OBS_VALUE: Access fees are regulated at the national level by the Australian Competition and Consumer Commission - ACCC.On 6.03.2018, ARTC submitted the 2018 Interstate Access Undertaking (IAU) application in order to replace the 2008 undertaking due to expire on 21.08.2018. On 20.12.2018, the ACCC released its draft decision on the proposed undertaking and invited stakeholders to make submissions. However, on 25.01.2019, ARTC withdrew the proposed undertaking from the ACCC's consideration. The ACCC had concerns with the ARTC's proposed mechanism for adjusting the Indicative Access Charges Range, but still welcomes submissions on the Draft Decision given its relevance to the development and assessment of a replacement undertaking. On 23.08.2019 ARTC proposed to revalue the Regulatory Asset Base on the Interstate network using the Depreciated Optimised Replacement Cost (DORC) methodology, to address the concerns raised in the draft decision in respect of ARTC’s proposed RAB roll forward. The ACCC has confirmed since November 2019 that the DORC Methodology is the most appropriate to value the RAB of the Interstate Network. Note that the ARTC submitted an application for extension of the 2008 IAU to 30.06.2021, which was accepted by the ACCC on 19.06.2020. The existing regulatory framework will continue, while the DORC valuation is finalised, ARTC develops a replacement undertaking and the ACCC assesses that undertaking.The ACCC first accepted an access undertaking from ARTC in relation to the Hunter Valley Rail Network in June 2011. On 29.06.2017, the ACCC consented to a variation to that undertaking incorporating revised commercial parameters and a new expiry date of 31.12.2021. On 29.11.2018, the ACCC consented to a further variation incorporating path based pricing, allocating incremental capital costs on the basis of contracted capacity, and applying a dual ceiling limit.