Guidelines to make the integrated system plan actionable

  • Accepting submissions
Regulatory investment test and guidelines
Date initiated: 
20 November 2019
General enquiries - Guidelines to make the ISP actionable
AER reference: 


The Australian Energy Regulator (AER) is developing guidelines to make the integrated system plan (ISP) actionable. These include:

  • a new cost benefit analysis guideline
  • a new forecasting best practice guideline
  • updates to existing regulatory investment test (RIT) instruments
  • updates to existing RIT application guidelines.

These guidelines are part of a broader Energy Security Board (ESB) reform. The ESB is developing new rules to make the ISP an actionable strategic plan by strengthening the links between it and the transmission planning process.

Under the new rules, the ISP will provide a whole of system plan for the efficient development of the power system that meets power system needs for a planning horizon of at least 20 years. The ISP will influence transmission planning by triggering regulatory investment tests for transmission (RIT–Ts) and replacing some elements of the RIT–T process. The RIT is a cost benefit analysis that network businesses must perform and consult on before making major investments in their networks

Under the draft rules, the ISP will be subject to additional governance arrangements through binding cost benefit analysis guidelines and forecasting best practice guidelines. There will also be changes to the regulatory investment tests (RITs) and associated application guidelines to be consistent with the new planning process.

We are developing these guidelines in line with the consultation process set out in the National Electricity Rules. We commenced the consultation process on 20 November 2019 with the publication of an issues paper.

Invitation for submissions

On 20 November 2019, we published an issues paper as part of our development of guidelines to make the integrated system plan actionable.

We invite interested stakeholders to make written submissions in response to the specific questions raised in this paper, or any other matter relevant to the development of guidelines to make the ISP actionable. Submissions are requested by the close of business on 17 January 2020 and should be emailed to

Upcoming stakeholder forum

A joint public forum on both the ESB’s draft rules and our issues paper will be held on 5 December 2019 in Sydney. The purpose of this forum is to provide stakeholders with an overview of these documents and an opportunity to ask questions to help inform their submissions.