Australia’s Clean Energy Regulator expects around 24.1 million Small-scale Technology Certificates (STCs) to be created in 2026 alone, a sign of how central this scheme is to household solar. If you’re comparing quotes and want the STC value explained Australia-wide, you’re not alone; most homeowners assume it’s a rebate cheque, when it’s really a point-of-sale discount built into the invoice.
Every STC represents one megawatt hour of renewable electricity your system will generate or displace, calculated from your postcode zone and a deeming period that shrinks each year as the scheme winds toward its 2030 end date. Understanding how STC value works in Australia helps you read solar quotes with confidence and avoid overpaying. This guide breaks down zones, deeming periods, current pricing and how to claim your discount.
What does STC value mean in Australia’s solar market?
An STC (Small-scale Technology Certificate) is a tradable unit created when you install an eligible rooftop solar, solar hot water, or heat pump system. Each certificate equals one megawatt hour of renewable electricity your system is expected to generate or displace over its deeming period.
Your accredited installer calculates your entitlement, claims the certificates on your behalf, and subtracts their dollar value from your quote before you sign anything. That’s the core of how STC value works in Australia; it’s already built into the price you’re comparing, not a separate cheque that arrives later.
The scheme sits within the Small-scale Renewable Energy Scheme (SRES), administered by the Clean Energy Regulator (CER), and has operated since 2011 as part of Australia’s broader Renewable Energy Target.
Expert tip
Always ask your installer to itemise the STC discount separately on the quote. A transparent breakdown makes it easy to compare offers and confirms the STC value explained Australia-wide has genuinely been passed on to you.
How do STC zones affect your certificate numbers?
Australia is split into four STC zones based on postcode, reflecting average solar irradiance in that area. A larger zone rating means more certificates for the same system size, because that location is expected to generate more usable solar energy over the deeming period.
- Zone 1: Darwin and far north QLD/WA (the highest zone rating)
- Zone 2: Brisbane, Perth and coastal QLD/WA (a high rating)
- Zone 3: Sydney, Melbourne, Adelaide and Canberra (where most Australians live)
- Zone 4: Hobart and parts of southern Victoria (the lowest rating)
Expert tip
Two identical solar systems installed in Darwin and Hobart won’t earn the same number of STCs. Check your postcode against the CER’s official zone map before comparing quotes from installers in different states.
What determines the STC value for your system?
Four factors combine to set your final STC value: system size in kilowatts, your zone rating, the current deeming period (five years for systems installed in 2026), and the market price on the day your certificates are traded.
STCs can be sold on the open market or through the CER’s STC Clearing House at a fixed price of $40 (excluding GST). Open-market spot prices sat in the high-$30 range through early 2026, so most quotes use a price a little under $40 per certificate.
Figures below are indicative only — your exact entitlement depends on your postcode, product eligibility and the date of installation, so always confirm the final number with your installer or the CER’s online calculator.
| STC zone | Example locations | Relative zone rating | 6.6kW system — approx. STCs (2026) |
| Zone 1 | Darwin, far north QLD & WA | Highest | 70–75 |
| Zone 2 | Brisbane, Perth, coastal QLD/WA | High | 65–70 |
| Zone 3 | Sydney, Melbourne, Adelaide, Canberra | Moderate | 45–70* |
| Zone 4 | Hobart, southern VIC | Lowest | 40–50 |
*Published estimates for Zone 3 systems vary by calculator and installation date; treat the range as a guide rather than a fixed figure.
Expert tip
A bigger system doesn’t always mean proportionally more STC value. Because the discount is capped by the deeming period and zone rating, ask your installer for the exact certificate count for your specific quote rather than assuming a simple per-kW multiplier.
How do you claim your STC value in Australia
For most households, claiming the discount is simple because the installer manages the entire process on your behalf.
- Choose a Solar Accreditation Australia (SAA)-accredited installer and Clean Energy Council (CEC)-approved solar products.
- Sign an STC assignment form authorising your installer to create and claim the certificates for your system.
- Your installer lodges the claim with the Clean Energy Regulator once installation is complete.
- The STC discount is deducted from your invoice upfront — there is no separate rebate application to lodge.
- The installer (or their agent) sells the certificates on the open market or through the STC Clearing House.
Expert tip
You can choose to keep your own STCs and sell them independently instead of assigning them to your installer, but most homeowners find the upfront point-of-sale discount simpler than managing certificate trading themselves.
Why does STC value keep shrinking each year?
The scheme is legislated to phase out by 31 December 2030, so the deeming period, and with it the number of certificates a new system earns, reduces roughly every 12 months. The small-scale technology percentage, which sets how many STCs liable energy retailers must surrender, is set at 11.67% for 2026 and is forecast to keep falling.
In practical terms, this means installing sooner rather than later generally locks in a larger STC value in Australia today rather than a smaller one in future years.
Frequently asked questions about STC value in Australia
What is the current STC value in Australia
STCs traded at roughly $37–$40 each through early-to-mid 2026, with a fixed $40 (excluding GST) available through the Clean Energy Regulator’s Clearing House. Your total STC value depends on how many certificates your system earns, based on its size, zone and deeming period.
Do I get paid directly for STCs?
Usually not. Most homeowners assign their STCs to their installer in exchange for an upfront discount on the solar quote, rather than receiving a separate payment. You can keep and sell your own certificates, but it takes more time and paperwork.
How many STCs will my solar system earn?
It depends on your system’s size in kilowatts, your postcode zone rating and the current deeming period. A typical 6.6kW system in a capital city earns somewhere in the range of 45–70 STCs in 2026 — ask your installer for your exact figure.
When does the STC scheme end?
The Small-scale Renewable Energy Scheme is legislated to wind down to zero by the end of 2030. The deeming period and available STC value reduce each year gradually until then, rather than ending abruptly.
Does the STC scheme cover home batteries?
Yes, since the Cheaper Home Batteries Program changes in 2026, eligible battery installations can also create STCs, calculated per usable kilowatt-hour of storage rather than a deeming period. Standalone batteries added to existing solar systems are commonly eligible.
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Key takeaways for Australian EV drivers
- The STC value explained Australia-wide comes down to system size, postcode zone, deeming period and the market price on the day.
- STCs are usually a point-of-sale discount deducted from your quote, not a rebate cheque you apply for separately.
- Australia is divided into four STC zones, with northern postcodes earning more certificates per kW than southern ones.
- The scheme phases out by the end of 2030, so both the deeming period and STC value shrink most years.
- Always ask your installer for an itemised STC breakdown and confirm figures against the Clean Energy Regulator’s official calculator.
Understanding the STC value Australia-wide comes down to four inputs (size, zone, deeming period and price) and asking your installer to show the working. Because that discount shrinks a little each year on the way to the scheme’s 2030 close, installing sooner generally protects a larger saving than waiting.
The clearest way to know your own number is an itemised quote from an accredited installer. Energy Matters has helped thousands of Australian households turn this certificate scheme into real, upfront savings on solar. Get a free, no-obligation solar quote and see exactly what your STC value is worth.
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Understanding the STC value explained Australia guidelines empowers you to make smarter renewable energy investments. Don’t let annual deeming rate reductions increase your system costs.
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