The National Grid Corp. of the Philippines (NGCP) declared a yellow alert for the Visayas and Mindanao grids on Friday from 6 p.m. to 8 p.m., citing thin power reserves due to plant outages.
A yellow alert signifies that the operating margin is insufficient to meet the transmission grid’s contingency requirement, NGCP said.
It said that on the Visayas, available capacity on Friday was 2,569 megawatts (MW) against a peak demand of 2,449 MW. Ten plants were on forced outage from April to July, with six other power plants remaining offline since 2024. Four additional plants are running at reduced capacities, making a total of 423 MW unavailable to the grid.
Meanwhile, Mindanao’s available capacity reached 2,827 MW compared to a peak demand of 2,667 MW. Eleven power plants were on forced outage from June to July, and two remain out since 2024. Three plants are operating at reduced capacities, resulting in 638.3 MW unavailable to the Mindanao grid.
NGCP also attributed the yellow alerts in both grids to high system demand. The Luzon grid, however, was under normal condition.
The Department of Energy (DOE) earlier assured the public of sufficient power supply for the remaining months of the year.
“We are currently validating the report and actual status in Mindanao and Visayas,” Department of Energy Undersecretary Mario Marasigan said, when asked for comment.
 declared a yellow alert for the Visayas and Mindanao grids due to thin power reserves and plant outages, impacting the country's electricity supply.%%excerpt%%){kind=link}