MANILA - The Philippines' power transmission operator again placed the Luzon and Visayas power grids on yellow alert on Tuesday as energy reserves remained thin. 

The National Grid Corp of the Philippines said the following alerts were in effect. 

LUZON 

Yellow alert
2 p.m. - 4 p.m.

8 p.m. - 10 p.m.

At around 1 p.m. the NGCP lifted the alert for the Visayas as the grid was able to tap additional power from Mindanao

"A yellow alert is issued when the operating margin is insufficient to meet the transmission grid’s contingency requirement," the NGCP said.

This means that power reserves are thin and localized or rotating brownouts are possible.

For the Luzon grid, the NGCP said the available capacity is 14,950 megawatts, while peak demand is 13,902 MW.

For the Visayas grid, the available capacity is 2,881 MW while peak demand is 2,580 MW.

The Department of Energy admitted last week that the power situation in the country has reached crisis levels. Meralco meanwhile warned that the situation may get worse in May as the weather gets hotter and consumer demand for electricity rises.