Most people searching for solar rebates in NSW or the ACT have heard the term "STC" thrown around without a clear explanation of what it means for their actual quote. It's not a cheque in the mail and it's not a flat percentage off — it's a certificate-based scheme with its own mechanics, and understanding those mechanics is the difference between comparing quotes properly and just trusting whatever number a salesperson writes down.
What STCs actually are
Small-scale Technology Certificates (STCs) are the mechanism behind the federal Small-scale Renewable Energy Scheme (SRES) — the main reason a new solar system in Australia costs less upfront than its sticker price. When a system is installed, it's assigned a number of certificates based on three things: the size of the system in kW, the postcode's solar "zone rating" (how much sun that region is deemed to get), and how many years remain until the scheme's legislated end date of 2030 — the "deeming period." A system installed with more years left in the scheme earns more certificates than the same system installed closer to 2030, because the certificates represent renewable energy the system is deemed to generate over its remaining eligible years, claimed upfront in one lump sum rather than paid out over time.
In practice, almost nobody deals with STCs directly. Your installer calculates the certificate value for your specific system and location, then deducts it from the system price on your quote — that's the "rebate" figure you actually see. The installer (or their agent) then sells the certificates on the STC market to recover that amount, which is why the discount shows up before you pay rather than as something you claim afterwards.
The STC discount is built into your quote automatically — you don't apply for it separately. What you should ask is how it was calculated for your specific address and system size, not just what the final number is.
What makes a system eligible
- CEC-accredited installer. The system must be designed and installed by a Clean Energy Council–accredited installer — this is non-negotiable for STC eligibility, not just a quality signal.
- CEC-approved products. Panels and inverters need to be on the CEC's approved products list. Reputable installers only quote approved gear, but it's worth confirming rather than assuming.
- System size cap. The SRES applies to small-scale systems (broadly, up to 100kW) — the size range that covers the vast majority of residential, small commercial, and acreage installs.
- Correct paperwork. The installation needs to be properly documented and submitted through the Clean Energy Regulator's process — another reason working with an accredited, established local installer matters.
Where battery incentives fit in
Battery incentive schemes exist at both the federal and state level in Australia, and — unlike the STC scheme's fairly stable mechanics — the specific programs, dollar values, and eligibility rules for batteries have changed more often and vary by state. Rather than quote a number here that may be out of date by the time you read this, we confirm exactly what applies to your address, system size, and battery capacity when we prepare your quote. If you're weighing up whether a battery is worth adding, our battery storage guide walks through the payback math using current NSW/ACT tariffs.
How rebates show up against real numbers
To make this concrete: our published on-grid pricing model (see our Canberra pricing guide for the full breakdown) works out to roughly $824 per kW of solar and $429 per kWh of battery capacity, post-STC, based on real completed jobs. Those figures already have the certificate discount baked in — it's not something added or subtracted later. On the usage side, current published tariffs for the region are around 34c/kWh in NSW (AER Default Market Offer) and 37c/kWh in the ACT (ICRC), with feed-in tariffs of roughly 5c/kWh in NSW (IPART) and 6c/kWh in the ACT (Evoenergy network) — these are what actually determine your payback period once the upfront rebate has already been applied.
Two systems of the same size can have different effective rebates depending on exactly when they're installed and which zone they fall in, which is part of why quotes from different installers for what looks like "the same system" can show different final prices even before accounting for equipment quality or installation standards.
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Common questions
Do I apply for the STC rebate myself? No — your installer handles the certificate creation and sale, and the discount is reflected directly in your quote. You never need to file separate paperwork for it.
Does the rebate get smaller every year? Broadly yes, in a stepped way, since the deeming period shortens as the scheme approaches its 2030 end date — which is part of why installing sooner rather than later generally means a larger certificate entitlement, all else being equal.
Can I lose eligibility after installation? Using a non-accredited installer or non-approved equipment can jeopardise eligibility from the outset. Once correctly installed and documented by an accredited installer with approved products, this isn't something you need to actively maintain.
Is the rebate the same for a home battery? No — battery incentives run on separate federal and state programs with their own rules, which is why we check current eligibility at quote time rather than quoting a fixed figure here.
