Can you increase your solar export limit in Perth?

Perth households with solar are typically approved for a standard export limit at installation: usually 5kW (uncontrolled) in most areas, or 3kW in suburbs where the local network has reached high solar penetration. Some small percentage of properties receive zero export approval.

If you're on a constrained limit and want to increase it — or if you're planning a larger system and need more export headroom — here's what the process involves.

Why export limits exist

Western Power's distribution network was designed to carry power from substations to homes, not to aggregate power flowing in the other direction from thousands of rooftop solar systems. When too many homes export simultaneously, local line voltage rises above safe operating limits (statutory maximum 253V on LV lines). High voltage causes inverters to trip off (a self-protection mechanism).

Export limits cap the amount of power each home can push to the grid, preventing voltage rise problems in areas where many homes export simultaneously. Areas with high solar penetration get tighter limits — this is why inner-ring suburbs like Fremantle, Cottesloe, and parts of the north-east metro have more constrained limits than newer outer-suburb areas.

The standard export limit at installation

When your installer applies to Western Power for your solar connection, they submit the system details and proposed export limit. Western Power's approval process:

• Pre-approved (fast track): systems under 5kW inverter capacity with standard 5kW export limit. Approved within a few business days, minimal network assessment.
• Non-standard assessment: systems over 5kW, or any system requesting more than the area's standard limit. Requires a formal network assessment from Western Power's planning team, taking 20–40 business days.

If your area already has high solar penetration, Western Power may approve your system but with a reduced export limit (e.g. 3kW instead of 5kW, or zero export). You receive a "controlled export" agreement or a "zero export" condition.

How to apply for an export limit increase

Step 1: Check whether an increase is possible
Contact Western Power's solar enquiry line or submit an online enquiry specifying your address and the export limit increase you're seeking. Western Power will advise whether your network zone can accommodate an increase — this preliminary check is free and gives you the likely answer without a formal application.

Step 2: Formal application via your installer
Export limit changes require a formal Western Power application, submitted by a licensed electrical contractor (your solar installer or a new contractor). This is not something you can submit yourself as a homeowner.

Cost: Western Power charges a fee for formal network assessment applications — typically $200–$600 depending on the assessment complexity. This fee applies regardless of whether the application is approved.

Timeline: 20–40 business days for a formal assessment once submitted.

Step 3: What happens if approved
Western Power issues a revised connection agreement with the new export limit. Your installer may need to update your inverter's export limit setting if it was previously capped by software. No new panels or hardware may be needed if your inverter was already capable of higher export.

Realistic expectations for approval

Likely to be approved:

• Outer suburbs with newer network infrastructure and lower solar penetration
• Properties where the constrained limit was set at installation due to a precautionary standard that has since been reviewed
• Areas where Western Power has since upgraded local transformers or line infrastructure

Unlikely to be approved:

• Inner-ring suburbs with 40%+ solar penetration (Fremantle, South Perth, Applecross, Cottesloe, Scarborough, Innaloo area)
• Properties where the network already experiences voltage rise during solar peak hours
• Substations that are at or near their two-way power flow capacity

Western Power does not publish approved/denied rates by suburb, but your installer will usually have a practical sense of what's achievable in your area based on recent applications.

What to do if an increase is denied

Battery storage: a battery system lets you store excess solar that would otherwise be curtailed by the export limit. Rather than exporting at 2c/kWh up to your limit and then spilling the rest, you store it and use it in the evening at the full avoided-tariff value (33.26c+ under A1, 55.33c during Midday Saver peak). This converts "wasted" generation into valuable self-consumption.

Accept the limit: for most Perth households, a 5kW export limit is sufficient. A typical 6.6kW system with good self-consumption will only export 3–4kW at peak, well within the limit. A 3kW limit is more constraining for larger systems.

Optimise generation timing: if export is limited, orient panels to match your own consumption times rather than maximising noon-peak generation. A west-facing split maximises afternoon generation when many households consume more — a better self-consumption match than a pure north-facing system that peaks when you're exporting.

Western Power's network assessment fees and timelines are current as of June 2026. Applications are processed by Western Power's Solar and Storage team.