On 1 May 2026, new requirements will commence for new and upgraded rooftop solar and battery systems installed in the South West Interconnected System (SWIS). These requirements will apply to installation of solar and battery systems for the majority of households and small businesses.
Solar and battery installers will need to ensure they are compliant with these new requirements at the time of installation.
From 1 May 2026, the following changes will come into effect:
- Households and small businesses on a standard connection service will be able to install up to 30 kilovolt-amps (kVA) of aggregate inverter capacity. This includes rooftop solar, batteries, or other inverter-based sources.
- All new and upgraded systems must be capable of being remotely disconnected and reconnected by the customers’ electricity retailer, or otherwise be export limited to 1.5 kilowatts (kW).
- All solar and battery inverters must be compliant with the Australian Standard, AS/NZS 4777.2.
More information on the changes can be found on the WA Government website.
Solar and Battery Industry Forum
Energy Policy WA, Western Power and Synergy will be holding a joint industry forum at 3pm on Thursday, 19 February 2026.
The forum will include an overview of the changes and give industry the opportunity to ask questions ahead of the 1 May 2026 commencement date.
Please register for the event using this link.
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