The Mindanao power grid was placed under yellow alert as available capacity neared peak demand as of 8 a.m. on Tuesday, August 11, 2026, according to the National Grid Corporation of the Philippines (NGCP).

NGCP said the yellow alert was scheduled from 10 a.m. to 4 p.m. and from 5 p.m. to 8 p.m.

NGCP added that the grid has an available capacity of 2,672 megawatts (MW) against a peak demand of 2,527 MW.

According to the latest grid status report, 12 power plants were on forced outage in August 2026 – seven have been offline since July, one since June, two since January, one since 2025, and two since 2024.

Meanwhile, five other plants were operating at derated capacities.

These resulted in a total of 709.1 MW capacity unavailable to the grid.

NGCP said among the factors that contributed to the declaration of the yellow alert included the maintenance outage of GNPK 2 that began on July 28, 2026, and the extended outage of SEC 2.

The emergency shutdown of GNPK 1 on August 9, 2026 due to a boiler tube leak also contributed to the reduced available capacity.

NGCP said a yellow alert is declared when the operating margin of the power grid is insufficient to meet the required contingency requirement.