The May 2026 federal Budget did not announce a new rooftop solar or home battery rebate. What it did, as reported by industry commentators at the time, was fund the programs already running, add money for oversight and cut uncommitted funding from other clean energy programs. For anyone planning installs, quotes or cash flow, the dates that matter were already set before the Budget, and they have not moved.
This page separates what the Budget did from what the law already does, because the two get mixed up in sales conversations. Budget detail is as reported and may be revised, so check the relevant department’s page before you act on any figure.
What the Budget reportedly did
| Area | As reported |
|---|---|
| Cheaper Home Batteries Program | Continued. Reports cited more than 370,000 batteries installed since 1 July 2025 and more than 10 GWh of new capacity |
| Battery inspections | About $14.6 million over five years from 2025-26 to maintain proportionate inspections of battery installations |
| Consumer energy resources | About $97.2 million to set up a national technical regulator for consumer energy resources such as solar, batteries and EV chargers |
| New household rebates | None of significance announced for rooftop solar or batteries |
| Savings | About $1.3 billion from uncommitted funding in Hydrogen Headstart, Solar Sunshot and the Battery Breakthrough Initiative |
Coverage from law firms and energy publications read the Budget as continuity: government framing around two million households with a battery by 2030 and more than four million with rooftop solar already. The expanded Cheaper Home Batteries Program budget of $7.2bn, up from $2.3bn, is also reported and was in place before the Budget.
None of that touches the certificates on your next job, so here is what does.
What was already in the law
Battery STCs
The Cheaper Home Batteries Program creates STCs for batteries of 5 to 100 kWh usable capacity, with up to 50 kWh counted. Since 1 May 2026, the first 14 kWh counts at 100% of the factor, 14 to 28 kWh at 60% and 28 to 50 kWh at 15%. The factor is 6.8 at the time of writing, stepping down every six months to 5.7 on 1 January 2027 and 5.2 on 1 July 2027. A 13.5 kWh battery creates 91 STCs now, 76 in the first half of 2027. See the tier explainer and should you buy before 1 January.
Rooftop solar deeming
The deeming period is five years for 2026 installs and four for 2027, falling to one in 2030, with the scheme ending on 31 December 2030. A 6.6 kW system in zone 3 loses 9 STCs, about $342 at $38, on 1 January. See the deeming guide to 2030.
Mid-scale solar
From 1 October 2026, solar PV above 100 kW and up to 1 MW can create STCs under the Small-scale Renewable Energy Scheme, with a fixed five-year deeming period, under the amended Renewable Energy (Electricity) Regulations. The CER says applications open mid to late November 2026. Systems above 1 MW remain in the large-scale scheme. This is the biggest scheme change of the year for commercial installers, and it came from the regulations, not the Budget. The pillar page is mid-scale solar STCs, and the 1 MW guide covers the detail.
Inspections and photos
The Budget money for inspections fits a trend already visible in 2026: from 1 March 2026 batteries need geotagged, timestamped photos of compliant labelling, and the regulator reported using AI-assisted image analysis. See the battery photo checklist.
A timeline that matters more than the Budget
| Date | What changes |
|---|---|
| 1 March 2026 | New battery photo evidence rules |
| 1 May 2026 | Battery tiers (100%, 60%, 15%) |
| 1 July 2026 | Solar Victoria household income cap falls to $150,000 |
| 1 September 2026 | NSW commercial battery incentive, as reported |
| 1 October 2026 | Mid-scale solar (100 kW to 1 MW) can create STCs |
| Mid to late November 2026 | CER expects mid-scale STC applications to open |
| 1 January 2027 | Battery factor 5.7; solar deeming drops to four years |
| 1 July 2027 | Battery factor 5.2 |
| 31 December 2030 | Small-scale scheme ends |
What the “no new rebate” outcome means for pricing
Without a new incentive, the household discount keeps shrinking on a known path. For a typical installer, that means the story for customers is timing and fit. A 6.6 kW system in zone 3 earns $1,710 in 2026 and $1,368 in 2027 at $38. A 13.5 kWh battery earns $3,458 now and $2,888 in the first half of next year. The gap per job is a few hundred dollars. It is large enough to shape a December rush and small enough that a bad install is a worse outcome than a delay.
For businesses, the mid-scale change is much larger. A 250 kW system in zone 3 earns 250 x 1.382 x 5 = 1,727 STCs, roughly $65,600 at $38. Press coverage cited an estimated discount of about 20% of upfront cost for these systems.
What to watch next
- Mid-scale applications. The CER’s portal opening in mid to late November.
- The next STP and factor settings. Retailer obligations and certificate supply affect the price.
- State programs. NSW and WA move more often than the federal one. See which states still have a battery rebate.
- Inspection results. More enforcement means more value in clean evidence. See the compliance guide.
For the full list of scheme changes, see STC scheme changes.
For installers: three actions
- Plan December and January on the dates above, not on Budget headlines.
- Prepare a mid-scale offer for commercial customers and confirm your trader can handle a claim worth tens of thousands of dollars.
- Hold evidence to the new standard on every battery. Inspection funding is the Budget item most likely to affect you.
Energy Merchants publishes the daily rate on pricing and explains the settlement flow on how it works.
How to talk to customers about the Budget
Customers hear headlines, not scheme rules. A few lines keep the conversation straight.
- “The Budget did not add a new rebate. The discount you are quoted comes from the certificate schemes, which already have set dates.”
- “The battery discount is based on the install date. It falls on 1 January and again on 1 July, so we have written the date into your quote.”
- “For a business, the change that matters is that systems above 100 kW and up to 1 MW can claim certificates from 1 October. That was a regulation change, and applications open mid to late November.”
Keep a copy of the scheme page you relied on with the date you checked it. If a customer cites a rebate they saw online, ask for the source, then look it up. The answers pages on the federal battery rebate in 2026 and the rebate drop on 1 January 2027 are written to be shared with customers.
What to do next
- Re-run your next three quotes at the 1 January 2027 figures with the STC calculator and battery STC calculator.
- Read what an STC is worth in 2026.
- If you quote commercial roofs, start a mid-scale price list this week.
- When you want claims pre-checked and paid quickly, start trading.