Cullen Wines Wilyabrup soil carbon project

Cullen Wines Wilyabrup Soil Carbon Project is a soil carbon sequestration project located in the famous Wilyabrup sub-region of Western Australia, approximately 25 kilometers north of the Margaret River township. Registered in June 2021, the project covers nearly 84 hectares of land known for premium viticulture and grazing. The project is managed by the celebrated winery Cullen Wines, with Carbon West Pty Ltd acting as the project agent.

The project operates under the 2021 Soil Carbon methodology (Estimation of Soil Organic Carbon Sequestration using Measurement and Models). This method requires land managers to implement new agricultural activities, such as altering stocking density or improving pasture species, to increase the amount of carbon stored in the soil. Credits are issued based on measured increases in Soil Organic Carbon (SOC) levels compared to a baseline, often using a hybrid of physical soil coring and predictive modeling to verify the gains. For this specific project, activities include sowing multi-species cover crops (up to 12 different species) and managing grazing pressure to promote soil health.

The Wilyabrup region is characterized by a Mediterranean climate with high winter rainfall, typically averaging between 1,000mm and 1,200mm annually. The area is renowned for its "Forest Grove soils," which are ancient, free-draining ironstone gravels and sandy loams. These soils are naturally low in fertility but highly prized for viticulture due to their drainage and heat-retention properties.

A notable aspect of this project is its integration into Cullen Wines' broader sustainability strategy. Cullen Wines was the first winery in Australia to be certified carbon neutral and now claims "carbon negative" status, sequestering more carbon than the business emits. The winery utilizes biodynamic farming principles, and this project formalizes their soil stewardship into a registered carbon framework, likely for "insetting" their own emissions rather than purely for external trade.