Dropping STCs and the Cheaper Home Battery Rebate: What Homeowners Need to Know

Small-scale Technology Certificates (STCs) for rooftop solar are shrinking every year, while the federal Cheaper Home Batteries Program is cutting the upfront price of home batteries through STC-based discounts that also step down over time. For households in NSW, the NSW solar battery rebate landscape now combines the federal discount with state-level programs, so the cheapest time to install is usually sooner rather than later. At Polygon Energy, we help homeowners work out the right timing and system size before incentives drop further.

What are STCs, and why are they dropping?

STCs are federal certificates created when you install an eligible rooftop solar system. Your installer typically claims them on your behalf and deducts their value from your upfront price. Under the Renewable Energy Target, the number of STCs a system earns falls each year: the “deeming period” shortens by one year every January 1, until the scheme winds down in 2030. A system installed in 2026 therefore earns fewer certificates than the same system installed in 2025, and the gap widens every year.

How does the Cheaper Home Batteries Program work?

Since 1 July 2025, eligible home batteries (generally 5 kWh to 100 kWh of usable capacity, connected to rooftop solar) can earn STCs as well. The discount is applied upfront by an approved installer, so you don’t wait for a cheque. Three details matter:

  • The discount declines over time. The STC factor for batteries is scheduled to step down, so waiting means a smaller discount.
  • Capacity tiers apply. Recent changes taper the discount for larger batteries, so oversizing no longer pays off the way it once did.
  • Eligibility is strict. The battery must be on the Clean Energy Council’s approved list and installed by an accredited installer.

Because these settings have been adjusted since launch, always confirm current figures with your installer or the Clean Energy Regulator before you sign.

How do NSW incentives fit in?

NSW households can often combine the federal STC-based discount with state-level incentives, such as those delivered through the Peak Demand Reduction Scheme. Together, the NSW solar battery rebate options can take a large slice off the sticker price of a battery. Programs and rates change, so we recommend checking the current rules at the time of purchase.

Is a battery still worth it as incentives fall?

For most households, yes, provided the system is sized to your actual usage. A battery pays back through three channels:

  1. Using stored solar in the evening instead of buying grid power at peak rates
  2. Backup power during outages
  3. Participation in virtual power plant (VPP) programs that pay you for exporting at peak times

As the NSW solar battery rebate and federal discounts shrink, careful sizing matters more. A 10 kWh battery matched to a family’s evening load often outperforms an oversized unit with a thinner discount.

Real-world example: a 23.6 kW solar and battery system

Polygon Energy’s case study “23.6 kW Solar with Battery Near-Zero Electricity Bills” shows what a well-sized system can do. The household paired a 23.6 kW solar array with home battery storage, and the result was near-zero electricity bills.

  • Location: [suburb/region, ACT or NSW]
  • System: 23.6 kW solar + [battery brand and capacity]
  • Before: [average quarterly or annual bill]
  • After: [new bill and % reduction]
  • Payback: [years, if stated]
  • Incentives applied: [e.g. STC discount, any ACT or NSW program]

The takeaway is that the battery shifts daytime solar into the evening peak, which is where most of the savings come from. Read the full project on the Polygon Energy case studies page.

What about Canberra and the ACT?

Canberra households sit in the ACT, not NSW, so state-level NSW incentives don’t apply to them. They can still claim the federal STC-based battery discount, and the ACT Sustainable Household Scheme has offered zero-interest loans to help finance batteries and solar. Many homes in Queanbeyan, Yass and the surrounding region sit just over the border, so the right program depends on your exact address. A local solar expert in Canberra will know which rules apply to you.

How do you choose the right installer?

Look for these markers:

  • Clean Energy Council accreditation
  • Clear quotes that show the STC discount as a separate line item
  • Transparent battery brands and warranty terms
  • Local service, so warranty work doesn’t mean waiting weeks

A trusted solar expert in Canberra will also size the system to your usage, rather than selling the biggest battery available.

Frequently asked questions

Can I get STCs for both solar and a battery?

Yes. Solar panels and an eligible battery each earn STCs, and both are usually applied as upfront discounts.

 

Will the battery rebate be bigger next year?

No. The scheduled direction is downward, so the discount is expected to shrink at each step-down.

 

Do I need new solar to claim the battery discount?

Not necessarily. An eligible battery can be added to an existing solar system, provided the installation meets program rules.

 

Who should I speak to first?

Start with an accredited local installer. As a solar expert in Canberra, Polygon Energy can check your eligibility, compare current incentives and give you a clear quote.

 

With STCs dropping each year and the battery discount stepping down on a schedule, delay usually costs money. Whether you’re relying on the NSW solar battery rebate or the ACT’s loan scheme, the best next step is a tailored quote from a solar expert in Canberra who can match the system to your home and your bills. Polygon Energy is ready to help you lock in today’s incentives before the next step-down.

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