Important Update: Your Solar & Battery Rebate Is Changing in 2026

December 15, 2025

5 min read

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Quick Summary

A major update to Australia’s solar and battery incentives means homeowners should pay close attention to installation timing. If you book your solar or solar + battery installation before Christmas and install before May 2026, you can still secure the full Federal Battery Rebate and current STC (solar rebate) rate, maximizing upfront savings. From May 2026, the STC factor will begin decreasing twice per year, reducing the number of rebate certificates systems receive and increasing the out-of-pocket cost for the same installation. Because these reductions will occur more frequently and affect larger systems the most, installing earlier helps lock in stronger rebate value and better overall financial returns.

There’s a big update to the Federal Battery Rebate and the national solar rebate (STCs) that every homeowner should know about — and it comes with both good news and bad news.

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I’ll keep it simple.

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GOOD NEWS

If you book your solar or solar + battery installation before Christmas, you will still qualify for the full Federal Battery Rebate and the current STC rate.

Nothing changes for you — you lock in the maximum support available today.

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BAD NEWS

From May 2026, the Federal Battery Rebate and STC Program start to shift. And not in your favour.

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The government is adjusting the STC Factor, which is the multiplier used to calculate how many STCs (rebate certificates) your system receives. STCs are essentially government-backed credits that reduce the upfront cost of solar and solar + battery systems.

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The change has two major impacts:

The STC Factor will now decline twice a year (every 6 months)
It will decline at a faster rate than before

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Meaning:
Systems installed after May won’t receive the same level of rebate — especially larger systems.

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WHAT’S ACTUALLY CHANGING?

Below is the official proposed update provided by the Department of Climate Change, Energy, the Environment and Water.

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Year	Period	Existing STC Factor	Proposed STC Factor
2026	Jan–Apr	8.4	8.4
2026	May–Dec	8.4	6.8
2027	Jan–Jun	7.4	5.7
2027	Jul–Dec	7.4	5.2
2028	Jan–Jun	6.5	4.6
2028	Jul–Dec	6.5	4.1
2029	Jan–Jun	5.6	3.6
2029	Jul–Dec	5.6	3.1
2030	Jan–Jun	4.7	2.6
2030	Jul–Dec	4.7	2.1

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SO WHAT DOES THIS MEAN FOR YOU?

Here’s the simplest explanation:

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More STCs = more rebate

Fewer STCs = smaller rebate

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As the STC Factor drops:

You receive fewer STCs
Your system receives less rebate
You pay more out of pocket for the exact same system

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And because the rebate now declines twice a year instead of once, the changes happen faster and more aggressively.

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THE CRITICAL TIMING WINDOWS

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1. Before Christmas 2025

You secure access to the full Federal Battery Rebate + current STC rate.
No reductions. No surprises.

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2. Before May 2026

This is the last period where homeowners can still claim the rebate at its strong levels for larger batteries and systems before the first major cut kicks in.

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3. After May 2026

The rebate begins stepping down more sharply.
Larger systems are affected the most.

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THE BOTTOM LINE

If solar or a battery is on your radar for 2026, the smartest financial move is:

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Book before Christmas → Install before May → Lock in the full rebate

This ensures you’re getting the maximum support before the new rules reduce the value of both the solar and battery rebate programs.

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Want clarity on what your home qualifies for?

Reply to this email or click below for a no-pressure assessment.

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We’ll show you:

• What your rebate looks like today
• What changes after May
• Whether your system size is affected
• How to secure the full rebate before the step-downs begin

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This update matters — and acting early means you won’t miss out. Contact a Stag Electrical Solar and Refrigeration Australia solar expert today!

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Frequently Asked Questions

Is a bigger solar system always better?

Not necessarily. A larger system produces more energy, but if that energy isn’t being used when it’s generated, most of it gets exported for a low return. The best system isn’t the biggest one. It’s the one that aligns with how and when you actually use power.

Why isn’t my solar saving as much as I expected?

In most cases, it comes down to timing. If your energy usage is higher at night, your system isn’t offsetting much of your bill. Instead, you’re exporting power during the day and buying it back later at higher rates. Same system, different usage, very different results.

What matters more, kW or kWh?

kW tells you the size of your system. kWh tells you how much energy you actually produce and use. Your electricity bill is based on kWh, so that’s what ultimately determines your savings.

Do I need a battery to make solar worthwhile?

Not always. Solar alone can still deliver strong savings. A battery becomes valuable if you’re exporting a lot of energy during the day and using most of your power at night. It’s less about needing one and more about whether it makes financial sense for your situation.

How do I get the most out of my solar system?

It comes down to alignment. The right system size, proper panel placement, and using more electricity during the day all make a difference. Even small changes, like running appliances while your system is generating power, can noticeably improve your results.

Can two homes with the same system really get different results?

Yes, all the time. Usage patterns, shading, system design, and location all affect performance. Two identical systems on paper can deliver very different savings depending on how they’re set up and used.

About the Author

Sam is the Founder and Managing Director of Stag Electrical, Solar & Refrigeration, a trusted Australian solar company with over 18 years of industry experience. He remains actively involved in system design, installation standards, and quality oversight, ensuring every project meets Stag’s award-winning benchmarks. Sam is passionate about cutting through misinformation and helping homeowners make confident, well-informed decisions about solar and battery systems.