Bakit brownout? At totoo bang isang linggo na ganito?

To those affected by rotational brownouts today, June 1, 2021, hang in there.
PHOTO/S: Huzeyfe Turan on Unsplash

From your neighborhood Starbucks to the Senate session hall, the rotating brownouts in Luzon spared no one.

For June 1, 2021 alone, the National Grid Corporation of the Philippines (NGCP) placed the Luzon grid under red alert for 11 hours, from 10:01 a.m. to 5 p.m. and 6:01 p.m. to 10 p.m.

This could persist for six days, the NGCP said.

There will be discomfort from the heat and inconveniences (or relief) from disrupted MS Teams or Zoom calls because of the brownouts.

On a more serious note, this could disrupt cold storage for COVID-19 vaccines that require electricity, said Senator Sherwin Gatchalian, the Senate energy committee chairman.

Gatchalian demanded an explanation from the Department of Energy (DOE) for the brownouts.

Continue reading below ↓

Why are these brownouts happening?

Simply put, brownouts happen when the power supply is not enough to meet the demand.

The DOE said that the high heat index pushed the demand for power.

Unscheduled outages at Luzon power plants contribute to the dwindling supply. Ageing power plants, which malfunction frequently, are also to blame.

Continue reading below ↓

When this happens, privately-owned NGCP, which links power generators to distribution utilities, announces alert notices:

  • White alert means there is sufficient supply
  • Yellow alert means power reserves are low
  • Red alert means power is insufficient, resulting in rotational brownouts or manual load dropping


These are based on MERALCO'S official announcements on Twitter:

June 2, between 10 a.m. to 3 p.m., Baras and Tanay, Rizal

Continue reading below ↓

June 3, 12:01 a.m. to 5 a.m., Carmona, Cavite

June 3, 1 a.m. to 2 p.m., Cainta, Rizal

June 3-4, 11 p.m. to 5 a.m., PHILAM Area in Quezon City

June 3-4, between 10 to 10:30 p.m. and 6:30 to 7 a.m., Angat, Bustos, Pandi, San Jose Del Monte, Norzagaray in Bulacan

Continue reading below ↓

June 5, between 1:30 to 1:59 a.m. and 6:01 to 6:30 a.m., General Trias and Rosario, Cavite

June 6, between 1 a.m. to 6 a.m., Cardona and Binangonan, Rizal

June 6, between 6 a.m. to 6 p.m., Sto. Tomas, Batangas

June 6, between 8 a.m. to 3 p.m., Tondo, Manila

June 6, between 1:30 and 1:59 a.m. and 8:01 to 8:59 a.m., General Trias, Imus, Dasmariñas in Cavite

What is being done to avoid power shortages?

There are short-term solutions.

Those at home are requested to be more energy efficient, by unplugging appliances when not in use; cleaning fans and air conditioners frequently to ensure unimpeded airflow; using compact fluorescent lamps or LED bulbs, and defrosting the refrigerator when the ice in the freezer reaches one-fourth inches thick.

Continue reading below ↓

MERALCO also has an interruptible load program (ILP), where big businesses with generator sets will be alerted to switch on their gensets when NGCP fires off red alert notices. This gives room for more energy supply for customers in residential areas, lessening the likelihood of rotational brownouts.

There are also long-term solutions.

The Luzon grid, which generates the most power compared to the Visayas or Mindanao grid, experiences a deficit when the demand exceeds the supply.

According to officials, at least 400 MW is needed as reserve to prevent rotational outages.

How to build reserves? More power needs to be produced. There are power supply agreements (PSAs) pending with the Energy Regulatory Commission (ERC), Meralco said. If approved, this means more power plants built and an increase in energy generation.

Currently, the Luzon and Visayas grids are interconnected.

In 2018, the Mindanao-Visayas Interconnection Project (MVIP) was launched to connect the three power grids into one unified grid, the NGCP said. Once complete, it could help deliver excess capacity from the Mindanao grid to the Luzon grid.

Continue reading below ↓

It was supposed to be completed by December 2020, but COVID-19 travel restrictions and damaged fiber optic submarine cables hampered its completion.

We are now on Quento! Download the app to enjoy more articles and videos from and other Summit Media websites.
Read Next
Latest Stories
Trending in Summit Media Network

Featured Searches:

Read the Story →
To those affected by rotational brownouts today, June 1, 2021, hang in there.
PHOTO/S: Huzeyfe Turan on Unsplash
  • This article was created by . Edits have been made by the editors.

    View Results
    Total Votes: 12,184
  • 50%
  • View Results