A government ERF advisory body has called for the development of scheme-wide guidance on whether the discovery of flaws in ERF methods should result in carbon credit clawbacks.
While Prime Minister Scott Morrison has strongly criticised Labor's plan to allow large emitters to use some international carbon credits, the Coalition government has acquired more than 28 million of them.
As big emitters re-enter the carbon market as active buyers, it's unclear whether Safeguard Mechanism changes will help or hinder the growth of trading, according to experts.
The federal government's ERF advisory committee has launched a review of rules for two types of carbon offset projects that between them have abatement contracts worth about $1 billion.
Corporate Carbon, which has soil carbon contracts worth about $200 million, says a proposed rewrite of ERF soil project rules still imposes unnecessary costs and requirements.
There has been a jump in carbon credits delivered under ERF contracts and a significant increase in large-scale renewables capacity, according to the Clean Energy Regulator's latest annual report.