In late October, the Government of Western Australia opened public consultation on a pathway to legalise plug-in solar and battery systems, making it the first Australian state to formally move in this direction. Known widely as "balcony solar", these systems are already a familiar sight across Europe — roughly one in ten German households has one installed. In Australia, however, although the products could be sold, plugging them into a household socket was never a compliant option. The consultation documents, including a draft technical standard, are open for feedback until 9 December 2026.

What the draft standard allows

Under the proposed Technical Bridging Standard (TBS) published by Western Australia's Department of Energy and Economic Diversification, compliant plug-in systems would be classed as ordinary electrical appliances. A combined solar array of up to 2 kW (DC) with an inverter of up to 800 VA (AC) could be plugged into a standard wall socket, generally without the involvement of a licensed electrician. The draft is modelled on Germany's DIN VDE V 0126-95 specification, with local adaptations for Australian plug types and wind loading.

Two details matter for the storage industry. First, the draft sets no upper limit on the capacity of a plug-in battery. Second, it restricts battery chemistry to lithium iron phosphate (LFP) and sodium-ion. In addition, each household may install only one plug-in system, and homes that already have a fixed installation such as rooftop solar are excluded from the scheme.

The consultative approach is also telling. Regulators say the final TBS is likely to be issued in two separate parts — one covering product-specific requirements and another covering installation — so that it aligns more closely with existing AS/NZS technical documents. They will also keep working with safety experts, other states and territories, and the federal government to support nationally consistent requirements for plug-in systems, and are considering further regulatory changes to improve renter access once the products become available.

Why Western Australia is moving first

The state's Energy and Decarbonisation Minister argued that until now, the benefits of cheap solar were out of reach for anyone who does not own their roof. The government estimates that a plug-in system could save a household around AUD 240 a year on power bills, or roughly AUD 500 when paired with a battery. For the roughly one third of Australians who rent or live in apartments, this is the first realistic opportunity to participate in the energy transition at low cost — and because the system can move house with the occupant, federal energy ministers have also flagged it as a practical way to extend renewable energy access to renters. Industry advocates are now pushing for a nationally coordinated framework, ideally by July next year, so that this category can be legally adopted across the whole country rather than state by state.

The economics are the core of the argument. Cheap daytime solar, combined with a small battery, can shift consumption into hours when grid electricity is expensive, reducing demand during peak periods. Advocacy groups describe plug-in systems as an anti-inflationary energy reform precisely because they put downward pressure on household bills without waiting for a rooftop installation, a building approval or a property purchase.

What it means for buyers and suppliers

• Lower entry barriers, higher safety expectations. Although plug-in systems are treated as household appliances, the draft limits battery chemistry to LFP and sodium-ion. Cycle life and thermal stability will become core criteria in product selection and procurement.
• The residential market is segmenting. From whole-home rooftop storage down to balcony-scale plug-in systems, overseas residential demand is reaching more renters and apartment dwellers. Suppliers planning product lines should pay attention to compact, easy-to-install and portable form factors.
• Track the rulemaking timeline. The proposal is still at consultation stage. The final standard is likely to be split into product requirements and installation requirements to align with the AS/NZS framework. Buyers should follow developments after the consultation closes in December 2026.

The significance of balcony solar is not that it replaces rooftop systems, but that it extends energy storage from homeowners with suitable roofs to almost everyone. As more markets open a compliant path for small-scale solar-plus-storage, competition around safety, ease of use and cycle life will shape the next stage of the residential storage market.