Nullwarra Improvement Carbon Project 4

Nullwarra Improvement Carbon Project 4 is a soil carbon sequestration project located approximately 45km southwest of Cobar in the Orana region of New South Wales. Registered in November 2025, the project covers a project area of roughly 507 hectares. The surrounding region lies within the Cobar Peneplain and is predominantly utilised for extensive grazing of sheep and cattle, characterized by its red earth soils and semi-arid scrubland.

The project operates under the Carbon Credits (Carbon Farming Initiative, Estimation of Soil Organic Carbon Sequestration using Measurement and Models) Methodology Determination 2021. This methodology requires the proponent to implement new land management activities to build soil organic carbon stocks. In this specific project, the activities involve applying synthetic or non-synthetic fertilizers to address nutrient deficiencies and altering grazing stocking rates or intensity to improve soil health and vegetation cover. The "Measurement and Models" approach uses a hybrid system of physical soil sampling and digital modeling to calculate the number of Australian Carbon Credit Units (ACCUs) generated over time.

Environmentally, the Cobar district is classified as semi-arid, with a historical average annual rainfall of approximately 390mm. The soils in this area are typically Red Kandosols (red earth) or Red Chromosols, which are well-drained but often nutrient-poor, alongside areas of Grey and Brown Vertosols (clay soils) in the lower-lying plains. The project is facilitated by AgriProve Solutions, a prominent soil carbon project developer, and appears to be part of a larger aggregation of projects on the "Nullwarra" property, as indicated by the existence of similarly named projects (e.g., Nullwarra Improvement Carbon Project 9) in the Clean Energy Regulator's register.