The Wickham Point Pipeline (WPP), Weddell Lateral and WPP Inpex Lateral are transmission pipelines in the north-west region of the Northern Territory near Darwin. The WPP and Weddell Lateral is owned by Energy Infrastructure Investments (EII) and is operated by the APA Group. The APA Group has a 19.9 per cent interest in Energy Infrastructure Investments. The other companies involved in EII are Marubini (49.9 per cent interest) and Osaka Gas (30.2 per cent interest). The WPP to Inpex Lateral is owned by Power and Water Corporation NT.

The WPP is 12 km in length and has a maximum gas flow capacity of 90 TJ/day. It was built to deliver gas on an emergency supply basis from the LNG Plant at Wickham Point to the Amadeus Gas Pipeline and Power and Water Corporation’s Weddell Power Station near Darwin. The section of the WPP from Darwin City Gate WPP to Weddell Power Station has been in operation since early 2008, while the remainder of the pipeline between the Weddell Power Station and the Wickham Regulating Station was commissioned in May 2009. 

The Weddell lateral is 2 km in length and connects the Wickham Point Pipeline to Darwin via the Darwin City Gate. The Weddell Lateral also acts as an emergency supply point for the Amadeus Gas Pipeline (AGP), with gas coming from the Bayu Undan gas fields.

The WPP to Inpex Lateral runs between the exiting Wickham Point Pipeline and the new Inpex Gas Plant in Darwin.

The Wickham Point Pipeline (WPP), Weddell Lateral and WPP Inpex Lateral are currently non-scheme pipelines, and is subject to the access regime for non-scheme pipelines under Chapter 6A of the NGL and Part 23 of the NGR. On 30 November 2022, the AER granted a 5 year category 2 exemption under Part 23 of the NGR for the WPP alongside their determination for the Weddell Lateral.