Any condition in which the electricity supplied by a private or commercial power source is interrupted. For a UPS, a power failure is any condition that results in a loss of input power. Some variations on the concept of a power failure include: Blackout - A complete loss of power to the UPS. Brownout - A condition where the power voltage drops below the lower limit of the UPS, causing the UPS to switch to battery power via the inverter. Surge - A condition in which power voltage exceeds the upper limit of the UPS, causing a switch to battery power.
equipment failure resulting when the supply of power fails; "the ice storm caused a power outage"
a complete interruption of electrical power
a situation in which electricity becomes unavailable in a building, resulting in a loss of artificial light and, usually, use of equipment
In case of power failure, the gas valve is automatically closed.
If a power failure occurs on your premises, any resulting damage to your property is covered. If a loss is caused by a power failure off your premises, the loss is not covered. For example, if a storm knocks out power from your local electric company and your freezer-full of filet mignon is endangered, better have an immediate barbecue feast. (Special coverage can be purchased to insure your refrigerated goods against spoilage in this case.)
"Power Failure" is episode 2 of season 1 of the NBC situation comedy Good Morning, Miami.