GBG completed Phase 1 of its kiln efficiency research programme, testing retort kiln configurations across three pilot sites in Central Uganda. The results confirm the technical and commercial viability of the GBG production model.
Key Findings
Biochar yields of 18–22% from eucalyptus feedstock were consistently achieved across all sites, representing a significant improvement over traditional earth kilns that yield 10–15% charcoal and produce no biochar at all. Charcoal co-production yields of 24–28% were also achieved, supporting the dual-revenue model that underpins GBG’s economics.
Emissions monitoring during kiln operation confirmed very low particulate matter and CO emissions compared to traditional production methods, validating the environmental claims central to GBG’s carbon certification approach.
Next Steps
Phase 2 trials will focus on mobile metallic kiln optimisation and biomass pre-treatment to further improve yields. GBG is targeting biochar yields of 20–25% in commercial operations as operator training and process discipline improve with scale.