That time the backup generators "hardly had to run at all," he said.

But by last night, 7,927 customers were still without power, though some will be able to rely on their own backup generators.

She could feel a backup generator there as well, but no other power source.

Although there is a backup generator, it has never been needed.

The backup generators would be more than enough to contain the atmosphere.

"I figured something was up when the lights went out and the backup generator failed, too."

"I forget, does it have some sort of backup generator?"

One hospital was left without power for two hours when its backup generator failed.

When the power went out, a backup generator kept the hospital going at first.

In case of a blackout, the university has a backup generator.