advisories & notices

The Rules Change Committee (RCC) is inviting all WESM Members and interested parties to submit comments to SNAP Group’s Proposed General Amendments to the WESM Ancillary Services Monitoring Manual (ASMM) Issue 1.2 on Additional Conditions for Qualifying a Frequency Driven Event (FDE) (ORCP-WM-26-03).

The proposed amendment seeks to amend Section 5.6.2 of the ASMM by introducing an additional condition to determine the termination of an FDE, in view of the following:

1. Give ample time for the Reserve Facility to normalize its loading near the Unit setpoint, which is the initial reference of the Unit governor in computing the desired response.
2. Variances from the Reserve Facility’s Frequency Reference compared to the System Frequency.
3. Reduction of multiple Frequency Driven Events occurrences.

BACKGROUND:

The SN Aboitiz Power-Magat, Inc. and SN Aboitiz Power-Benguet, Inc. (collectively, the 'SNAP Group') submitted the proposed amendments on 24 March 2026 as an Urgent Amendment. Upon deliberation during its 257th Regular Meeting, the RCC determined that the proposal did not meet the urgency criteria and subsequently reclassified it as a General Amendment proposal. Consequently, the PEM Board, during its 95th Meeting on 29 April 2026, concurred with the RCC’s decision on the said proposal.

DOCUMENTS:

Provided below are relevant materials for your reference and perusal:

• Original Rules Change Proposal submitted by SNAP Group (ORCP-WM-26-02)
• Presentation of the Proposed Amendment
• PEM Board-approved proposal (RCC Resolution No. 2026-03) per PEM Board Approval on 29 April 2026
• RCC Form 3: Matrix of Proposed Amendments for Comments – Annexes of this document (Please write your comments in the proper columns in the matrix.)

Kindly submit your comments (in Word format) through the ‘File a Submission’ webpage no later than 16 June 2026 or 30 working days from the date of publication (04 May 2026). We recommend using Firefox browser for submitting your comments.

Please ensure that your submission is signed securely by the designated approving authority and/or representative of your company, and input in the proper field the e-mail address of your point person(s) whom we could contact regarding activities related to the processing of the proposal.

All comments received shall be published in the PEMC website.

Thank you!

Rules Review Division

Market Assessment Group

Philippine Electricity Market Corporation

+632 8631 8734 | mag_rrd@wesm.ph | www.wesm.ph

18F Robinsons Equitable Tower, ADB Avenue, Ortigas Center, Pasig City 1600, Philippines