Manila, Aug. 19 -- Yellow alert is still in place for the Visayas grid for Wednesday, from 5 p.m. to 10 p.m., due to limited capacity.

According to the National Grid Corporation of the Philippines (NGCP), the grid's available capacity is around 2,481 megawatts (MW) while peak demand is expected to reach 2,428MW.

NGCP issues a yellow alert when a grid's operating margin is not enough to meet contingency requirements.

This as Units 1 and 2 of the Therma Visayas Inc. remain unavailable, and electricity imports from Mindanao are still low because of forced outage of several coal-fired power plants and high demand.

NGCP said a total of 11 power plants are on forced outage this month alone, and 20 others have not been working for as long a...