On 28 June 2018 ARTC submitted an application to vary its 2008 Interstate Access Undertaking by four months until 21 December 2018.
On 3 July 2018 the ACCC sent a letter to stakeholders seeking comments on ARTC's proposal. Submissions were due by 17 July 2018.
On 25 July 2018 the ACCC consented to ARTC's variation application.