Australian integrity body demands immediate soil carbon method fixes to cut over-crediting
Australia's carbon market watchdog wants urgent changes to soil carbon crediting rules, with ACCU supply and Safeguard Mechanism compliance costs both in the balance.
Australia's carbon market integrity watchdog has called for urgent amendments to the soil carbon methodology, citing a significant risk that projects are generating credits that do not represent real emissions reductions. The Clean Energy Regulator's assessment, published in early June (2026-06-02), targets the estimation approach used to calculate how much carbon is actually stored in the ground, a method that underpins a large share of Australian Carbon Credit Unit supply.2
Soil carbon projects have become a core pillar of Australia's domestic offset market, with ACCUs increasingly traded as a hedge against compliance costs under the Safeguard Mechanism. Any tightening of the method's rules would likely shrink the volume of new credits entering the market, supporting prices at a time when the regulator is already under pressure to weed out inflated baselines.2
The integrity body's report stops short of suspending new project registrations, but the language is direct. It recommends changes to the way project proponents model soil organic carbon increases, arguing current parameters allow over-crediting where observable field data diverges from modelled outcomes. Traders said the regulatory signal points toward a more conservative issuance pipeline ahead of the method's next scheduled review.2
This is not a new debate for the Australian market. Methods have been revised before, and each revision has triggered a repricing of ACCU contracts as market participants adjust expectations for future supply. The difference now is that the regulator appears to be moving faster, with recommendations framed as immediate rather than incremental.2
The broader context is uncomfortable for the voluntary carbon sector globally. A Guardian investigation published in late May 2024 (2024-05-28) found that of 32 Verra-certified forest projects analysed, most were likely junk, with the remainder problematic and potentially worthless. Verra has faced mounting criticism over its methodology and lax safeguards since that analysis appeared.4
Recent enforcement actions have sharpened the market's focus on integrity. The co-founder of a California-based offsets developer and fintech startup was sentenced to 14 years in a US prison in late May (2026-05-31) after admitting to a years-long fraud scheme tied to a $248 million operation. The sentence has concentrated minds among buyers who had treated offset quality as a secondary concern.2
New Zealand is charting a different course. Its government announced support in late May (2026-05-28) for voluntary carbon and nature markets, effectively offering a warrant of fitness to signal which markets can be trusted, without directly regulating them. That light-touch approach may unlock finance, but it risks credibility if the underlying methods are not independently scrutinised.1
The Australian regulator's method-specific recommendations stand in contrast to that hands-off posture. By focusing on calculation rules rather than market structure, the integrity body is signalling that the problem is not buyer demand but seller supply discipline. That is a more direct challenge to project developers who have built pipelines on generous modelling assumptions.2
Senegal's experience shows how quickly over-crediting claims can corrode confidence. Researchers said in mid-June (2026-06-10) that the country's billion-tree climate project had sold ghost carbon, with much of the credited restoration never actually existing. Restoration efforts expanded so aggressively that unsuitable sites were included simply to meet planting targets.3
For ACCU traders, the near-term question is whether the regulator's recommendations translate into a formal method revision before year-end or dissolve into another consultation round. Spreads between ACCU vintages have widened in past method revisions as participants priced in supply disruption, and the same dynamic could reassert itself if a formal consultation is announced.2
There is also the demand-side response to consider. Facilities covered by the Safeguard Mechanism can use ACCUs to meet their emissions obligations, and if supply tightens while covered emissions stay flat, credit prices should firm. If the regulator instead grandfathers existing projects, the impact would be delayed and cushioned.2
The integrity body's report does not quantify the scale of potential over-crediting, leaving the market to guess at the magnitude of any supply correction. That absence of a headline number is itself informative: the regulator is signalling direction first and letting project developers adjust their models before the rules formally change.2
A formal consultation before year-end would bind the method tighter by the first half of 2027. A delay would keep the overhang hanging over ACCU prices. Watch for the regulator's next procedural step — that timing will tell the market more than the report itself already has.2