How the STC Rebate Actually Works in 2026 (Sydney Homeowner Guide)

If you’ve been quoted for solar and seen “STC rebate” knocked off the price, you’re not alone in wondering what that actually means. Here’s the plain-English version.

What is an STC?
A Small-scale Technology Certificate (STC) is created for every megawatt-hour of renewable electricity your solar system is expected to generate over its lifetime (capped at a set number of years under the federal scheme). Installers calculate this using your postcode’s solar “zone rating” and your system size.

How it becomes a discount
Rather than you claiming the rebate yourself later, your installer typically buys the STCs from you upfront, in the form of a discount on your installation price. That’s the number you see reduced off the quote — it isn’t a government cheque you wait months for.

Why the rebate shrinks every year
The scheme is designed to phase out gradually — the multiplier used in the STC calculation steps down each January until the scheme ends in 2030. That means a system installed today attracts a bigger discount than the same system installed in two or three years’ time. If you’re on the fence, the rebate is only getting smaller from here.

What affects your STC value
– System size (larger systems generate more STCs)
– Your location (Sydney sits in a specific solar zone rating)
– The STC spot price on the day of installation, which fluctuates with market supply and demand

What to check on your quote
Make sure the STC discount is itemised separately from any other rebates or promotions, and confirm your installer is CEC-accredited — this is a requirement for the STC discount to be valid at all.

Thinking about solar or a battery add-on? Get in touch with the Superb Solar team for a quote that shows the STC discount clearly broken out.