The Clean Energy Regulator issued a record 5.5 million Australian Carbon Credit Units in the March quarter of 2026. Sixty per cent of the vegetation units in that quarter came from a single method, and that method is now closed to new projects. This is the part most explanations of ACCU meaning skip. Every ACCU is one tonne of carbon dioxide equivalent, and the method behind it decides what it is worth to a buyer. Short answers first, then the method underneath them.
Quick answers
What does ACCU mean, and what is the full form of ACCU?
ACCU stands for Australian Carbon Credit Unit. It is the carbon credit issued by the Clean Energy Regulator (CER) under Australia’s ACCU Scheme.
What is an ACCU carbon credit?
One ACCU represents one tonne of carbon dioxide equivalent (tCO2-e) that a registered Australian project has either stored or kept out of the atmosphere. The abatement is measured under a methodology determination made by the Australian Government, and audited before units are issued.
How does an ACCU work?
A project registers against an approved method, runs the activity the method allows, reports its abatement, and is issued one ACCU for every verified tonne. The units land in the holder’s account in the Unit and Certificate Registry. From there they can be held, sold, or surrendered. Surrendering an ACCU cancels it permanently and applies the tonne to the holder’s obligation or claim.
What are ACCUs used for?
Two main uses. Facilities covered by the Safeguard Mechanism surrender ACCUs to bring net emissions back under a declining baseline. Organisations outside the scheme cancel ACCUs voluntarily to back a carbon neutral or emissions reduction claim. Compliance demand is the larger of the two by a wide margin.
What is the difference between an ACCU and an SMC?
An ACCU comes from a project that created abatement under a method. A Safeguard Mechanism Credit (SMC) comes from a Safeguard facility that finished the year below its own baseline. Both are one tonne and both can be surrendered for Safeguard compliance, but an ACCU carries a method label and an SMC does not. There is a full comparison further down.
The rest of this article covers the part that decides what an ACCU is actually worth to a buyer: the method underneath it.
Most pages answering the question of ACCU meaning stop at the tonne. One ACCU, one tonne, issued by the regulator, surrendered against a liability. All of it is accurate, and all of it leaves out the fact that does the most work in a purchase decision: which method produced the unit.
The method is the reason the unit exists
An ACCU Scheme method is a determination that sets which activities count, how abatement has to be measured, and what the project must monitor, record and report. A project can only register against a method, and can only earn units by running in accordance with it. The method is not metadata bolted onto the unit afterwards.
Two families are worth separating early. Sequestration methods store carbon in soil or vegetation, and every vegetation project carries permanence obligations because stored carbon can be released again by fire, drought or clearing. Emissions avoidance methods stop a gas reaching the atmosphere at all, and there is nothing left to reverse. That single distinction changes how a buyer prices delivery and reversal risk before anything else is considered.
Eleven methods are open to new projects in 2026
As at 26 June 2026, the CER lists eleven open methods across five categories.
| Category | Method | What the project does |
| Agriculture | Animal effluent management | Runs animal waste through an eligible treatment facility for recycling and reuse |
| Agriculture | Estimating soil organic carbon sequestration using measurement and models | Proves through sampling and modelling that soil carbon has risen above a measured baseline |
| Energy efficiency | Industrial and commercial emissions reduction | Cuts emissions at an industrial or commercial site through efficiency work |
| Energy efficiency | Industrial equipment upgrades | Replaces or upgrades heating and cooling plant |
| Landfill and waste | Reducing methane emissions from landfill gas 2025 | Captures gas from a landfill and either burns off the methane or refines the biogas into biomethane for use in place of natural gas |
| Mining, oil and gas | Carbon capture and storage | Puts emissions from oil and gas operations underground for permanent storage |
| Vegetation | Reforestation by environmental or mallee plantings FullCAM 2024 | Plants trees on cleared land and earns units as they grow |
| Vegetation | Plantation forestry | Sets up a plantation, or converts or transitions land into one |
| Vegetation | Savanna fire management | Uses planned burning in northern Australia to cut fire emissions |
| Vegetation | Improved forest management in multiple-use public native forests | Stops timber harvesting in public native forests so the emissions never occur |
| Vegetation | Tidal restoration of blue carbon ecosystems | Lets tidal water back into a coastal wetland so it stores carbon again |
The set moves. On 10 April 2026 the Australian Government made two new savanna fire management methods. The CER expects credited abatement under the new method to run higher on average than under the earlier savanna calculators, because sequestration in additional carbon pools is now credited. One of the two includes a sequestration bank that smooths issuance across a project’s crediting period rather than delivering it in lumps.
The registry is full of units from a method you cannot register
Human-induced regeneration is closed. It still produced 60% of a record vegetation quarter in Q1 2026, with environmental plantings supplying 29%, and the CER attributes that plantings to a handful of large projects claiming abatement across multiple years alongside several projects reporting for the first time. Registrations tell the same story from the other end. Sixty-nine ACCU Scheme projects were registered in Q1 2026, down from 90 in the same quarter a year earlier.
So the method mix of units already issued describes the last decade. It says very little about what will be available to buy in 2030. A procurement plan built off the historical issuance chart is reading the wrong chart.
One market price hides the method nuance
The generic volume weighted average ACCU spot price moved from $36.60 at the end of 2025 to $36.28 at the end of Q1 2026. That number is the price of an ACCU with no method attached to it.
Very few buyers are actually buying that unit. A facility with a board position on land sector versus engineered abatement, a corporate claim that has to survive assurance, or a developer pricing a forward offtake is buying a method, and the generic number says nothing about any of it. Clima Markets exists to close that gap: daily pricing across ACCU methodologies, plus direct supply of 2.8 million ACCUs across 15 listed projects, including Forest Farm (ERF183334), available to buyers directly through the platform. That is a commercial position, and stating it plainly is better than implying the view here is disinterested.
The method premium cuts both ways. A method carrying stronger integrity signals usually has a thinner pool of units behind it, and a thin pool means less room to move when a delivery slips.
ACCUs and SMCs are both a tonne, and that is where the similarity ends
| ACCU | SMC | |
| Full name | Australian Carbon Credit Unit | Safeguard Mechanism Credit |
| What it certifies | One tonne of CO2-e stored or avoided by a registered project | One tonne of CO2-e by which a Safeguard facility finished below its own baseline |
| Who creates it | Any eligible project proponent running an approved method | Only a facility covered by the Safeguard Mechanism |
| Method label | Yes. Every unit traces to one method | No. There is no method behind an SMC |
| Voluntary claims | Available | Not the purpose of the unit |
| Time limit | None | Usable for Safeguard compliance in any year to 2030. Use after 2030 sits with the 2026-27 Safeguard Mechanism review |
| Where they sit | 56.5 million held outside the cost containment measure at 31 March 2026 | 11.0 million held at 31 March 2026, with 95% in Safeguard and Safeguard-related accounts |
The concentration in that last row matters. The CER describes the SMC market as thin and supply constrained, which is what happens when almost every unit sits with a party that has its own reason to keep it. For most buyers, the practical choice is between ACCU methods rather than between an ACCU and an SMC.
The Safeguard Mechanism is what makes the method question urgent
The Safeguard Mechanism applies to industrial facilities emitting more than 100,000 tonnes CO2-e a year. Standard and landfill baselines decline by 4.9% each financial year through to 30 June 2030, unless a facility has been declared trade-exposed baseline-adjusted, in which case the rate can fall as low as 1%.
The compliance math is already visible in the registry. In Q1 2026, 8.8 million ACCUs and 2.6 million SMCs were surrendered for Safeguard purposes, taking the 2024-25 compliance period total to 10.8 million ACCUs and 2.6 million SMCs. ACCU holdings excluding the cost containment measure fell by 4.2 million to 56.5 million. The CER expects 22 to 26 million ACCUs to be issued across 2026, and expects a drawdown of accumulated holdings later this decade as baselines keep falling.
A buyer choosing a method in 2027 is choosing from a supply pool that is being drawn down while the eligible method set is rewritten around them.
Where the public data stops
The CER publishes issuance by method type, project registrations, holdings, and a generic volume weighted average spot price. It does not publish a price per method. Nothing in the public record tells a buyer what a savanna unit cleared last week against an environmental plantings unit of the same vintage. The scheme mechanics are documented in unusual detail for a market this young. The method-level pricing is not, and no government source currently closes that gap.
FAQ
- What does ACCU stand for?
Australian Carbon Credit Unit. One ACCU represents one tonne of carbon dioxide equivalent stored or avoided by a project registered under the ACCU Scheme and issued by the Clean Energy Regulator.
- Is every ACCU the same?
Every ACCU carries the same one tonne value for compliance surrender. It does not carry the same method, permanence profile, vintage or buyer appeal, which is why units do not all clear at the same price.
- How many ACCU methods are open in 2026?
Eleven, across agriculture, energy efficiency, landfill and waste, mining, oil and gas, and vegetation, as listed by the CER at 26 June 2026.
- Can I still register a human-induced regeneration project?
No. Human-induced regeneration sits on the CER’s closed methods list. Existing projects continue to report and be issued units under it.
- How do ACCUs relate to the Safeguard Mechanism?
A facility whose net emissions exceed its baseline can surrender ACCUs or SMCs to return to compliance. Safeguard compliance is the main driver of ACCU demand.
- Where can I see ACCU prices by method?
Method-level pricing is not published by the CER. Clima Markets publishes daily pricing across ACCU methodologies.
Understand the method pricing before making your next buying decision
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Every figure in this article comes from the Clean Energy Regulator or the Department of Climate Change, Energy, the Environment and Water.
- CER, Quarterly Carbon Market Report, March quarter 2026, covering the quarter to 31 March 2026 and published 3 June 2026. Q1 issuance of 5.5 million ACCUs and the 3.8 million record set in 2024, the 3.7 million vegetation total and its 60% and 29% split, 69 project registrations against 90 a year earlier, the generic spot price moving from $36.60 to $36.28, the two savanna fire management methods made on 10 April 2026, and the SMC issuance, surrender and holdings figures alongside the CER’s description of a thin SMC market.
- CER, QCMR March quarter 2026: Australian environmental markets, as at 31 March 2026 and published 3 June 2026. Q1 surrenders of 8.8 million ACCUs and 2.6 million SMCs, the 10.8 million ACCU total for the 2024-25 compliance period, holdings falling by 4.2 million to 56.5 million, the 22 to 26 million issuance expectation for 2026, and the expected drawdown of holdings later this decade.
- CER, ACCU Scheme methods, page last updated 26 June 2026. The eleven open methods, the five categories they sit across, and what a methodology determination sets for a project.
- CER, Closed methods, retrieved 15 July 2026. Human-induced regeneration closed to new project registration.
- CER, Safeguard baselines, retrieved 15 July 2026. The 4.9% annual baseline decline to 30 June 2030 and the trade-exposed baseline-adjusted floor of 1%.
- CER, Permanence obligations, retrieved 15 July 2026. Permanence obligations carried by vegetation projects.
- DCCEEW, Safeguard Mechanism overview, retrieved 15 July 2026. The 100,000 tCO2-e coverage threshold, SMC issuance to facilities finishing below baseline, and SMC use to 2030 with post-2030 treatment referred to the 2026-27 review.
The Carbon Guy