Investigate to see whether the power failure is limited to just a part of your home. If you're working in the kitchen, for example, try clicking on a light switch in the living room. If the electricity is not functional anywhere in your house, look outside. See whether lights are visible at your neighbors' or phone them to ask if they have power. In an apartment building, look to see whether the hallway lights are on.
When the power outage affects more than just your home, check your utility outage map to see if there is a larger outage in your area and get updates on the estimated restoration time.
Turn off your light switches and unplug electrical devices to protect them from power surge damage when the service is restored.