Red, yellow alerts still up for Visayas grid MANILA – Another one-hour red alert is up for the Visayas grid on Thursday, from 5 p.m. to 6 p.m., due to unavailability of several power plants. Yellow alert is also in place, from 3 p.m. to 5 p.m. and from 6 p.m. to 9 p.m. Facebook.