MANILA, Philippines — Demand for power sagged in service areas of the Manila Electric Co. (Meralco) in March and April after the Luzon-wide community quarantine shuttered businesses and keep people inside their homes. In a disclosure to the local bourse on Tuesday, Meralco said peak demand for power— select hours in a day when energy consumption is typically at their highs— was “reduced by almost 40%” to 4,516 megawatts in March, and further down to 4,289 MW so far in April.