If you’re planning a new solar system in 2025, the biggest upfront saving is through the federal STC rebate. STCs (Small-scale Technology Certificates) are created when you install an eligible small solar PV system, and their value is usually applied directly as a discount on your invoice by your installer. This means you don’t wait for a cheque—the savings are reflected in your quote immediately.
At Opera Solar Energy, we make the process simple. We help Sydney homeowners and businesses understand how STCs work, estimate your rebate, and ensure you maximise your savings without compromising quality.
Understanding STCs and How They Work
The STC market exists because electricity retailers are legally required to buy a set number of certificates each year. This creates real value for your STCs, turning them into a practical, point-of-sale discount on your solar system. For 2025, the Small-scale Technology Percentage (STP) has been set at 13.89%, consistent with regulatory guidelines.
There are two ways STCs change hands:
Open market: price fluctuates based on supply and demand
STC Clearing House: fixed $40 per certificate (ex GST) when available
How Your 2025 STC Rebate Is Calculated in Sydney
The number of STCs depends on:
System size (kW)
Postcode zone rating (captures how sunny your area is)
Deeming period (years remaining until the scheme ends in 2030)
Sydney falls in Zone 3, with a zone rating of 1.382. In 2025, the deeming period is 6 years.
Example: A 6.6 kW system in Sydney (Zone 3)
STCs ≈ 6.6 × 1.382 × 6 = 54 STCs → up to ~$2,160 discount (at $40 per STC, ex GST)
This discount makes switching to solar one of the most cost-effective home upgrades you can make in 2025.
What Changed in 2025?
The deeming period fell from 7 to 6 years, slightly reducing STC counts compared to previous years.
Home batteries now generate STCs under the Cheaper Home Batteries Program (from 1 July 2025), offering roughly 30% off eligible batteries at checkout.
Maximising Your STC Savings
Confirm your postcode zone and system size with your solar installer in Sydney
Consider installation timing—installing before 1 January can attract more STCs
Choose high-quality panels and CEC-listed inverters
Ensure your installer is SAA-accredited and eligible for the rebate
Why Choose Opera Solar Energy in Sydney?
Certified and experienced solar installation team
Guidance to claim solar rebates in Sydney
Customised solar solutions for residential and commercial properties
Transparent quotes showing STC count and unit price
Ongoing maintenance and support
In 2025, a typical Sydney system can generate 54–82 STCs, translating to thousands of dollars in upfront savings. Pair this with eligible batteries, and you can significantly reduce your energy bills while embracing a sustainable lifestyle.
Get Your Free Quote Today and see how Opera Solar Energy can help you maximise savings, claim rebates, and switch to clean, efficient solar System in Sydney.
