(UPDATE2) A widespread blackout hit Metro Manila and other parts of Luzon Wednesday as major power plants went into emergency shutdown.
A total of 3,700 megawatts of power have been dropped from the Luzon grid, the National Grid Corp. of the Philippines said. This figure represented 45 percent of Luzon's power demand.
As of 7:30 p.m., Meralco said: "Due to power generation deficiency brought about by the outage of several power plants, a 4-hour rotational brown-out is presently being implemented."
The power failure was caused by the emergency shutdown of five power plants, NGCP spokesperson Mutya Alabanza told Yahoo! Southeast Asia earlier by phone.
She refused to reveal the power plants which have shut down, however, noting only that this resulted in blackouts in Metro Manila and North Luzon.
Earlier she said the blackouts are expected to last for four hours.
The Makati Business District and other commercial hubs in the city have been affected.
The blackout has also led to a halt in train operations, particularly in the Light Rail Transit Authority Line 2.
"LRT2 on code red - all trains on hold position, no entry in all stations due to power failure," LRTA spokesperson Hernando Cabrera said via Twitter.
In a separate update via Twitter at 6 p.m., Meralco said it could not assure the time when power will be restored.
"There is no estimated time of restoration yet, all efforts are being exerted to restore the power at the soonest possible time," Meralco said.