Web alarm clock for 9:42 p.m.
You are preparing early to check the power company's outage message, so set the alarm for 9:42 pm before you get absorbed in another evening task. That leaves a useful reminder ahead of 10:00 pm, when you may want to confirm the affected barangays, note the expected restoration time, and charge anything you will need if your area is included.
Your outage check depends on the alarm sounding at the right moment, so keep this browser active and prevent your phone or computer from sleeping before 9:42 pm. A browser alarm cannot alert you after its page has been closed or the device has gone to sleep. Turn the volume up enough to hear it over the air conditioner, then leave the screen connected to power if the battery is already low.
Because you are checking an outage notice during a warm Philippine evening, consider the room temperature before changing the air conditioner setting. If electricity may stop later, cool the room moderately while power is available, close curtains that hold back outdoor heat, and keep doors shut. At 9:42 pm, read whether the notice covers your location and timing before deciding how long to run the air conditioner.