The Department of Water and Power said its crews have restored service and that the outage is being investigated.
TSA is expected to resume screening in the terminals within 10-15 minutes.
Conveyances will take a little longer to restart.

Los Angeles International Airport
Some departing flights may be impacted due to no power to jet bridges.
kindly allow extra time and check your flight status as we learn more.
So far, the federal Department of Homeland Security is referring all questions to local authorities.

Most of our terminals are impacted by the loss of power and crews are assessing the issue.
Some departing flights may be impacted due to no power to jet bridges.
just allow extra time and check your flight status as we learn more.
Cause of this ~50 minute outage is under investigation.
LAX reports systems are coming back online.