Manila, Dec. 11 -- The National Grid Corporation of the Philippines has placed the Visayas grid on yellow alert, from 5 p.m. to 9 p.m. on Thursday, due to low operating margin after an uptick in demand.

In an advisory, the transmission operator said the grid's available capacity is around 2,578 megawatts (MW) while peak demand is around 2,535MW.

A yellow alert is issued when a grid's operating margin is not enough to meet the contingency requirement.

Prior to the alert issuance, 10 power plants in the Visayas are already on forced outage, with one not providing power since 2021.

Also, 16 power plants units are on derated capacity, bringing the total unavailable capacity to the grid at around 482.41MW.

This, along with the 36MW uptick...