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Federal and state policy, rebates, and incentives for solar and batteries in Perth, Western Australia
Note: Rebate amounts and eligibility criteria can change. STC prices fluctuate with market conditions. Confirm current rates and eligibility with your installer or check official government sources before making decisions.
Current WA framework (in force since 1 May 2026)
Solar and battery installations now follow the WEM Procedure for Technical Requirements: CSIP-AUS compliance, tier-based export limits, and customer tier options. Learn more below.
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The federal Small-scale Technology Certificate scheme now steps down twice a year (H1 and H2), so an earlier install draws a higher factor. The program ends December 31, 2030.
2026 H1
8.4
STCs/kWh
$3,352*
Jan 1 - Apr 30
2026 H2
6.8
STCs/kWh
$2,713*
May 1 - Dec 31
2027 H1
5.7
STCs/kWh
$2,274*
Jan - Jun
2027 H2
5.2
STCs/kWh
$2,075*
Jul - Dec
2028 H1
4.6
STCs/kWh
$1,835*
Jan - Jun
*Estimated value for 10kWh system at ~$39.9/STC. Actual STC prices fluctuate with market conditions. STCs are rounded down to whole numbers.
| Period | STCs/kWh | 10kWh Value* |
|---|---|---|
| Jan-Apr 2026 | 8.4 | $3,352 |
| May-Dec 2026 | 6.8 | $2,713 |
| H1 2027 | 5.7 | $2,274 |
| H2 2027 | 5.2 | $2,075 |
| H1 2028 | 4.6 | $1,835 |
| H2 2028 | 4.1 | $1,636 |
| H1 2029 | 3.6 | $1,436 |
| H2 2029 | 3.1 | $1,237 |
| H1 2030 | 2.6 | $1,037 |
| H2 2030 | 2.1 | $838 |
Capacity taper (in force since 1 May 2026): 5-14kWh receives 100% of STCs, 14-28kWh receives 60%, and 28-50kWh receives 15%.
The federal SRES pays an upfront rebate for solar panels through STCs. The current factor is 6.8 STCs/kWh (May–Dec 2026, down from 8.4 Jan–Apr), at ~$39.9 per certificate. The rate steps down each year until 2030.
Learn more →Batteries receive federal STCs separately from solar panels. Key limits under the Cheaper Home Batteries program:
WA state rebate for battery storage systems on the Synergy network:
Ongoing credits for VPP participation
Synergy's Battery Rewards program pays ongoing credits when your battery responds to Virtual Power Plant (VPP) events. These credits are separate from the state rebate and federal STCs, and paid on top of them.
70¢
per kWh discharged during activation events
~$100-140
annual VPP credits for 10kWh battery (15-25 events/year)
15-25
typical activation events per year (avg 2-3hrs each)
You can stack federal Battery STCs and the WA state rebate. For a typical 10kWh battery system at the current 6.8× STC factor (May–Dec 2026), the two together return roughly $4,000 for Synergy customers.
Solar and Battery STCs are separate. Adding a battery to an existing solar system earns Battery STCs for the battery. A new solar and battery system installed together earns both Solar STCs and Battery STCs.
Total savings: $4,013 (33%). Note: 10kWh falls within the 5-14kWh tier, so receives 100% of Battery STCs.
Estimate your rebate total
The calculator applies current 2026 rebate rates to your system size.
Federal STCs now step down twice a year. A 10kWh system installed Jan-Apr 2026 receives 84 STCs (~$3,352). The same system installed May-Dec 2026 receives 68 STCs (~$2,713), a 19% reduction. By H1 2027 it drops to 57 STCs (~$2,274). Installing earlier returns more certificates.
The WEM Procedure for Technical Requirements has been in force since 1 May 2026. It governs export limits, equipment compliance, and program eligibility for solar and battery installations on the SWIS.
Who is affected: All new solar installations, upgraded solar systems, new batteries, and upgraded batteries. Existing systems installed before 1 May 2026 are grandfathered and exempt from the current requirements.
Under the current framework, all new DER installations choose a customer tier. Your tier determines your export limit, program eligibility, and connectivity requirements.
No ongoing internet required
Best for: Sites with inadequate internet or customer preference for minimal grid interaction.
Emergency Solar Management
Best for: Standard installations wanting DEBS credits without full VPP participation.
Full remote management
Best for: Maximising financial benefits with battery storage. Required for WA Battery Scheme.
All new DER installations use CSIP-AUS compliant equipment (inverters/batteries on the Synergy Supported Solutions List). This enables remote communication for grid management and VPP participation.
Common Smart Inverter Profile Australia (SA HB 218:2023) is the Australian standard for remote DER management using IEEE 2030.5 (SEP2) protocol. It enables:
Important: internet is required for higher export limits
Without reliable internet or a VPP offtake agreement, systems default to 1.5 kW export limit. If internet connectivity is lost, systems revert to this fallback limit until connectivity is restored.
Under the current WA framework, grid-connected batteries follow set operational windows:
No grid charging
6:00 PM - 9:00 PM daily
Protects grid during peak demand
No grid discharging
10:00 AM - 3:00 PM daily
Prevents grid instability during solar peak
Note: These restrictions apply to grid interaction only. Solar charging and self-consumption are unaffected.
Existing systems installed before May 1, 2026 are grandfathered:
Battery policy in Western Australia covers more than the direct rebates. Grid connection rules, export limits, and Virtual Power Plant (VPP) programs all shape what a battery is worth to you.
These rules answer to grid stability and the state's renewable energy targets, with consumer protection layered on top. They decide what you can install, how it connects to the grid, and the rebates and credits you can claim.
Complete guide to federal STCs including eligibility and taper schedule
Synergy battery rebate details and VPP requirements
Calculate your rebate based on installation timing
Calculate total savings including rebates, VPP, and energy savings
Step-by-step help for actually claiming the federal and WA incentives above.
Confirm product lists, accreditation, VPP/SSL status and paperwork before you commit
Documents and identifiers your vendor or installer will ask for to claim
How federal and WA support can combine, with worked examples
Why incentive windows cause rushes and how to plan around supply
How rebates, vendor 0% WA loans and green finance fit together
See how these rebates apply to your home. The savings tool gives personalised estimates and battery recommendations.