become a major asset.

“As EV batteries are often several times larger than a typical household battery, they can be a grid asset if well managed — charging at times when demand is low, and even contributing back to the grid via technologies such as vehicle-to-grid.”

Policy is lagging behind the technology

The biggest challenge may be that policy and market design were built for a very different energy system.

Most rules still assume households are passive consumers rather than active participants.
Lotte Wolff, Executive Manager of Advocacy and Policy at Energy Consumers Australia, says every EV and battery installed today tends to support system stability — but only if the market allows them to.

“To maximise the system stability benefits of consumer resources, we need policy that enables households and small businesses to find VPPs a more attractive proposition than they do today,” she told Energy Insights. 

She says stronger consumer protections are essential so households are not financially worse off for joining virtual power plants (VPPs), along with equal wholesale market access for VPP providers.

Gordon agrees.

“Most of Australia’s energy policies and regulations were designed for a one-way system where demand was considered inflexible.”

“This is no longer the case.” 

He argues households must be rewarded for supporting the grid, while renters and lower-income households must not be locked out of the transition.

“The rise of consumer energy resources represents an opportunity to use the grid more efficiently, and to enhance reliability,” he told Energy Insights. 

“Policies and regulations should support – not hinder – this transition.”

McDonald says the risk is not technological failure — but public trust.

“Policy needs to ensure renters and lower-income households can participate, or the transition risks losing public support.”

The next phase of energy security

Australia’s energy security debate is shifting from fuel reserves to flexibility.

The system is becoming more local, more electrified and more decentralised — but that does not automatically make it fairer or more reliable.

The next phase depends on whether regulators can redesign markets fast enough for a grid where millions of households are no longer just consumers, but critical infrastructure.