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Certificate Tool

Solar STC Certificate Estimate (Australia)

Estimate certificate count and an entered gross value from system size, zone rating, deeming years and certificate price.

Sources listedReviewed July 2026Our methodology

Inputs

View result
Total panel (DC) capacity being installed.
Set by your postcode (Clean Energy Regulator).
Enter the installation-year period published by the Clean Energy Regulator.
Enter the current certificate price used for this estimate.

Live result

Edit inputs

STCs created

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Entered gross value

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Key takeaways
  • Estimates the number of certificates from the values entered.
  • Uses your system size, zone rating, deeming years and the STC price as inputs.
  • Returns certificate count and gross value without presenting it as a quote.

How it works

Australia's Small-scale Renewable Energy Scheme (SRES) gives eligible solar installs a number of Small-scale Technology Certificates (STCs) created under the Small-scale Renewable Energy Scheme:

  • STCs = system kW × zone rating × deeming years, rounded down to whole certificates.
  • Zone ratingreflects your region's sunshine and is set by postcode by the Clean Energy Regulator (Zone 1 1.622 → Zone 4 1.185).
  • Deeming years count the years left in the scheme: 5 for a 2026 install, falling by one each year until the scheme ends in 2030.
  • Entered gross value = STCs × the certificate price you enter. It is not a quote or a promise of the discount passed through.

Verify eligibility, the current deeming period, postcode zone and certificate price before using the estimate. The Clean Energy Regulator entitlement page is the source of truth.

Estimates only: for guidance, not a quote or a compliance certificate. Verify against the current AS/NZS standards and a licensed design. The maths runs in your browser. Nothing is sent to Wattbench unless you sign in and deliberately save the result.

Source ledger1 source

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Frequently asked

Is this calculator free to use?
Yes. The STC estimate is free and needs no sign-up. It runs entirely in your browser.
Is my data stored or sent anywhere?
The calculation runs in your browser. Nothing is sent to Wattbench unless you sign in and deliberately select Save result.
Is the gross value a quoted rebate?
No. It is the estimated certificate count multiplied by the price entered. Eligibility, fees and the amount passed through must be confirmed for the actual installation.
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