Navigating the world of solar energy in Western Australia can feel complex, with various rules and regulations governing everything from system connection to how much excess power you can send back to the grid. For Perth and regional WA homeowners considering solar panels and batteries, understanding Western Power's requirements is crucial. New connection requirements started on 1 May 2026, and the rebates for solar and batteries step down on 1 January 2027. This guide sets out the rules and approvals you need to know.
Install before 31 December 2026 to lock in this year's rebates.
From 1 January 2027 the federal battery rebate drops by about 16% (STC factor 6.8 → 5.7) and the solar panel rebate by about 20% (deeming period 5 → 4 years). It falls again in July 2027. The WA $1,300 rebate is limited to 100,000 households and is paid until the allocation runs out. Installation slots before Christmas fill fast, so lock in a date now.
Three organisations matter for solar in WA. Western Power is the state-owned network operator for the South West Interconnected System (SWIS), which covers Perth and the South West: it owns the poles and wires and sets the technical rules for connecting solar and batteries. Synergy is the retailer for almost all SWIS households and pays for your exports. Horizon Power is both network and retailer for regional and remote WA outside the SWIS.
Connecting a solar or battery system to Western Power's network needs an Embedded Generation Connection application. Homeowners are responsible for the connection, but in practice you authorise your installer to apply for you, with details of the property, the panels, the inverters and any battery. The standard application covers systems of up to 30 kVA; larger systems use separate processes.
From 1 May 2026, new requirements apply to new and upgraded solar and battery systems of up to 30 kVA on the SWIS. Western Power's 2026 Basic Embedded Generator Connection Technical Requirements and the WA Government's guidance set out the main points:
Systems installed before 1 May 2026 are not affected unless they are upgraded.
Export limits cap how much surplus power can flow into the grid at any moment. They protect local voltage and network equipment. Your own use of your solar is not limited; only what goes back through the meter.
For new and upgraded systems on Western Power's large network, the 2026 requirements set:
Homes on Western Power's smaller regional networks are assessed individually and can have lower limits.
It helps to separate three numbers: your panel capacity (DC), your inverter capacity (AC) and your export limit. The rules for claiming STCs allow panel capacity of up to 133% of the inverter's capacity, so a 5 kW inverter commonly carries 6.6 kW of panels. And because the export limit only caps what leaves the property, a bigger system can still be worthwhile if you use the extra solar yourself or store it in a battery.
Illustrative example (hypothetical): a single-phase Perth home has 6.6 kW of panels on a 5 kW hybrid inverter with a battery. At midday the inverter puts out 5 kW and the home uses 1 kW. With an export arrangement allowing 5 kW, the 4 kW surplus can go to the battery or the grid. Without one, only 1.5 kW can be exported, so once the battery is full the remaining 2.5 kW is curtailed. Because midday exports earn only 2 cents per kWh under Synergy's DEBS, the difference in credits is small; what matters most is how much of the solar the household uses.
Emergency Solar Management lets rooftop solar be reduced or switched off as a last resort during emergency low-demand events on the SWIS, to keep the grid stable. It has applied to new and upgraded systems with inverters of 5kW or less since 14 February 2022.
From 1 May 2026, new and upgraded systems up to 30 kVA must be capable of remote management, so the retailer can send emergency disconnect and reconnect instructions and manage exports. In practice there are two choices:
Either way, remote management only affects your system's output, not your household's supply from the grid.
Most Perth homes have single-phase power; newer or larger homes often have three-phase. Under the 2026 rules both can have up to 30 kVA of inverters and both have the same 1.5 kW / 5 kW export limits. The differences are in generation (15 kVA on single-phase, 8 kVA per phase on three-phase) and in phase balance: on three-phase supply, single-phase inverters must stay within an imbalance limit between phases (3 kVA for a solar-only system, 5 kVA with a battery). Three-phase power can still help homes with big loads such as large air conditioners or fast EV charging.
Timing varies, so ask your installer for a current estimate.
A system that exports needs a meter that records both what you import and what you export. Many Perth homes already have one; if not, it is arranged as part of the connection. See Bi-Directional Meters in WA: Do You Need a Meter Change?
Adding or replacing an inverter after 1 May 2026, including adding an AC-coupled battery, means all inverters on the site must then meet the new requirements together ("whole of site compliance"). Adding panels to an existing string, or adding strings with no other inverter changes, doesn't trigger that, and nor does adding modules to a battery stack installed before 1 May 2026. Inverters replaced like-for-like under warranty don't have to meet the new requirements. If you are on DEBS, check with Synergy before moving to an inverter above 5kW. See Upgrading or Adding Panels to an Older Solar System in Perth.
Under the Small-scale Renewable Energy Scheme, eligible solar systems create STCs, which your installer takes off your price. The number depends on system size, location (Perth is Zone 3) and the deeming period. Systems installed in 2026 get 5 years; from 1 January 2027 it drops to 4 years, so solar STCs fall by about 20%, and it shortens each year until the scheme ends in 2030.
Since 1 July 2025, eligible batteries also get an STC discount, which the government aims to keep at about 30% across battery sizes. For batteries installed from 1 May to 31 December 2026, each kWh of usable capacity earns an STC factor of 6.8; capacity up to 14 kWh earns the full factor, 14–28 kWh earns 60% and 28–50 kWh earns 15%. Rebates step down on 1 January 2027, when the factor drops to 5.7 (about 16% less), and to 5.2 on 1 July 2027. At around $37 per STC, a 10 kWh battery installed in 2026 gets about $2,500 and a 13.5 kWh battery about $3,400. There is no income test, and the discount can be combined with the WA rebate.
You must join a VPP product from your retailer, and the battery must be on the retailer's supported list and the Clean Energy Council's approved lists. The installer must be accredited and the vendor listed on the Plenti Vendor Directory. Households with a combined income under $210,000 can also apply for a no-interest loan of $2,001 to $10,000 over 3 to 10 years. The rebate is paid until all 100,000 planned rebates have been given out. Combined with the federal discount, a 10 kWh battery installed in 2026 could attract about $3,800 in rebates for a Synergy customer, or about $6,300 for a Horizon Power customer.
The rates apply to the first 50 kWh exported each day, for systems with an inverter capacity of up to 5kW, and did not change on 1 July 2026. Grid power on Synergy's Home Plan (A1) costs 33.26 cents per kWh from 1 July 2026, so using your own solar is worth far more than exporting it.
Horizon Power's DEBS rates depend on the town. For 2026–27 they are 10 cents (3pm–9pm) and 3 cents (other times) in lower-cost towns such as Broome and Karratha, 37.76 and 11.33 cents in medium-cost towns, and 55.99 and 16.80 cents in high-cost towns. See Horizon Power Solar Buyback for Regional WA Homes.
A hypothetical Synergy household uses about 16 kWh a day (6,000 kWh a year) and has 8.8 kW of panels on a 6.6 kW hybrid inverter with a 13.5 kWh battery.
Without the battery: on a sunny day the panels make about 30 kWh. The household uses about 8 kWh of it during the day and exports about 22 kWh, around 18 kWh before 3pm (at 2 cents) and 4 kWh after (at 10 cents): about $0.76 a day in credits. It still buys its evening power at 33.26 cents per kWh.
With the battery: about 10 kWh of the midday surplus goes into the battery instead of being exported, and covers the evening. That avoids about $3.33 of grid power a day, while giving up about $0.20 of 2-cent export credits, a gain of roughly $3.10 a day on a sunny day. Cloudy and winter days produce less.
These figures are illustrative and will vary with usage, weather, system and tariff. Always get a personalised quote.
| Incentive | Key details |
|---|---|
| STCs (solar panels) | Upfront discount, claimed by the installer. About 20% less from 1 January 2027 (deeming period 5 → 4 years). |
| Cheaper Home Batteries Program | STC factor 6.8 per usable kWh in 2026, tapered above 14 kWh; 5.7 from 1 January 2027. No income test. |
| WA Residential Battery Scheme (rebate) | Up to $1,300 (Synergy) or $3,800 (Horizon Power). VPP required. Until 100,000 rebates are paid. |
| WA Residential Battery Scheme (loan) | No-interest loans of $2,001–$10,000 over 3–10 years; household income under $210,000. |
| Synergy DEBS | 10c/kWh (3pm–9pm), 2c/kWh (other times), first 50 kWh a day. Unchanged on 1 July 2026. |
| Horizon Power DEBS | By town: from 10c/3c up to 55.99c/16.80c (3pm–9pm / other times), 2026–27. |
Q: Do I need Western Power approval to install solar in Perth? A: Yes. A grid-connected system on the SWIS needs an Embedded Generation Connection application, which your installer usually lodges for you.
Q: What are the export limits for new solar in Perth in 2026? A: For systems installed or upgraded from 1 May 2026 on Western Power's main network: 1.5 kW without an export arrangement with your retailer, and up to 5 kW with one, for single-phase and three-phase homes alike. Older systems keep the limits they were approved with.
Q: What is Emergency Solar Management and how does it affect me? A: It lets rooftop solar be reduced or switched off as a last resort during rare emergency low-demand events. From 1 May 2026, new and upgraded systems must be capable of remote management; if you don't keep your system online, exports are limited to 1.5 kW. Your supply from the grid isn't affected.
Q: Can I get paid for exporting solar in Perth? A: Yes. Synergy's DEBS pays 10c/kWh between 3pm and 9pm and 2c/kWh at other times, on up to 50 kWh a day, for systems with an inverter of up to 5kW. Horizon Power pays its own rates in regional WA.
Q: Are there rebates for batteries in WA? A: Yes: the federal Cheaper Home Batteries discount (lower from 1 January 2027) and the WA Residential Battery Scheme rebate of up to $1,300 for Synergy customers or $3,800 for Horizon Power customers, with no-interest loans for households earning under $210,000.
Use an accredited installer (accreditation is run by Solar Accreditation Australia, which took over from the Clean Energy Council) who will handle the Western Power application, set up remote management and export limits correctly, and explain the rebates in a written quote. Sun Direct Power installs solar and batteries across Perth and WA and is an approved Plenti vendor for the WA Residential Battery Scheme.
This article is general information about Western Power's solar rules, connection processes, export limits and incentives as of October 2026. Rules and programs change, so check current details with westernpower.com.au, synergy.net.au, horizonpower.com.au, cer.gov.au and wa.gov.au. It is not financial advice; worked examples use hypothetical numbers.
Sun Direct Power installs solar and batteries across Perth and WA and is an approved Plenti vendor for the WA Residential Battery Scheme. Our packages take the federal and WA rebates off the price up front, and systems start from $7,114 after rebates.
Install before 31 December 2026 to lock in this year's rebates.
Rates and rebates checked 27 October 2026.
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