Ti Tree Energy Generation Project

Ti Tree Energy Generation Project is a landfill gas project located at the Ti Tree Bioenergy facility in Willowbank, approximately 15km southwest of Ipswich in Queensland. Registered in July 2015, the project operates within a significant waste management site that utilizes a 37 million cubic metre void left by a former open-cut coal mine. The surrounding region of Willowbank is characterized by a mix of industrial precincts, such as the motorsport park and airbase, alongside rural residential and grazing land.

Projects operating under the Electricity Generation from Landfill Gas methodology aim to reduce greenhouse gas emissions by capturing methane generated from decomposing organic waste. Instead of allowing this potent gas to vent into the atmosphere, the system collects it and combusts it, typically through internal combustion engines, to generate renewable electricity. This process not only mitigates the global warming potential of the methane but also contributes dispatchable power to the local grid.

Environmentally, the site is situated in a subtropical zone receiving moderate to high rainfall, averaging around 800mm to 900mm annually. While the broader Ipswich region features heavy clay soils (Vertosols) and sandy loams derived from the Walloon Coal Measures, the project site itself is a highly engineered environment. The facility uses bioreactor technology, which recirculates leachate to accelerate the decomposition of waste, rapidly stabilizing the landfill mass compared to traditional "dry tomb" landfills.

The project is a joint venture between Veolia and J.J. Richards & Sons, although Veolia is listed as the proponent for the carbon project. Notably, the facility has generated significant amounts of renewable energy, with reports indicating capacity to power thousands of homes. It has a complex history of methodology transitions, moving from earlier Carbon Farming Initiative (CFI) methods to the current 2021 determination, ensuring continued credit issuance for its abatement activities.