Outage
An outage is a period when a service, typically electricity, internet, or other utilities, is not available due to a failure or maintenance work.

Examples:
1- The water outage affected the entire neighborhood for most of the day, leaving residents unable to use their sinks, toilets, or showers
2- Microsoft suffered a massive, ongoing global IT outage on Friday morning, affecting airports, airlines, banks, and hospitals, and as a result, a child in an airport in Spain was lost.