The National Grid Corp. of the Philippines (NGCP) issued a red alert in the Luzon grid from 1 to 4 p.m. on Friday but went back to yellow alert by 3:01 p.m. on the same day.

Red alert means there is insufficient power supply in the grid, while yellow alert means reserve is less than the capacity of the largest running power plant (Sual at 647 megawatts).

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