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WESM Manuals
Title Description Date Published File Type Size
Billing and Settlement Manual Issue 5.1 This document contains the concept, flowchart and procedural steps in the preparation of settlement statement, payment of settlement amount, prudential requirements and suspension 02 Jul 2020 PDF 845 KB
Registration, Suspension and De-Registration Criteria and Procedures Issue 4.1 This manual presents the criteria, guidelines and procedures for the registration, suspension and de-registration of members and participants in the Wholesale Electricity Spot Market. 02 Jul 2020 PDF 1 MB
Guidelines on Significant Variations In and Between Trading Intervals Issue 4.0 This document provides the guidelines and non-exhaustive list on significant variations in and between trading intervals. 20 Dec 2019 PDF 514 KB
Procedures for Changes to the WESM Rules, Retail Rules and Market Manuals Issue 3.0 This document covers the method and procedures for changes to the WESM Rules, Retail Rules and Market Manuals. 30 Jul 2018 PDF 515 KB
Dispute Resolution Manual Issue 6.0 This document covers detailed procedures and requirements for the resolution of WESM related disputes. 20 Jun 2018 PDF 806 KB
Management of Net Settlement Surplus Issue 3.0 This manual sets the procedure for the allocation of the net settlement surplus in the Philippine Wholesale Electricity Spot Market. 07 May 2018 PDF 726 KB
Constraint Violation Coefficients and Pricing Re-run Issue 5.0 - The Manual has been approved in reference to the promulgation of further amendments to the WESM Rules for the Implementation of Enhancements to WESM Design and Operations through DOE DC Nos. DC2016-10-0014 and DC2017-03-0001. 22 Jun 2017 PDF 278 KB
Administered Price Determination Methodology Issue 6.0 This document contains the concept and procedures for determining the administered price that will be used in the Philippine Wholesale Electricity Spot Market during market suspension and intervention. 02 Jun 2017 PDF 419 KB
Dispatch Protocol Issue No. 12.0 This document covers the timetable and procedures of the Dispatch Protocol. 02 Jun 2017 PDF 1 MB
Management of Must-Run And Must-Stop Units Issue 8.0 This document sets the dispatch criteria of Must-Run Units based on pre-defined categories under the WESM regime and the manner of settlement of Must Run Units and Displaced Generators. 02 Jun 2017 PDF 367 KB
Guidelines Governing the Constitution of the PEM Board Committees Issue 3.0 This document sets forth the qualifications and disqualification of members of the PEM Board Committees and the process of their selection and appointment. 31 May 2017 PDF 489 KB
Market Operator Information Disclosure and Confidentiality Issue 4.0 This manual presents the guidelines and procedures for the disclosure and protection of information received or generated by the Market Operator arising from or in the course of the performance of its functions of operating the Wholesale Electricity Spot 31 May 2017 PDF 260 KB
Metering Standards and Procedures Issue 11.0 This document covers the development, validation, approval, publication and revision of the WESM Metering Manual. 31 May 2017 PDF 3 MB
Procedures for the Monitoring of Forecast Accuracy Standards for Must Dispatch Generating Units Issue 1.0 This manual establishes the procedures for the monitoring, reporting, and review of the forecast accuracy standards for compliance of must dispatch generating units. 13 May 2017 PDF 235 KB
Emergency Procedures Issue 3.0 This document prescribes general procedures that will be followed by the System Operator and by all WESM Participants whenever there is the existence of a situation which has an adverse material effect on electricity supply or which poses as a significant 03 Aug 2016 PDF 1 MB
System Security and Reliability Guidelines Issue No. 1.0 This document prescribes general guidelines that must be followed by all WESM Participants to maintain the security and reliability of the Luzon, Visayas and Mindanao power systems. 03 Aug 2016 PDF 224 KB
Technical Committee Market Manual Issue 2.0 This document establishes the scope, functions and responsibilities of the Technical Committee pursuant to the WESM Rules. 29 Apr 2016 PDF 286 KB
Management Procedure on Excess Generation Issue 2.0 This document covers the mechanism and policies to be employed to manage expected periods with excess generation. 29 Sep 2015 PDF 2 MB
Constraint Violation Coefficients (CVC) Issue 4.0 This document covers the determination of the Constraint Violation Coefficient to be used by the Market Dispatch Optimization Model and the corresponding procedures and policies to be applied in the WESM. 19 Nov 2014 PDF 1 MB
Management Procedure for Load Shedding Issue 2.0 This document covers method and procedures in managing load shedding. 14 May 2014 PDF 1 MB
Load Forecasting Methodology Issue 2.0 This manual sets out the procedures for determining load forecast used in the relevant market runs in the Philippine Wholesale Electricity Spot Market 02 Apr 2014 PDF 3 MB
Methodology for Determining Pricing Errors and Price Substitution Due to Congestion for Energy Transactions in the WESM Issue 4.0 This manual presents the guidelines and criteria for determining what constitutes pricing errors arising due to congestion in the network as well as the guidelines and procedures for the determination of the substitute prices and quantities to be used for 02 Apr 2014 PDF 2 MB
Market Network Model Development and Maintenance – Criteria and Procedures Issue 3.0 This document describes the processes involved in the development, approval, publication and revision of the WESM market network model. 02 Apr 2014 PDF 2 MB
Segregation of Line Rental Trading Amounts Issue 1.0 This documents the manner of computing line rental trading amounts in the WESM, and determines the methodology for segregating line rental trading amounts into amounts associated with cost of losses and of congestion. 08 Nov 2013 PDF 1 MB
PEM Audit Market Manual Issue 2.0 This document covers objectives, scope and procedures of various audits of the Market Operator and the WESM to be conducted by the PEM Auditor. 11 Apr 2012 PDF 3 MB
Procedure for Determining Ex-Post Nodal Energy Prices Issue 2.0 This document describes the calculation of ex-post nodal energy prices for the WESM. 11 Nov 2010 PDF 1 MB
Criteria and Guidelines for the Issuance of Pricing Error Notices and Conduct of Market Re-Run Issue 1.0 This document establishes the criteria and guidelines for issuance of Pricing Error Notices (PEN) and for conducting Market Re-Run (MRR) in the Philippine Wholesale Electricity Spot Market. 27 Oct 2010 PDF 2 MB
Market Surveillance, Compliance and Enforcement Market Manual Issue 3.0 This document covers procedures and detailed requirements, data exchange, reports and activities for market assessment, surveillance, compliance and enforcement. 27 Apr 2010 PDF 6 MB
Financial Penalty Manual Issue 1.0 This manual covers the schedule of financial penalties applicable to WESM Members, the Market Operator and the System Operator. 02 Dec 2008 PDF 2 MB
Pricing and Cost Recovery Mechanism for Reserves in the Philippine WESM 17 Nov 2006 PDF 875 KB
Procedure on Start-up and Shutdown of a Generating Unit Issue 1.0 This document outlines the procedures to be implemented by the Market Operator in the start-up and shutdown of generating units. 06 Jun 2006 PDF 129 KB
Ancillary Services Monitoring Manual Issue 0.0 This document covers method and procedures in monitoring the Ancillary Services. 13 Dec 2004 PDF 58 KB
WESM Consultation Guidelines Issue 1.0 This manual presents the criteria, guidelines and procedures for the registration of participants in the retail market. 16 Jun 2004 PDF 94 KB