The lights went out Friday afternoon for MidAmerican, Alliant, and REC electric customers.

The power outage happened sometime after 2:30 p.m.

Alliant Energy says the power outages are all related, and it comes from ITC Midwest, which is having a transmission issue.

MidAmerican Energy says they're in the process of switching customers over to other circuits, so they'll have power restored until ITC can make needed repairs.

As of 3 p.m., at least 10,000 MidAmerican customers were without power, and at least 5,700 Alliant customers were left in the dark.

A Linn County REC representative said more than 10,000 of its customers were without power for about 15 minutes. Their power has since been restored.

Coralville Police Tweeted they've got officers helping direct traffic at busy intersections that have no lights because of the outage.

We'll bring you the latest details as they become available.