On 6 June 2017, ARTC applied to the ACCC to vary its 2011 Hunter Valley Access Undertaking. The variation seeks to change a number of provisions in the undertaking, including:
- rate of return
- remaining mine life
- the term of the undertaking (to 31 December 2021).
On 6 June 2017, the ACCC sent a letter to industry seeking comments on ARTC's proposal. Submissions were due by 20 June 2017.
On 16 June 2017, ARTC submitted a revised variation application incorporating finalised access charges.
On 29 June 2017, the ACCC consented to ARTC's revised variation application.