Australian households and businesses considering rooftop solar installations will now receive a significantly larger upfront discount, following a key policy adjustment by the Clean Energy Regulator (CER). Effective August 12, 2026, the deeming period for Small-scale Technology Certificates (STCs) has been extended, directly increasing the value of the federal rebate. This change means a typical 6.6kW solar system could now attract an additional AUD$750 or more in upfront savings.
The CER’s decision to extend the deeming period from 10 years to 12 years for eligible solar PV systems up to 100kW is a substantial boost for the renewable energy sector. It aims to accelerate the adoption of rooftop solar across the country, providing a more attractive financial incentive at the point of purchase.
Understanding Small-scale Technology Certificates (STCs)
STCs are electronic certificates generated under the Small-scale Renewable Energy Scheme (SRES). They are a core component of Australia’s federal solar rebate system. When you install an eligible solar power system, you are entitled to a certain number of STCs, which are then typically assigned to your solar installer in exchange for an upfront discount on the system’s purchase price. The number of STCs a system generates depends on its size (kW), its geographical location (solar zone), and its deeming period.
Previously, for systems installed from 2023 onwards, the deeming period was set at 10 years. This meant that the system was deemed to generate renewable energy for 10 years into the future, and STCs were calculated based on this timeframe. The recent change by the CER extends this period to 12 years, immediately increasing the number of certificates generated by each new installation.
“The extension of the STC deeming period reflects the increasing longevity and efficiency of modern solar PV technology,” stated a CER spokesperson. “This adjustment provides a tangible financial benefit to consumers, making solar more accessible and helping Australia meet its renewable energy targets more rapidly.”
Direct Financial Impact for Australian Solar Buyers
This policy shift translates directly into greater savings for consumers. Let’s examine the impact on common system sizes:
| System Size (kW) | Old Deeming Period (STCs, approx.) | New Deeming Period (STCs, approx.) | Additional STCs | Additional Rebate (AUD$, @$38/STC) |
|---|---|---|---|---|
| 6.6kW | 99 (6.6 x 10 x 1.5) | 118.8 (6.6 x 12 x 1.5) | 19.8 | $752.40 |
| 10kW | 150 (10 x 10 x 1.5) | 180 (10 x 12 x 1.5) | 30 | $1,140.00 |
| 13.3kW | 199.5 (13.3 x 10 x 1.5) | 239.4 (13.3 x 12 x 1.5) | 39.9 | $1,516.20 |
Calculations based on Zone 3 (e.g., Sydney, Melbourne, Brisbane) and an indicative STC market price of AUD$38. Actual STC prices fluctuate daily on an open market.
As the table illustrates, a standard 6.6kW system, popular for many Australian homes, will now generate nearly 20 additional STCs. At a current STC market price of approximately AUD$38, this equates to an extra AUD$752.40 off the upfront cost. For larger 10kW systems, often installed by small businesses or homes with higher energy demands, the additional savings could exceed AUD$1,100.
This increased incentive comes at a crucial time, as Australians continue to seek ways to mitigate rising electricity costs and enhance energy independence. The extended deeming period effectively lowers the barrier to entry for solar adoption, making the initial investment more palatable.
What This Means for Your Solar Installation
If you are currently considering installing solar, this change provides a compelling reason to proceed. The increased federal rebate will be automatically applied by your solar installer, as they are the ones who typically manage the STC creation and redemption process. It’s important to obtain detailed quotes that clearly outline the STC discount.
This federal incentive complements existing state-based rebates and loan schemes, such as those offered in Victoria or New South Wales, further reducing the net cost of a solar power system. For a comprehensive understanding of what to expect, refer to our guide on Solar System Installation Costs in Australia 2026: A Complete Guide.
Homeowners and businesses are encouraged to consult with reputable Clean Energy Council (CEC) accredited installers to understand the full scope of available incentives and to ensure their system is designed for optimal performance and maximum STC eligibility. For those looking at typical system sizes, our analysis on 6.6kW Solar & 10kWh Battery Cost Australia 2026: Full Payback Analysis provides further insights into potential returns.
The CER’s move underscores the Australian government’s ongoing commitment to fostering renewable energy growth and supporting consumers in their transition to cleaner, more affordable power. This week’s announcement is a clear signal that the financial benefits of going solar are becoming even more attractive.