Grid operator National Grid Corp. of the Philippines (NGCP) said the alert was raised from 2 p.m. to 4 p.m. and from 5 p.m. to 10 p.m. Among the factors that contributed to the raising of the alert were the tripping of the Sual U2 and the emergency shutdown of the GNPD U2 due to a leak in its boiler tube. As of 1 p.m. yesterday, the available capacity of the grid was 12,969 megawatts while peak demand was 11,768 MW.