(Eagle News) — The Luzon and Visayas grids were placed under yellow alert on Wednesday, April 17. The National Grid Corporation of the Philippines said the Luzon grid is under the alert from 1 p.m. to 11 p.m. The alert is hoisted over the Visayas grid from 1 p.m. to 10 p.m. A yellow alert means the operating margin is insufficient to meet the transmission grid’s contingency requirement. According to the NGCP, in Luzon, 18 […]