MANILA -- Meralco, the country's largest power distributor, said Friday contingency measures were in place to ensure electricity supply during the May elections, as Luzon was hit with rotational brownouts for the third straight day.

In the 2016 presidential vote, Meralco deployed generator sets in critical areas to ensure that there are no outages, company spokesman Jose Zaldarriaga said.

"Contingency measures are in place to make sure uninterrupted and elections," he said.

The rotational brownouts on Friday were projected to last for up to 3 hours with the entire Luzon under red alert, the highest supply warning, due to a lack of reserves.

• Meralco warns of up to 3-hour brownouts with Luzon on highest alert