power outage
power failure

It had to be a power failure of some kind.

But just as they are about to leave, there is a power failure!

They were for use in the event of a power failure.

The power failure was the latest in a series of problems at the hospital.

"I guess it would be bad if all of them went down at once, in a power failure."

He must have followed him up and come in immediately before the power failure.

There was a power failure and the lights went out.

But one must file within 30 days of the power failure.

But what came up on the screen showed no power failure.

On the opening night of the performance, there was a power failure about an hour into the show.