Western Australia (WA) has already done what most energy markets are still trying to achieve. Around 40% of households across the SWIS now have rooftop solar, and on clear days, it supplies a significant share of daytime demand. In the middle of the day, the challenge now is managing how much is already there.
That’s why the next phase of the transition isn’t showing up in new solar installs. It’s showing up in places like Albany, where a private gas network run by ATCO Australia is being shut down because it no longer makes economic sense to maintain. About 8,000 homes and businesses now have a fixed window to decide what replaces it.
This isn’t about adoption. But rather, it’s a preview of what happens when an existing energy system reaches its limit, and what comes next when households can’t delay the decision anymore.
How far solar has already gone in WA
Around four in ten households on the SWIS have installed solar, and in some areas, it’s become the default rather than the exception.
This level of uptake has changed how the grid behaves. On clear days, rooftop systems can supply a large share of total demand, pushing operational demand to record lows in the middle of the day. What used to be a peak generation period is now a balancing challenge, with excess solar needing to be managed in real time.
The policy response reflects that shift. New requirements introduced in 2026 focus less on encouraging installations and more on controlling and coordinating existing systems (from flexible exports to remote management capabilities). The question in WA is how to operate a grid where solar is already everywhere.
Why solar adoption doesn’t complete the energy system
High solar uptake has changed the electricity supply. But it hasn’t replaced the full energy load inside the home. Many WA households still rely on gas for hot water, cooking, and in some cases heating, which sit outside what rooftop solar directly covers.
That creates a split system. Electricity is increasingly solar-driven during the day, while key household functions continue to depend on a separate gas connection. The result is a setup where one part of the home is already transitioning, while another remains tied to legacy infrastructure.
This is why high solar penetration doesn’t automatically lead to full electrification. Panels reduce grid electricity use, but they don’t remove the need to replace gas appliances, upgrade wiring, or rethink how energy is used across the home. Until those changes happen, solar sits alongside the existing system.
What happens when gas infrastructure reaches its limit
In Albany, that split system is being forced to close. ATCO Australia is shutting down its private gas network, which serves around 8,000 homes and businesses, after determining that replacing the ageing infrastructure no longer stacks up financially.
This isn’t a policy-led phase-out. The network is reaching the point where the cost of maintaining and renewing pipelines outweighs the value of keeping it running. Instead of a gradual decline, the system is being wound down on a defined timeline of roughly three years.
That changes the nature of the transition. Gas doesn’t taper off, but it disappears. Households and businesses are no longer deciding if or when to move away from it. They’re being asked what replaces it, and how quickly they can make that change.
How forced timelines change energy decisions
A fixed shutdown date compresses decisions that would normally be spread over years. Instead of replacing systems as they fail, households and businesses in Albany have to plan multiple changes at once, often within the same budget cycle.
That changes the criteria. The focus moves from long-term optimisation to what can be done within the timeframe. Cost, installation lead times, and disruption start to outweigh theoretical efficiency. A full electrification pathway may still make sense on paper, but it has to compete with options that are faster to deploy and easier to manage in the short term.
For businesses, the pressure is more immediate. Any downtime affects operations, so the priority becomes continuity. For households, the question is how much can realistically be upgraded at once without stretching finances. In both cases, the timeline narrows the decision to what is workable now and what would be ideal over time.
Why not every household goes fully electric
Even with a sealed end date for gas, full electrification isn’t a straightforward switch. Replacing a single appliance is manageable. Replacing an entire system is different.
For many homes, moving off gas means upgrading water, cooking, and heating at the same time, alongside electrical work to support the added load. That can involve switchboard upgrades, new circuits, and coordination across multiple trades. When those changes are bundled together, the upfront cost rises quickly.
Under a fixed timeline, that comes the constraint. Some households will move fully electric, particularly where systems are already due for replacement. Others will take a staged approach, or opt for interim solutions like bottled LPG to keep existing appliances running while deferring larger upgrades.
The result isn’t a uniform shift to electrification. It’s a mix of outcomes shaped by cost, timing, and how much change each household can absorb at once.
How Albany points to what could happen elsewhere in WA
Albany is a single location, but the conditions behind it aren’t isolated. Gas networks are long-life assets, and many are reaching the point where maintenance and replacement costs start to climb, particularly in lower-density areas.
When that happens, the decision isn’t always to keep the system running. It becomes a question of whether it still makes economic sense to maintain it all. In Albany, the answer was no.
That shifts how the transition unfolds. Moving away from gas is often treated as something households can time around upgrades or renovations. Albany shows that in some cases, timing isn’t flexible. When the underlying infrastructure reaches its limit, the transition is no longer gradual. It’s set by the system itself.
Prepare for a transition that moves from adoption to replacement
WA has already moved past the phase where the focus was getting solar onto rooftops. That part of the transition is largely in place. The next phase is less visible, but more complex. What happens when existing energy systems no longer hold.
Albany brings that info focus. The shift isn’t about adding new technology alongside what’s already there. It’s about replacing entire systems when they reach the end of their economic life.
That changes the role of timing. Instead of upgrading gradually, households may need to make multiple changes at once. Instead of optimising around existing setups, they’re rebuilding how energy is used across the home.
The transition doesn’t stop at adoption. It moves into replacement, and in some cases, that arrives faster than expected.
Energy Matters has been in the solar industry since 2005 and has helped over 40,000 Australian households in their journey to energy independence.
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