The Federal Government’s Solar Battery Rebate introduced in 2025 has already helped more Australian households and small businesses store and utilise solar energy, and cut power bills. But from 1 May 2026, the incentive is changing. 

This guide explains what the program is and how rebates are impacted from May 2026 – especially if you are considering a larger battery system. 

What is the Cheaper Home Batteries Program? 

The Cheaper Home Batteries Program is a Federal incentive that reduces the upfront cost of eligible small-scale solar batteries. Instead of a cash rebate paid after installation, the program typically delivers value as an upfront discount through the creation and assignment of Small-scale Technology Certificates (STCs). 

The Clean Energy Regulator oversees the program through its STC frameworks. The practical discount you see depends on factors such as battery size, installation date, and how STCs are processed.  

How the rebate works: STCs in plain English 

If your battery system is eligible, it can create a certain number of STCs. Most customers assign the right to create those STCs to an agent (often via the system provider/installer), and that assignment is what enables an upfront discount on the purchase and installation price.  

Two points matter for consumers: 

• The installation date drives the STC entitlement rules that apply at that time.  

• The STC discount is not a fixed “percentage off” for every system. It varies with the scheme settings, and those settings reduce over time.  

The CER also provides battery rebate information and tools (including a calculator referenced by government guidance) to estimate STC creation for battery storage. 

What is changing from 1 May 2026? 

New rules come into effect from 1 May 2026. In short, the scheme shifts to discourage oversized batteries by reducing support for larger capacities and tapering more frequently.  

There are two major changes. 

1) The rebate reduces more frequently 

The program’s settings are structured to decrease over time through to 2030, and the revised approach introduces more frequent step-downs (every six months rather than only annual reductions).  

Why this matters: if you are planning a project with a long lead time, the difference between installing before or after a step-down can be meaningful. 

2) A tiered structure reduces support for larger batteries 

From 1 May 2026, the program applies the “STC factor” differently depending on the battery’s usable capacity. Under the government’s published settings: 

• 0–14 kWh (inclusive): STC factor applied at 100% 

• More than 14 kWh up to 28 kWh (inclusive): STC factor applied at 60% 

• More than 28 kWh up to 50 kWh (inclusive): STC factor applied at 15%  

This is progressive, meaning the first portion of capacity receives the higher rate, and only the additional capacity above each threshold receives the reduced rate.  

What battery sizes are supported? 

The program targets small-scale batteries, and government guidance focuses support on usable capacity. With the tiering applying up to 50 kWh under the revised structure from May 2026.  

If you are considering large storage for off-grid or high-consumption homes, it is worth understanding that changes to the scheme will deter households from installing oversized systems by reducing the marginal incentive on higher capacities.  

Example: why larger batteries are impacted most after May 2026 

To illustrate the effect of tiering: 

• A battery sized 10–14 kWh is mostly affected by the scheduled step-down in rates over time. 

• A battery sized 30–50 kWh is affected by both the step-down and the tiered reduction, because the capacity above 14 kWh receives progressively less support. 

That does not mean larger batteries are always “bad” or unnecessary. It just means the program will no longer reward extra capacity as generously as it did earlier, which places more emphasis on correct sizing. 

A good example is Craig and Susanne’s off-grid home in Bungendore, NSW. Where battery capacity was driven by year-round energy independence and EV charging rather than rebate optimisation. You can see how their system was designed and why those choices were made in this off-grid solar system case study. 

How to think about battery sizing (especially for off-grid and high usage) 

Battery sizing should start with outcomes, not incentives. If you are unsure how to assess battery capacity, lifespan, performance, and suitability for your home, our guide on how to choose a solar battery and what to avoid explains the key decision points in plain language. 

A few practical considerations: 

Daily energy use and overnight needs 

How much energy do you need to cover evenings, early mornings, and cloudy-day buffering? Homes with electric cooking, water heating, or EV charging can have very different load profiles. 

Understanding your daily and overnight energy use is critical when selecting a battery size. Tools like a load calculator can help estimate how much storage you need based on real consumption rather than rebate assumptions. 

Solar generation and seasonal variation 

Winter solar production can be significantly lower than summer. A battery that feels generous in summer may be tight in winter unless solar is sized appropriately. 

Backup and resilience goals 

Some households want partial backup (lights, fridge, internet), while others want full-home backup. The appropriate battery size can vary widely. 

Off-grid systems 

Off-grid households generally need storage that is engineered for autonomy, including generator integration, load management, and multi-day weather events. The right battery size is often driven by reliability requirements, not purely rebate optimisation. 

If you are new to off-grid power or want a deeper understanding of how solar, batteries, and backup systems work together, our Off-Grid Solar Essentials course explains these fundamentals in plain language. 

How do you know what rebate applies to you? 

Because the scheme is delivered through STCs, a useful rule of thumb is: 

Your installation date determines the rules and rate that apply.  

If you are planning an install that may straddle a change date (such as 1 May 2026), it is worth scheduling early and checking estimates using official guidance and calculators, as referenced by government sources.

Looking to benefit from the rebate now? Learn more about the Solar Battery Rebate and how it applies to our off-grid systems.   

Common questions 

Are the changes happening on 1 May 2026? 

Government and regulator information references changes from 1 May 2026 (subject to regulations being made), applying to systems installed from that date.  

Does the rebate still “reduce the cost by around 30%”? 

The CER states households and small businesses may be eligible for around a 30% discount, but the actual value varies and is designed to gradually decrease until 2030. It is not a guaranteed flat percentage for every battery size.  

Why introduce tiering for larger batteries? 

Public explanations have pointed to stronger-than-expected uptake of very large batteries and a desire to manage the budget and keep the program viable while aligning incentives with declining battery costs.  

Where can I verify the rules? 

The most reliable sources are the Department of Climate Change, Energy, the Environment and Water and the Clean Energy Regulator. Their program and solar battery pages include details on the tier structure and commencement date.

Note: Rebate eligibility and value depend on installation date, system configuration, and government policy, and may change over time. 

Key takeaways 

• The Federal battery incentive is delivered through STCs and commonly appears as an upfront discount.  

• From 1 May 2026, the program introduces tiering: 0–14 kWh at 100%, 14–28 kWh at 60%, 28–50 kWh at 15%.  

• The scheme’s value reduces over time, and the revised approach introduces more frequent reductions through to 2030.  

• Larger battery systems are most affected, so sizing and installation timing matter more than ever.