Yellow alert raised over Visayas grid on Saturday, May 30, 2026

The Visayas grid will be placed under yellow alert anew for five hours on Saturday afternoon to evening as major coal plants in the islands-cluster have derated capacities.

In an advisory, the National Grid Corporation of the Philippines (NGCP) said the Visayas grid will be on yellow alert from 5 p.m. to 10 p.m. on May 30.

This comes as the available capacity was recorded at 2,581 megawatts (MW) against a peak demand 2,454 MW, while a total of 961.5 MW remain unavailable to grid.

The grid operator said 13 plants are on forced outage 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 12 plants are running on derated capacities.

It said the factors that contributed to the yellow alert declaration were the unavailability of Visayas' large coal plants TVI 1, TVI 2, PEDC 3, and KSPC 2 as well high system demand forecast.

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

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