From 1 May 2026, significant changes to solar and battery installation requirements will reshape how renewable energy systems connect to Western Australia’s grid. Whether you’re a solar installer preparing for compliance or a homeowner planning your clean energy investment, understanding these updates is essential.
Key Changes: 1 May 2026
Increased inverter capacity limits
Households and small businesses on standard connection services can now install inverters up to 30 kVA (or an aggregate of 30 kVA across multi-inverter sites). This capacity covers rooftop solar, batteries, and other inverter-based sources combined.
What this means: Single-phase connections gain a substantial 15 kW increase in allowable installed generation capacity, bringing them more in line with existing three-phase arrangements. This change opens the door for homeowners who want larger solar arrays or comprehensive solar-plus-battery configurations.
Remote disconnection capability requirements
All new and upgraded systems must include the ability to be remotely disconnected and reconnected by your electricity retailer. Systems without this capability must be export-limited to 1.5 kW.
This requirement, commonly called emergency solar management, already applies to most residential systems participating in the Distributed Energy Buyback Scheme (DEBS). The installer must configure this capability during installation.
For Homeowners: If you’re already receiving DEBS payments, your system likely meets this requirement. Ask your installer to confirm your current system’s compliance status before planning any upgrades.
Updated inverter standards
All inverters must comply with AS/NZS 4777.2:2020 with the grid code set to “Australia Region B.” This Australian and New Zealand standard governs how grid-connected inverters operate, ensuring consistent behaviour across all installations.
Timeline and Transition Arrangements
Milestone | Date |
|---|---|
Requirements commence | 1 May 2026 |
Applies to | All new installations and system upgrades from this date |
The requirements apply to installations commissioned on or after 1 May 2026. Existing systems that aren’t being upgraded continue operating under their current arrangements.
What Homeowners Should Know
Will my existing system need changes?
If you’re not upgrading your current solar or battery system, these requirements don’t mandate changes to your existing installation. However, if you’re planning any modifications, such as additional panels, battery additions, or inverter replacements, the new requirements will apply to the upgraded components.
Cost implications
The remote management capability requirement may affect equipment selection and commissioning processes. Most modern inverters sold in Australia already support the necessary communication protocols, but installation and commissioning costs may include additional setup time for configuring remote management functionality.
When obtaining quotes, ask installers to confirm that pricing includes all compliance requirements for the new standards.
Verifying your installer's compliance
Reputable installers will be familiar with these requirements well before the May deadline. When selecting an installer, ask specifically about their process for meeting the new Western Power technical requirements and how they’ll configure remote management capability through your electricity retailer (Synergy for most residential customers).
Future opportunities
These requirements establish the foundation for participating in new energy products. Once compliant systems are installed, you may gain access to virtual power plant programs, flexible export arrangements, and other retailer products that compensate you for providing grid services.
Compliance Guide for Installers
Critical technical requirements
Installers must ensure all new and upgraded installations meet these specifications:
- Inverter capacity: Up to 30 kVA aggregate for sites on standard connection services
- Inverter compliance: AS/NZS 4777.2:2020, grid code set to “Australia Region B”
- Remote management: Systems must support disconnection/reconnection by the customer’s retailer, or be export-limited to 1.5 kW
- Configuration responsibility: Remote disconnection/reconnection capability must be set up at the point of installation
Retailer-specific processes
If you’re not upgrading your current solar or battery system, these requirements don’t mandate changes to your existing installation. However, if you’re planning any modifications—such as additional panels, battery additions, or inverter replacements—the new requirements will apply to the upgraded components.
The CSIP-AUS protocol
The WA Government’s interoperability statement promotes the Common Smart Inverter Profile – Australia (CSIP-AUS) as the preferred communication protocol. While the new rules don’t specifically mandate CSIP-AUS, the government encourages retailers to adopt this open-source protocol for managing compliance.
CSIP-AUS offers several advantages: it’s nationally consistent with other Australian states and territories, it’s already supported by most solar and battery equipment sold in Australia, and its open-source nature reduces costs for equipment manufacturers.
Essential Resources
- Western Power’s WEM Procedure for Standard Small User Facilities for detailed technical requirements
- Western Power’s Basic Embedded Generation Connection Technical Requirements for application guidance
- The New requirements for small-scale solar and battery systems web page for comprehensive industry guidance
- Synergy’s DER Functionality Requirements for retailer-specific commissioning processes
Next Steps
For Homeowners: If you’re considering solar or battery installation, now is an excellent time to begin planning. Contact a qualified installer to discuss how the new requirements affect your options and what opportunities for grid participation might become available after May 2026. McKercher Corporation’s team at PSW Energy or Perth Solar Warehouse can help you navigate these changes and design a system optimised for both current performance and future opportunities.
For Installers: Review the updated Western Power technical requirements and familiarise yourself with Synergy’s DER Functionality Requirements before the 1 May deadline. Ensure your team understands the commissioning processes for enabling remote management capability, and confirm that your equipment is CSIP-AUS compatible.
McKercher Corporation is committed to helping Western Australians navigate the evolving renewable energy landscape. Contact PSW Energy or Perth Solar Warehouse for local expert guidance on compliant solar and battery installations that position you for the opportunities ahead.
