Garden Island Landfill Gas Management

Garden Island Landfill Gas Management is a landfill gas project located at Garden Island, approximately 15km northwest of the Adelaide CBD in South Australia. It was registered in August 2015 by the Urban Renewal Authority (commonly known as Renewal SA).

Landfill gas projects involve the installation of a collection system, typically a network of pipes and extraction wells, to capture methane gas emitted by decomposing organic legacy waste. The captured gas is then combusted through flaring or used for electricity generation, preventing the potent greenhouse gas from entering the atmosphere and converting it into less harmful carbon dioxide.

The Garden Island area sits within the Port Adelaide River estuary. The surrounding land use is a mix of industrial operations, historical landfill sites, and sensitive marine and mangrove ecosystems. The region experiences a Mediterranean climate with relatively low annual rainfall averaging around 450mm. While the natural soils in this estuarine zone are typically coastal sands and saline clays, the project site itself predominantly consists of heavily modified, reclaimed landfill soils.

This project was established to recommence the operations of an existing landfill gas collection system that had been inactive for some time. Since its registration, the project has updated its operations to align with newer legislative frameworks, actively transitioning from the 2012 Legacy Waste methodology to the 2015 Landfill Gas Methodology Determination to maintain compliance and optimize its carbon abatement.