By GMA News Published May 27, 2026 8:33am Updated May 27, 2026 8:35am + Add GMA on Google Make this your preferred source to get more updates from this publisher on Google. The National Grid Corporation of the Philippines on Wednesday said the Visayas grid will be on yellow alert from 6 to 7 p.m. May 27.The available capacity is 2,682 MW but peak demand is at 2,415 MW, NGCP said in an advisory issued at 8 a.m."A yellow alert is issued when the operating margin is insufficient to meet the transmission grid’s contingency requirement," it added.READ: What does each power alert level mean?According to NGCP, some power plants are on forced outage while others are running below maximum rated capacity."12 plants are on forced outage since May 2026, 1 plant since March 2026, 3 plants since 2025, 2 plants since 2024, 2 plants since 2023, and 1 plant since 2021, while 12 plants are running on derated capacities, for a total of 858.15MW unavailable to the grid," it said.The company also said the unavailability of large coal plants TVI 1, TVI 2, and PEDC 3 in Visayas and the high system demand forecast were factors that led to the declaration of a yellow alert. —KG, GMA News