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Understanding 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 reduces twice per year (H1 and H2). Acting sooner means larger rebates. 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 provides upfront rebates for solar panels through STCs. In 2026: 8.4 STCs per kW at ~$39.9 each. Continues reducing annually 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
Beyond upfront rebates, Synergy's Battery Rewards program provides ongoing credits when your battery participates in Virtual Power Plant (VPP) events. This is separate from and in addition to state rebates and federal STCs.
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)
The good news: you can stack federal Battery STCs and the WA state rebate together. For a typical 10kWh battery system at the current 6.8× STC factor (May–Dec 2026), this means roughly $4,000 in combined savings for Synergy customers.
Important distinction: Solar Panel STCs are separate from Battery STCs. If you're adding a battery to an existing solar system, you'll receive Battery STCs for the battery. If you're installing a new solar + battery system together, you'll receive 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.
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Our calculator shows you exactly what you'll save with current 2026 rates
Federal STCs now change biannually. 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). Each delay costs hundreds in lost rebates.
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: Maximizing 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 is evolving rapidly. Beyond direct rebates, understanding the broader policy landscape—including grid connection rules, export limits, and virtual power plant (VPP) programs—is crucial for maximizing your battery investment.
The state government's approach to battery storage is shaped by grid stability needs, renewable energy targets, and consumer protection frameworks. These policies directly impact what systems you can install, how they connect to the grid, and what financial benefits you can access.
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
Now you know the rebates available, see how they apply to your home with personalised savings estimates and battery recommendations.