In Philippine Electricity Market Corporation (PEMC) v. Therma Mobile, Inc. (TMO), G.R. No. 224341, promulgated on 10 November 2025, the Supreme Court's Third Division held that a penalty imposed by the PEM Board for violation of the Wholesale Electricity Spot Market (WESM) Must-Offer Rule is an enforcement matter that cannot be brought to dispute resolution or arbitration under the WESM Rules. The proper remedy against the PEM Board's final decision is a petition for certiorari under Rule 65 before the Court of Appeals (CA). The decision was penned by Associate Justice Maria Filomena D. Singh.

Background

TMO operated power barges in Navotas and was a WESM participant under a Market Participation Agreement dated 5 April 2013. After an investigation, the PEM Board found TMO liable for 3,578 counts of violating the Must-Offer Rule for the period 26 October to 25 December 2013 and imposed a penalty of about PHP 234.9 million. Its reconsideration was denied. TMO then filed a Notice of Dispute and, before the Regional Trial Court (RTC) of Pasig, an urgent petition for interim measures of protection under Rule 5 of the Special ADR Rules, and obtained an injunction against collection. The CA affirmed the RTC.

Key rulings

  • The WESM dispute mechanism is an arbitration agreement. Through the Market Participation Agreement, the WESM dispute resolution mechanism binds participants as an agreement to arbitrate.
  • But penalties are excluded. A Must-Offer Rule violation falls under the WESM Rules' enforcement provisions, not the dispute resolution provisions. The Penalty Manual states that penalties are not subject to dispute resolution; the remedy is reconsideration and appeal within the PEMC process, and the PEM Board's decision on reconsideration is final and executory upon receipt.
  • Remedy is Rule 65 certiorari. A participant may challenge the PEM Board's final decision through a petition for certiorari before the CA within sixty (60) days.
  • No automatic stay. Even assuming dispute resolution were available, starting it does not suspend the obligation to pay, under Section 4.1.1 of the WESM Dispute Resolution Manual.
  • PEMC's authority stands on its own. The nullity of the ERC's 3 March 2014 Order (struck down in an earlier case) does not invalidate the investigation, because PEMC's power to investigate and penalize does not depend on prior ERC authorization.

Disposition

The Court granted the petition, reversed the CA Decision and Resolution, and remanded the case to the CA to determine whether the PEM Board committed grave abuse of discretion in finding the Must-Offer Rule violation. The question of the propriety of the injunction was left to the CA.

Practical takeaways

  • Do not route WESM penalty challenges to arbitration or the RTC. Use reconsideration within PEMC, then Rule 65 certiorari before the CA within 60 days.
  • Budget for payment: initiating dispute resolution does not stay payment obligations.
  • Review WESM compliance on offers, since the Must-Offer Rule is enforced through PEMC's own penalty process.

Source: Philippine Electricity Market Corporation v. Therma Mobile, Inc., G.R. No. 224341, 10 November 2025 (Third Division).

This alert was prepared by OS Law. This alert is for general information only and is not legal advice. Please consult counsel on how these rules apply to your specific circumstances.