Erskine Park Landfill Gas Project

The Erskine Park Landfill Gas Project is a waste management and emissions reduction initiative located at the Erskine Park Landfill in Western Sydney, New South Wales. Situated approximately 15 kilometers southeast of Penrith and 40 kilometers west of the Sydney CBD, the project operates within a major industrial precinct that was historically a quarrying and grazing area. The landfill itself sits within a former volcanic breccia quarry void, a unique geological feature for the region. The project was registered in July 2015, transitioning from an earlier Carbon Farming Initiative (CFI) method to the 2015 Landfill Gas determination.

Landfill gas projects involve the installation and operation of systems that collect methane generated by decomposing organic waste. Under the Carbon Credits (Carbon Farming Initiative, Landfill Gas) Methodology Determination 2015, the project earns credits by capturing this gas, which would otherwise vent into the atmosphere, and combusting it via flaring or electricity generation to convert the methane into less potent carbon dioxide. This specific project manages gas from both "legacy" waste (deposited before July 2012) and "non-legacy" waste, ensuring comprehensive emissions control.

The Erskine Park region experiences a temperate climate with an average annual rainfall of approximately 700–800mm, which is slightly drier than coastal Sydney. The surrounding landscape is part of the Cumberland Plain, characterized by heavy clay and shale-derived soils (often Red Podzolic or Chromosols). However, the site's immediate geology is distinct due to its history as a hard rock quarry.

A notable feature of this site is its integration with local industry; historical development plans included a pipeline to supply captured landfill gas to the nearby Austral Bricks Plant 23 for use as renewable energy in brick kilns. More recently, the site has gained attention for the "Great Wall of Sydney," a massive mechanically stabilized earth (MSE) wall constructed to allow for a "live expansion" of the landfill's capacity, extending its operational life significantly beyond its original 2020 forecast. The project proponent, Enviroguard Pty Limited, is a subsidiary of the major waste management company Cleanaway.