loss of power; power outage; blackout
Refers to a complete loss of electrical power, often in a facility, device, or system. More formal and technical than 停電, which is the everyday word for a power outage.
A power loss occurred in the server room, and the system went down.
We installed an uninterruptible power supply in preparation for a power outage.
停電 is the common, everyday term for a power outage affecting homes or neighborhoods. 電源喪失 is more technical and often refers to loss of power within a specific system or facility.
Compound of 電源 (power source) and 喪失 (loss). The exact historical derivation is uncertain, but the word follows standard Sino-Japanese compounding patterns.