Visayas grid placed under yellow alert on Saturday, June 6, 2026

The Visayas power grid was placed under yellow alert on Saturday afternoon due to the unavailability of major plants coupled with higher demand.

In an advisory, the National Grid Corporation of the Philippines (NGCP) said the yellow alert status is effective from 5 p.m. to 7 p.m.

The grid operator earlier said that all of the country’s power grids, including the Visayas, are stable but warned that a major plant outage or a significant increase in projected demand in the islands group may still trigger a yellow alert.

The NGCP said cited the unavailability of Visayas' large coal plants —TVI 1, TVI 2, and PEDC 3– and increase in demand forecast as factors that contributed to the yellow alert declaration.

Moreover, it said that the islands-cluster is currently operating at an available capacity of 2,640 megawatts (MW) against a peak demand of 2,493 MW, while a total of 897.6 MW capacity is unavailable to the grid.

This resulted from the forced outage of five plants since June 2026, eight plants since May 2026, one plant since March 2026, three plants since 2025, two plants since 2024, two plants since 2023, and one plant since 2021; while 11 plants are running on derated capacities.

A yellow alert is issued when the operating margin is insufficient to meet the transmission grid’s contingency requirement.

READ: What does each power alert level mean?

While supply is still enough to meet current demand, it no longer reaches the required safety margin.

At this level, the possibility of rotational power interruptions increases. —KG, GMA News