Manila, June 15 -- The Visayas grid is under yellow alert status anew Monday due to the unavailability of four generating units of major coal-fired power plants and available capacity is not enough to meet contingency requirements.

The National Grid Corporation of the Philippines, in an advisory, said the grid is in yellow alert from 4 p.m. to 9 p.m., with available capacity at 2,581 megawatts (MW) and peak demand expected to reach 2,482MW.

It said units 1 and 2 of the Therma Visayas Inc., unit 3 of the Panay Energy Development Corporation, and unit 1 of the KEPCO SPC Power Corp. remain on forced outage, lessening the generating capacity of the grid.

For this month alone, nine power plants are on forced outage, eight since May, one s...