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Program Information and Fact Sheets

Five-Minute Settlement (5MS) program

AEMO has established the 5MS Program in order to coordinate the implementation of changes as a result of the Five-Minute Settlement rule change, and the proposed Global Settlement rule change (if the AEMC make such a determination).

Five-Minute Settlement rule

On 28 November 2017, the AEMC made a final determination and rule to alter the settlement period for the wholesale electricity spot market from 30 minutes to five minutes, to align with the dispatch period. The commencement of the change is from 1 October 2021.

The AEMC determined that five-minute settlement would provide a better price signal for investment in fast response technologies, such as batteries, new gas peaking generation, and demand response. The alignment of the operational dispatch and financial settlement periods are expected to lead to more efficient bidding, operational decisions, and investment.

Information regarding the rule change, including the final determination and rule, is published on the AEMC website.

As part of consultation on the rule change, AEMO prepared a high-level design. This design outlines AEMO’s preliminary views on the procedure and systems impact of 5MS.

Global settlement rule

On 6 December 2018 the AEMC made a final rule that requires a move to a global settlement framework for the demand side of the wholesale electricity market. The commencement date for this rule change is 1 May 2022.

The three key reasons why the AEMC has made a final rule to move to a global settlement framework are:

  1. Improved transparency, leading to fewer settlement disputes and lower levels of Unaccounted for Energy (UFE) over time.
  2. Competition on equal terms.
  3. Improved risk allocation driving enhanced incentives.

Information regarding the rule change, including the final determination and rule, is published on the AEMC website.

Information sessions

AEMO holds information sessions regularly throughout the program to help inform the broader industry on the changes and activities that are being undertaken. Slides and notes from the sessions will be published below.

Fact sheets

AEMO will be preparing fact sheets on various aspects of the program, which will be published below as available.

Further information

Please direct any queries regarding Five-Minute Settlement (5MS) to

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