Australian households and businesses installed a record 442 MW of rooftop solar in April 2026, marking the strongest month in the history of Small-scale Technology Certificate (STC) registrations. This unprecedented surge, representing a 31% increase from March and nearly double the capacity installed in April 2025, was largely a direct response to impending changes to the federal government’s Cheaper Home Batteries Program, which came into effect on 1 May 2026.
According to new data from solar and storage market analyst SunWiz, the national average system size also increased to 11.35 kW, indicating a clear trend towards larger installations. This pre-emptive rush by consumers highlights the significant influence of government incentives on the pace of renewable energy uptake.
The Driving Force: May 1st Rebate Adjustments
The federal government’s Cheaper Home Batteries Program, designed to support the installation of small-scale battery energy storage systems, underwent significant adjustments from 1 May 2026. Prior to this date, the program offered a discount of approximately 30% on the upfront cost of eligible battery systems. From May 1, 2026, the rebate structure changed to a tiered system based on usable battery capacity.
Specifically, the STC factor, which determines the rebate value, dropped from 8.4 STCs per usable kWh to 6.8 STCs per usable kWh. This represented a nearly 20% reduction in the discount per kWh. Furthermore, the rebate now tapers for larger battery systems:
| Usable Capacity Range |
|---|
| 0–14 kWh |
| 14–28 kWh |
| 28–50 kWh |
| STC Factor Application |
|---|
| 100% |
| 60% |
| 15% |
“The rebate cut sent households scrambling for large-format (40–50 kWh) batteries, and the bigger solar arrays needed to run them followed, turning the Cheaper Home Battery Program into a multiplier well beyond its original scope.”
This impending reduction incentivised many homeowners to accelerate their solar and battery installations in April to secure the higher rebate rates. The federal battery rebate is expected to continue until 2030, but its value will gradually decrease every six months, with further reductions scheduled for January 2027 and every six months thereafter.
State-by-State Growth and Larger Systems
The surge in April was observed across all states and territories. New South Wales recorded 143 MW of new capacity, a 35% increase from the previous month. The Australian Capital Territory saw a 62% increase, while Queensland delivered a 36% month-on-month increase.
This growth wasn’t just in volume; it was also in system size. The 20-30 kW segment notably almost doubled its installed capacity compared to March (up 98%), and the 15-20 kW segment increased by 61%. This shift towards larger systems reflects homeowners’ desire to maximise self-consumption and energy independence, especially when paired with battery storage.
For homeowners considering a solar system upgrade or a new installation, understanding these market dynamics and rebate changes is crucial. While the highest federal battery rebate rates have passed, significant incentives still exist. For a typical 14 kWh home battery, the rebate prior to May 1st was approximately AUD$4,200–AUD$4,350. After May 1st, it is approximately AUD$252 per usable kWh for the first 14 kWh.
Implications for Australian Households
The record installation figures demonstrate a strong consumer appetite for solar energy, particularly when supported by clear financial incentives. The market’s reaction to the May 1st rebate changes underscores the importance of staying informed about policy shifts if you are considering investing in renewable energy solutions.
For those who missed the pre-May 1st window, installing a solar system with a battery remains a sound financial decision, particularly given ongoing electricity price volatility. The average cost for a solar and battery system, after rebates and cashback offers, is currently under AUD$17,000, with break-even periods potentially realised within a few years.
Choosing the right system size and understanding how to maximise your investment is paramount. You can find comprehensive guidance on this in our article: Your 2026 Guide: Precisely Sizing a Home Battery for Your Solar System & Usage. Furthermore, exploring Virtual Power Plant (VPP) programs can add another layer of savings by allowing you to earn credits for sharing your stored energy with the grid. Learn more about these opportunities here: Unlock $1,000+ Annually: Best Home Battery VPP Programs in Australia 2026 Ranked.
While the market saw a temporary boost from homeowners rushing to beat the rebate changes, the long-term trend for solar and battery adoption in Australia remains positive. The federal government has committed an estimated AUD$7.2 billion to the Cheaper Home Batteries Program over the next four years, aiming for over 2 million Australians to install a battery by 2030.
This ongoing support, combined with falling technology costs and rising electricity prices, continues to make solar and battery storage an attractive proposition for households looking to reduce their energy bills and contribute to Australia’s clean energy transition. For a broader understanding of how current market conditions affect costs, refer to: Are Australian Solar Panel Prices Rising in 2026? What Homeowners Need to Know About Costs and Rebate Changes.