Two federal certificate schemes sit behind most of the discount on solar and batteries in Australia. Both are on a scheduled decline, both changed in 2026, and they run on different clocks.
If someone has told you the rebate is ending, they have oversimplified. Here is what is actually happening.
Small-scale technology certificates for solar are calculated on a simple formula: system size in kW, multiplied by your zone rating, multiplied by the deeming period.
The deeming period is the number of years remaining until the Small-scale Renewable Energy Scheme closes at the end of 2030. That number drops by one every 1 January. In 2026 it is five years. In 2027 it will be four. In 2030 it will be one, and then the scheme ends.
Certificates trade at a floating price, generally around $37 to $40 each after administrative costs.
The practical effect is that the same solar system is worth roughly 20 percent less in certificates each year than it was the year before. There is no dramatic cut off. There is a steady, predictable erosion, and it happens on New Year's Day whether or not anyone announces it.
Battery certificates work differently, and they changed more significantly.
The Cheaper Home Batteries Program launched on 1 July 2025 and moved batteries from a premium upgrade to a mainstream purchase almost overnight. In December 2025 the Clean Energy Regulator confirmed the program's funding had been expanded from an original estimate of $2.3 billion to $7.2 billion over four years.
At the same time, the government confirmed that from 1 May 2026 battery certificates would become tiered and adjusted according to the size of the battery, replacing the previous flat approach. The stated objective is to hold the discount at around 30 percent of the system cost as battery prices fall, rather than letting the subsidy over-reach as hardware gets cheaper.
As at August 2026, the certificate factor sits at 6.8 STCs per kWh of usable capacity, down from 8.4. Applied against certificate prices, that works out at roughly $250 per kWh of upfront discount before tiering is applied.
The tiering then scales the entitlement by capacity:
Unlike solar, which steps down once a year, battery certificates are scheduled to reduce twice yearly, on 1 January and 1 July. The next scheduled reduction is 1 January 2027.
Read the bands again and the design intent is obvious. The full entitlement covers a typical household battery. The taper handles larger homes. Above 50 kWh, the federal program steps out entirely.
That is not an oversight. Above 50 kWh you are no longer in residential territory, and the economics change completely. A commercial site is not chasing a rebate on the purchase price. It is chasing demand charges, time of use arbitrage, and in NSW, Peak Reduction Certificates under the state scheme, which from 1 September 2026 covers commercial and industrial batteries for the first time.
So if you are a business owner reading about the federal battery rebate and wondering why the numbers look small, that is why. You are reading the wrong scheme for your site.
There is a version of this article that ends with "act now before the rebate drops". We are not going to write it, because for most sites it is not the decision that matters.
A step down in certificate value shifts a payback period by a matter of months. How the system is designed and operated shifts it by years. A battery installed against a poorly understood tariff, or run on a fixed schedule that ignores what the site actually does, will underperform a well designed system by far more than any incentive is worth.
Across Ampaura sites, AI Mode delivers at least 20 percent more savings than standard control strategies, with real world examples as high as 46 percent, measured against a documented baseline. Compare that to a certificate step down and it is not a close contest.
The incentive is a reason to get on with a decision you were going to make anyway. It is not a reason to make a decision you had not thought through.
For a home, the question is straightforward: how much of your own energy do you want to be using, and what size system gets you there before the next step down.
For a business, start with your bill and your interval data. The tariff structure tells you which of the savings levers is worth pulling, and that determines the system, not the other way around.
Try the energy independence calculator for a rough sense of scale, then talk to us about modelling your actual meter data. Home battery buyers can start with the RCT Power residential range.
Solar deeming periods and the annual 1 January reduction reflect the Small-scale Renewable Energy Scheme as legislated, closing at the end of 2030. Program funding of $7.2 billion and the move to tiered battery certificates from 1 May 2026 are as confirmed by the Clean Energy Regulator in December 2025. Certificate factors, tier bands and certificate prices are current as at August 2026 and are subject to scheduled reductions and market movement. Confirm current values before relying on them for a purchase decision.