Initial Regulatory Asset Base Determination

The initial regulatory asset base (IRAB) is the value of assets used by the railway owner to provide access to its network, and it forms the foundation for calculating allowed revenue and return on investment.

The approved initial regulatory asset base is available in the table below.

Document

Date Documents File type
17-Jul-25 Summary of information requests sent to Arc Infrastructure
 Adobe PDF 152 kB
17-Jul-25 Additional supporting material for Arc’s Infrastructure statement of the depreciated optimised replacement cost (Part 2) Microsoft Excel 70 kB
11-Jul-25 Additional supporting material for Arc’s Infrastructure statement of the depreciated optimised replacement cost (Part 1) Microsoft Excel 1.1 MB
16-Jun-25 Arc Infrastructure statement of the depreciated optimised replacement cost Adobe PDF 6.1 MB
16-Jun-25 Arc Infrastructure covering letters and route section valuations Adobe PDF 580 kB
16-Jun-25 Arc Infrastructure level of service demand forecast statement Adobe PDF 13 MB
10-Apr-25 Notice for pre-lodgement consultation Adobe PDF 167 kB
Page last updated: 17 Jul 2025

The ERA is Western Australia's independent economic regulator. We aim to ensure the delivery of water, electricity, gas and rail services in Western Australia is in the long-term interest of consumers.

Acknowledgement of Country

The Economic Regulation Authority acknowledges the traditional custodians throughout Western Australia and their continuing connection to the land, waters and community. We pay our respects to all members of the Aboriginal communities and their cultures; and to Elders past, present and emerging.

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