MANILA, Philippines The Luzon grid is expected to experience power outages until next week after another power plant bogged down yesterday, causing rotational blackouts over prolonged hours. The National Grid Corp. of the Philippines (NGCP) raised the red alert warning on the Luzon power grid from 10 a.m. to 5 p.m. and from 6 p.m. to 10 p.m. yesterday. The yellow alert notice was from 9 a.m. to 10 a.m., from 5 p.m. to 6 p.m. and from 11 p.m..