Red alert hoisted over Visayas grid; Mindanao under yellow alert on June 10, 2026

Electricity consumers in the Visayas might expect a series of rotating brownouts on Wednesday afternoon as a red alert status is hoisted over the island cluster due to higher demand and unavailability of several power plants.

In an advisory, the National Grid Corporation of the Philippines (NGCP) said the red alert is effective from 1 p.m. to 7 p.m. to be followed by a yellow alert from 7 p.m. to 9 p.m.

The NGCP cited the “decrease in HVDC power import from Mindanao” as a factor for the raising of red alert in the Visayas grid.

The grid operator said the islands group is currently operating at 2,429 megawatts (MW) capacity against a peak demand expected to hit 2,421 MW.

Meanwhile, a total of 890.4 MW capacity is unavailable to the grid as eight plants are on forced outage on June 2026, eight 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.

A red alert status is issued when the power supply is insufficient to meet consumer demand and the transmission grid’s regulating requirements.

Widespread power interruptions or rotational brownouts are expected.

In this situation, electricity is temporarily cut in certain areas on a scheduled basis to prevent the entire grid from collapsing.

A yellow alert, meanwhile, 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.

Mindanao grid

The Mindanao grid, on the other hand, is placed under yellow alert from 12 p.m. to 3 p.m.

The NGCP cited the following factors that contributed to the declaration of yellow alert:

• Tripping of GNPK 4
• Large capacity coal plants namely SEC 1, SEC 2, SMC 1 and SMC 2 still on forced outage as affected by the recent high magnitude earthquake
• Unavailability of FDC 3 due to boiler tube leak
• High demand forecast

Mindanao has an available capacity of 2,731 MW, while peak demand is seen to reach 2,611 MW.

The NGCP 12 plants are on forced outage in June 2026, three plants are on forced outage since May 2026, one plant since September 2025, and two plants since 2024, while 33 plants are running on derated capacities, “for a total of 1,259.9 MW unavailable to the grid.”—AOL, GMA News