AEMO Procedure Change Proposals
View all current AEMO WEM Procedures
The WEM AEMO Procedure Change Working Group (APCWG) provides advice to AEMO on Procedure Change Proposals. Meeting contents, Terms of Reference and other information is available on the WEM APCWG page.
AEMO Procedure Change Proposals under consultation
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Completed Procedure Change Proposals
Completed Procedure Change Proposals include those undertaken by AEMO, the former Independent Market Operator, and the former System Management.
ID Submitter Title Status/Date AEPC_2026_03 AEMO Reserve Capacity Security Commenced 30 April 2026 AEPC_2026_05 AEMO Settlements Commenced 21 April 2026 AEPC_2026_04 AEMO Certification of Reserve Capacity Commenced 14 April 2026 AEPC_2025_13 AEMO Low Reserve Conditions Commenced 20 March 2026 AEPC_2026_02 AEMO Relevant Level Method Commenced 1 April 2026 AEPC_2026_01 AEMO Frequency Co-optimised Essential System Services (FCESS) Accreditation Commenced 26 February 2026 AEPC_2025_20 AEMO Credible Contingency Events Commenced 26 February 2026 AEPC_2025_23 AEMO SESSM Processes Commenced 30 January 2026 AEPC_2025_22 AEMO Declaration of Bilateral Trades Commenced 1 January 2026 AEPC_2025_21 AEMO Certification of Reserve Capacity Commenced 1 January 2026 AEPC_2025_19 AEMO Network Access Quantity Model Commenced 1 January 2026 AEPC_2025_12 AEMO Short Term PASA Commenced 26 November 2025 AEPC_2025_17 AEMO Dispatch of Demand Side Programmes Commenced 7 November 2025 AEPC_2025_15 AEMO Supplementary Capacity Commenced 1 January 2026 AEPC_2025_18 AEMO Essential System Service Quantities Commenced 30 October 2025 AEPC_2025_16 AEMO Determination of Market Schedules Commenced 30 October 2025 AEMO Dispatch Algorithm Formulation
Commenced 30 October 2025
AEPC_2025_07 AEMO Identification of Affected Dispatch Intervals Commenced 22/09/2025 AEPC_2025_08_09_10 AEMO IMS Interface – Network Operator and AEMO
Network Modelling Data
Communications and Control SystemsCommenced 05/09/2025 AEPC_2025_11 AEMO Declaration of Bilateral Trades Commenced 22/08/2025 AEPC_2025_04 AEMO Commissioning Tests Commenced 30/06/2025 AEPC_2025_06 AEMO Undertaking the Long Term PASA Commenced 24/06/2025 AEPC_2025_05 AEMO Mid Peak and Flexible Electric Storage Resource Obligation Intervals Commenced 20/06/2025 AEPC_2025_03 AEMO RCM Limit Advice Requirements Commenced 20/06/2025 AEPC_2025_2 AEMO Certification of Reserve Capacity Commenced 14/04/2025 AEPC_2025_1 AEMO Dispatch Settlement and Monitoring Data Commenced 02/04/2025 AEPC_2024_18 AEMO Facility Sub-Metering Commenced 17/02/2025 AEPC_2024_20 AEMO Credible Contingency Events Commenced 12/02/2025 AEPC_2024_17 AEMO Outage Intention Plans Commenced 06/02/2025 AEPC_2024_19 AEMO Direction of Registered Facilities in Scarcity Conditions Commenced 01/02/2025 AEPC_2024_16 AEMO Minimum Eligibility Requirements for Flexible CRC Commenced 15/01/2025 AEPC_2024_13 AEMO Dispatch Algorithm Formulation Commenced 06/01/2025 AEPC_2024_15 AEMO Determination of Market Schedules Commenced 06/01/2025 AEPC_2024_12 AEMO Real-Time Market Suspension Commenced 20/12/2024 AEPC_2024_14 AEMO Reliability Standard Implementation Commenced 02/12/2024 AEPC_2024_11 AEMO GPS Compliance Tests and Generator Monitoring Plans Commenced 29/10/2024 AEPC_2024_08 AEMO Dispatch Compliance Commenced 15/10/2024 AEPC_2024_09 AEMO Direction of Registered Facilities in Scarcity Conditions Commenced 15/10/2024 AEPC_2024_10 AEMO Reserve Capacity Testing Commenced 01/10/2024 AEPC_2024_07 AEMO Network Access Quantity Commenced 30/09/2024 AEPC_2024_06 AEMO Supplementary Capacity Commenced 10/09/2024 AEPC_2024_05 AEMO Mid Peak Electric Storage Resource Obligation Intervals Commenced 01/07/2024 AEPC_2024_04 AEMO RCM Constraint Formulation Commenced 13/06/2024 AEPC_2024_03 AEMO Long Term Projected Assessment of System Adequacy Commenced 13/06/2024 AEPC_2024_01 AEMO Supplementary Capacity Commenced 01/04/2023 AEPC_2023_02 AEMO Reserve Capacity Security Commenced 02/10/2023 AEPC_2024_02 AEMO Certification of Reserve Capacity Consultation 12/04/2024 AEPC_2023_03 AEMO Dispatch Algorithm Formulation Updates Commenced 12/12/2023 AEPC_2022_02 AEMO Distributed Energy Resource (DER) Register Information Commenced 02/10/2023 AEPC_2023_01 AEMO Supplementary Capacity Commenced 01/07/2023 AEPC_2022_01 AEMO Certification of Reserve Capacity for the 2022 and 2023 Reserve Capacity Cycle Commenced 20/12/2022 AEPC_2021_04 AEMO Prudential Requirements Commenced 28/2/2021 AEPC_2021_01 AEMO Reserve Capacity Testing Commenced 01/10/2021 AEPC_2021_02 AEMO Capacity Credit Allocation Commenced 16/9/2021 AEPC_2021_03 AEMO Settlements Commenced 16/9/2021 AEPC_2020_01 AEMO Revisions to BMO tie-break methodology Rejected 30/04/2021 AEPC_2020_03 AEMO Facility Registration, De-registration and Transfer Commenced 19/03/2021 AEPC_2020_07 AEMO Settlement Commenced 19/03/2021 AEPC_2020_10 AEMO Declaration of Bilateral Trades and the Reserve Capacity Auction Commenced 16/10/2020 AEPC_2020_06 AEMO Reduction of Prudential Exposure (Phase 2) Commenced 24/08/2020 AEPC_2020_04 AEMO Reserve Capacity Testing Commenced 01/08/2020 AEPC_2020_05 AEMO Reserve Capacity Security Commenced 01/07/2020 AEPC_2020_02 AEMO Certification of Reserve Capacity Commenced 15/06/2020 AEPC_2019_11 AEMO Prudential Requirements - Credit Limit Calculation Commenced 09/12/2019 AEPC_2019_10 AEMO Facility Outages Commenced 01/02/2020 AEPC_2019_09 AEMO Formalisation of the Process for Maintenance Applications Commenced 01/10/2019 AEPC_2018_03 AEMO Communications and Control Systems Commenced 01/07/2019 AEPC_2019_04 AEMO Dispatch Commenced 01/07/2019 AEPC_2019_06 AEMO Removal of Resource Plans and Dispatchable Loads Commenced 01/07/2019 AEPC_2019_07 AEMO Ancillary Services Commenced 01/07/2019 AEPC_2019_08 AEMO Power System Security Commenced 01/07/2019 AEPC_2018_05 AEMO IMS Interface Commenced 01/07/2019 AEPC_2018_01 AEMO Monitoring and Reporting Protocol Commenced 22/05/2019 AEPC_2019_01 AEMO Short Term Projected Assessment of System Adequacy Commenced 01/06/2019 AEPC_2019_02 AEMO Medium Term Projected Assessment of System Adequacy Commenced 01/06/2019 AEPC_2018_06 AEMO Commissioning Tests Commenced 01/06/2019 AEPC_2018_04 AEMO Facility Outages Commenced 07/01/2019 AEPC_2018_02 AEMO Tolerance Ranges Commenced 21/04/2018 AEPC_2017_05 AEMO Individual Reserve Capacity Requirements Commenced 03/11/2017 AEPC_2017_08 AEMO Network Modelling Data Commenced 13/10/2017 AEPC_2017_07 AEMO IMS Interface Commenced 13/10/2017 AEPC_2017_10 AEMO Dispatch Commenced 01/10/2017 AEPC_2017_11 AEMO Notices and Communications Commenced 01/10/2017 AEPC_2017_06 AEMO Undertaking the Long Term PASA and conducting a review of the planning criterion Commenced 01/10/2017 AEPC_2017_09 AEMO Reserve Capacity Performance Monitoring Commenced 01/10/2017 AEPC_2017_04 AEMO Certification of Reserve Capacity Commenced 01/10/2017 AEPC_2017_03 AEMO Determination of DSM Dispatch Payment Tranches and Adjustments Commenced 01/10/2017 PC_2017_01 AEMO Determination of Expected DSM Dispatch Quantity and DSM Activation Price Commenced 08/06/2017 PC_2017_02 AEMO 12 Market Procedures (see linked page) Commenced 18/04/2017 PC_2013_09 IMO Changes to Market Procedure for Reserve Capacity Performance Monitoring Rejected 02/04/2015 PC_2013_05 IMO Changes to Market Procedure for Reserve Capacity Security Commenced 19/01/2015 PC_2013_06 IMO Changes to Market Procedure for Certification for Reserve Capacity Commenced 1/01/2015 PC_2013_04 IMO Changes to Market Procedure for Prudential Requirements Commenced 1/05/2014 PC_2014_02 IMO Changes to Market Procedure for Bilateral Trade Declarations and Reserve Capacity Auction Commenced 16/04/2014 PC_2013_07 IMO Amendments to Market Procedure for Settlement Commenced 1/01/2014 PC_2013_02 IMO Changes to Market Procedure for Rule Participant Registration and De-Registration Commenced 1/11/2013 PC_2013_03 IMO Changes to Market Procedure for Facility Registration, De-Registration and Transfer Commenced 1/11/2013 PC_2013_08 IMO Amendments to Market Procedure for IMS Interface Commenced 2/10/2013 PC_2012_11 IMO Changes to Market Procedure for Notices and Communications Closed 18/06/2013 PC_2012_09 IMO Changes to Market Procedure for Determining Loss Factors Commenced 20/05/2013 PC_2012_10 IMO Amendments to Market Procedure for IMS Interface Commenced 22/04/2013 PC_2012_07 IMO Changes to Market Procedure for Certification of Reserve Capacity Commenced 18/03/2013 PC_2012_06 IMO Changes to Reserve Capacity Procedure for Declaration of Bilateral Trades and the Reserve Capacity Auction Commenced 25/02/2013 PC_2012_08 IMO Amendments to Market Procedure for Maximum Reserve Capacity Price Commenced 15/01/2013 PC_2012_05 IMO Amendments to Market Procedure for Data and IT Interface Commenced 13/08/2012 PC_2012_02 IMO New Market Procedure for Balancing Facility Requirements Commenced 1/07/2012 PC_2012_03 IMO New Market Procedure for Balancing Market Forecasts Commenced 1/07/2012 PC_2012_04 IMO New Market Procedure for IMS Interface Commenced 1/07/2012 PC_2012_01 IMO Changes to Market Procedure for Reserve Capacity Security Commenced 2/04/2012 PC_2010_08 IMO Changes to Market Procedure for Supplementary Reserve Capacity Commenced 23/01/2012 PC_2011_07 IMO Changes to Market Procedure for Procedure Administration Commenced 1/01/2012 PC_2010_03 IMO Changes to Market Procedure for Monitoring Protocol Withdrawn 24/11/2011 PC_2011_06 IMO 5-Yearly Review of the Methodology and Process for Determining the Maximum Reserve Capacity Price Commenced 24/10/2011 PC_2011_05 IMO Market Procedure for Reserve Capacity Testing Commenced 1/10/2011 PC_2011_01 IMO Revocation of Market Procedure for Procurement of Network Control Service Commenced 1/07/2011 PC_2011_02 IMO Market Procedure for Data and IT Interface Requirements Commenced 1/07/2011 PC_2011_03 IMO Transitional arrangements for the Registration of Demand Side Programmes and the association of Non-Dispatchable Loads (New Market Procedure) Commenced 1/07/2011 PC_2010_05 IMO Changes to Market Procedure for Reserve Capacity Performance Monitoring Commenced 18/04/2011 PC_2010_07 IMO Changes to Market Procedure for Web Site Changes Commenced 24/01/2011 PC_2010_06 IMO Changes to Market Procedure for the Certification of Reserve Capacity Commenced 15/12/2010 PC_2010_01 IMO Changes to Market Procedure for Procedure Administration Commenced 8/11/2010 PC_2010_02 IMO Changes to Market Procedure for Notices and Communications Commenced 8/11/2010 PC_2010_04 IMO Market Procedure for the Determination of Maximum Reserve Capacity Price Commenced 11/10/2010 PC_2009_10 IMO Market Procedure for Reserve Capacity Testing (V3) Commenced 1/10/2010 PC_2009_11 IMO Market Procedure for Undertaking the LT PASA and conducting a Review of the Planning Criterion Commenced 1/06/2010 PC_2009_12 IMO Market Procedure for the Determination of Maximum Reserve Capacity Price Commenced 1/04/2010 PC_2009_05 IMO Market Procedure for Declaration of Bilateral Trades and the Reserve Capacity Auction Commenced 1/01/2010 PC_2009_02 IMO Market Procedure for Procedure Administration Commenced 1/10/2009 PC_2009_08 IMO Market Procedure for Meter Data Submissions Commenced 1/10/2009 PC_2009_01 IMO Reserve Capacity Security Commenced 24/07/2009 PC_2009_03 IMO Market Procedure for Registration and De-registration of Rule Participants Commenced 24/07/2009 PC_2008_16 IMO Notices and Communications Commenced 20/01/2009 PC_2008_15 IMO Market Procedure for Individual Reserve Capacity Requirements Commenced 11/12/2008 PC_2008_14 IMO Market Procedure for Determination of Maximum Reserve Capacity Price Commenced 4/12/2008 PC_2008_13 IMO Market Procedure for Individual Reserve Capacity Requirements Withdrawn 27/10/2008 PC_2008_12 IMO Market Procedure: Facility Registration, Facility De-registration and Facility Transfer Commenced 26/11/2008 PC_2008_10 IMO Market Procedure: Monitoring Protocol Commenced 20/10/2008 PC_2008_11 IMO Market Procedure for Procurement of Network Control Service Commenced 20/10/2008 PC_2008_07 IMO Market Procedure for Reserve Capacity Performance Monitoring Commenced 15/10/2008 PC_2008_08 IMO Market Procedure for Prudential Requirements Commenced 15/10/2008 PC_2008_06 IMO Market Procedure for Determination of the Maximum Reserve Capacity Price Commenced 13/10/2008 PC_2008_04 IMO Market Procedure for Certification of Reserve Capacity Commenced 15/07/2008 PC_2008_05 IMO Market Procedure for Declaration of Bilateral Trades and the Reserve Capacity Auction Commenced 15/07/2008 PC_2008_01 IMO Market Procedure for Registration of Rule Participants Commenced 12/06/2008 PC_2008_02 IMO Market Procedure for Facility Registration, Facility De-registration and Facility Transfer Commenced 12/06/2008 PC_2008_03 IMO Market Procedure for Web Site Changes Commenced 12/06/2008 PPCL0026 System Management Changes to PSOP: Facility Outages as a result of RC_2012_11: Transparency of Outage Information Commenced 7/04/2014 PPCL0027 System Management Revised PSOP: Dispatch Commenced 5/03/2014 PPCL0025 System Management Revised PSOP: Commissioning and Testing Commenced 1/03/2014 PPCL0024 System Management Revised PSOP: Monitoring and Reporting Protocol Rejected 01/08/2013 PPCL0021 System Management Replaced PSOPs: Competitive Balancing and Load Following Market 1 Commenced 1/07/2012 PPCL0022 System Management Replaced PSOPs: Competitive Balancing and Load Following Market 2 Commenced 1/07/2012 PPCL0023 System Management Replaced PSOPs: Competitive Balancing and Load Following Market 3 Commenced 1/07/2012 PPCL0020 System Management Operational Data Points Commenced 6/02/2012 PPCL0016 System Management Commissioning and Testing Commenced 1/08/2011 PPCL0017 System Management Facility Outages Commenced 1/08/2011 PPCL0018 System Management Dispatch Commenced 1/08/2011 PPCL0019 System Management Monitoring and Reporting Protocol Commenced 1/08/2011 PPCL0015 System Management Dispatch Commenced 1/04/2010 PPCL0013 System Management Dispatch Commenced 1/03/2010 PPCL0014 System Management Dispatch Commenced 1/03/2010 PPCL0010 System Management Cleansing of Generation Facility MWh Output Data Commenced 1/11/2009 PPCL0012 System Management Monitoring and Reporting Commenced 1/10/2009 PPCL0009 System Management Commissioning and Testing Commenced 1/09/2009 PPCL0011 System Management Communications and Control Systems Commenced 1/09/2009 PPCL0007 System Management Operational Data Points for Generating Plant Commenced 1/08/2009 PPCL0008 System Management Operational Data Points for Non-Western Power Networks, Substations and Loads Commenced 1/08/2009 PPCL0003 System Management Facility Outages Commenced 1/04/2009 PPCL0004 System Management Ancillary Services Commenced 1/04/2009 PPCL0005 System Management MT PASA Commenced 1/04/2009 PPCL0006 System Management ST PASA Commenced 1/04/2009 PPCL0002 System Management Power System Security Commenced 1/02/2009 PPCL0001 System Management System Restart Overview Commenced 1/04/2008