Settlement Technical Guides
This page provides technical specifications, guides and other documentation related to settlement of the WEM.
WEM Settlement Formulation
The Prudential and Settlement System (PaSS) application is built on the basis of the independently certified WEM Metering, Settlement and Prudential Calculation formulation document.
This document creates a mathematically accurate representation of the ESM Rules, including:
- Representation of Sets for use within the document;
- Mathematical equation representation of the ESM Rules;
- Specification for Variables used by the calculations;
- Trading Margin calculation for Participants on a given day;
- Settlement of the relevant market services;
- Interest calculation for the Adjustment Process; and
- Input estimation methodology for Prudentials.
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Historic versions
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16/02/2026
WEM Metering Settlement and Prudential Calculations Version 11.0
Effective date 26 February 2026
943.28 KB -
16/02/2026
WEM Metering Settlement and Prudential Calculations Version 11.0 – Text
Effective date 26 February 2026
410.33 KB -
29/09/2025
WEM Metering Settlement and Prudential Calculations Version 10.0
Effective date 30 October 2025
930.16 KB -
29/09/2025
WEM Metering Settlement and Prudential Calculations Version 10.0 - Text
Effective date 30 October 2025
396.46 KB -
17/09/2025
WEM Metering Settlement and Prudential Calculations Version 9.0
Effective date 4 June 2025
958.14 KB -
17/09/2025
WEM Metering Settlement and Prudential Calculations Version 9.0 - Text
Effective date 4 June 2025
350.38 KB -
08/07/2025
WEM Metering Settlement and Prudential Calculations Version 8.2
Effective date 20 November 2024
955.13 KB -
08/07/2025
WEM Metering Settlement and Prudential Calculations Version 8.2 - Text
Effective date 20 November 2024
348.89 KB -
07/03/2025
WEM Metering Settlement and Prudential Calculations Version 8.1
Effective date 20 November 2024
953.86 KB -
07/03/2025
WEM Metering Settlement and Prudential Calculations Version 8.1 - Text
Effective date 20 November 2024
348 KB -
11/11/2024
WEM Metering Settlement and Prudential Calculations Version 8.0
Effective date 20 November 2024
943.93 KB -
11/11/2024
WEM Metering Settlement and Prudential Calculations Version 8.0 - Text
Effective date 20 November 2024
341.21 KB -
14/10/2024
WEM Metering Settlement and Prudential Calculations Version 7.0
Effective date 7 October 2024
919.86 KB -
14/10/2024
WEM Metering Settlement and Prudential Calculations Version 7.0 - Text
Effective date 7 October 2024
327.54 KB -
19/12/2023
WEM Metering Settlement and Prudential Calculations Version 6.0
Effective date 13 December 2023
946.01 KB -
11/11/2024
WEM Metering Settlement and Prudential Calculations Version 8.0 - Text
Effective date 20 November 2024
341.21 KB -
19/12/2023
WEM Metering Settlement and Prudential Calculations Version 6.0 - Text
Effective date 13 December 2023
325.58 KB -
21/11/2023
WEM Metering Settlement and Prudential Calculations Version 5.2
Effective date 1 October 2023
955.55 KB -
21/11/2023
WEM Metering Settlement and Prudential Calculations Version 5.2 - Text
Effective date 1 October 2023
332.53 KB -
02/10/2023
WEM Metering Settlement and Prudential Calculations Version 5.1
Effective date 1 October 2023
945.7 KB
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Other Settlement Formulations
Current versions
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22/09/2026
WEM Relevant Demand Baseline Calculations Version 1.0
Effective date 1 October 2026
224.13 KB -
26/08/2026
WEM Individual Reserve Capacity Requirement Calculations Version 2.4
Effective date 1 October 2023
312.07 KB -
25/08/2023
WEM Standalone Calculations Version 2.0
Effective date 1 October 2023
192.71 KB
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Historic versions
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12/01/2026
WEM Individual Reserve Capacity Requirement Calculations Version 2.3
Effective date 1 October 2023
313.26 KB -
07/03/2025
WEM Individual Reserve Capacity Requirement Calculations Version 2.2
Effective date 1 October 2023
298.3 KB -
12/09/2024
WEM Individual Reserve Capacity Requirement Calculations Version 2.1
Effective date 1 October 2023
269.97 KB -
25/08/2023
WEM Individual Reserve Capacity Requirement Calculations Version 2.0
Effective date 1 October 2023
268.35 KB -
25/08/2023
WEM Standalone Calculations Version 1.1
267.32 KB
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Settlement Statements and Invoices
This WEM Settlement Statement and Invoice Technical Guide provides general information about the formats of the Settlement Statements and Invoices produced by AEMO in accordance with the ESM Rules.
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Historical versions
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04/02/2026
WEM Settlement Statement and Invoice Technical Guide Version 5.0
638.97 KB -
08/10/2025
WEM Settlement Statement and Invoice Technical Guide Version 4.0
Effective date 30 October 2025
637.58 KB -
07/03/2025
WEM Settlement Statement and Invoice Technical Guide Version 3.0
Effective date 20 November 2024
577.84 KB -
21/11/2023
WEM Settlement Statement and Invoice Technical Guide Version 2.0
Effective date 1 October 2023
464.86 KB -
25/08/2021
WEM Settlement Statement and Invoice Technical Guide Version 1.0
Effective date 1 August 2021
426.51 KB
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