There are plenty of reasons that a region will lose electrical power. Ice storms, snow storms, wind storms, tornadoes, hurricanes, earthquakes, wildland fires, to name just the natural disaster side of things. 

We are all inconvenienced when there is a power outage. However, when a nursing home loses power and they don't have a generator, fuel or sufficient emergency power to power all their critical functions---it is a disaster!

See this story, Nursing Homes Facing Life-or-Death Decisions in Power Blackouts.

Note that deaths in nursing homes that are associated with the power outage many occur days or weeks after the event. 

A huge issue for nursing homes that do have generators is having enough fuel for a prolonged outage. This would argue to have natural gas or propane fueled generators, but there are other planning considerations that come into play for those types of installations too.