Overview
In June 2016, AGIG successfully completed the Ashburton Onslow Gas Pipeline (AOGP) for Horizon Power, the foundation shipper, with funding from Chevron Australia. The AOGP links the Dampier Bunbury Natural Gas Pipeline (DBNGP) through our Ashburton West gas hub to the new gas-fired Onslow power station. The project includes an 87km, 6-inch refurbished lateral pipeline connected to a newly constructed 24km, 4-inch pipeline, both of which are fully owned and operated by AGIG.
Detailed engineering and design
The pipeline was surveyed and designed in 2014 with construction complete by 2016. The easement runs parallel to the Wheatstone Ashburton West Pipeline for 87km, connecting the DBNGP at Compressor Station 2 to the Ashburton West gas hub.
Heritage, environmental and land management approvals
During the development of the agreements, we strategically leveraged existing approvals, notably the Buurabalayji Thalanyji Aboriginal Corporation agreement previously executed for the Wheatstone Ashburton West Pipeline.
All approvals were executed in time for construction and obligations closely monitored during construction and operation to maintain compliance.
Technical approvals
The AOGP operates two pipeline licenses governed by the Department of Mines, Industry Regulation and Safety (DMIRS). License PL 110 covers the newly constructed 24-kilometre pipeline connecting Ashburton West Facilities to the Onslow power station, while PL 19 applies to the existing 87-kilometre segment running from the DBNGP to Ashburton West.
Procurement
The construction was primarily carried out by local labour with AGIG adding specific pipeline expertise and quality control. Maximising the Onslow workforce reduced construction costs, as many workers returned each night rather than staying in temporary accommodation onsite. Our own staff on the project also stayed in Onslow, further contributing to the local economy.
