More than half the electricity customers who lost power Wednesday across southeast Michigan are still in the dark this morning.

Thousands of workers, including many from out-of-state, are working non-stop to restore power to about 400,000 DTE Energy customers and 100,000 Consumers Energy customers, according to Friday-morning updates from the companies.

"DTE expects to have roughly 90% of customers restored by Sunday evening. DTE recognizes this event is difficult for customers and asks for your ongoing patience," DTE Energy said in a news release.

The utility said it expects to restore power to about 200,000 customers by the end of today.

The company reports more than 9,000 downed power lines from tree damage. It has crews including more than 1,800 linemen, and 700 contractors and workers from other states, along with 700 tree trimmers cooperating to restore power.

Consumers Energy reports that the "vast majority" of customers without power should have service restored by midnight Saturday.

"In some of the hardest areas, including portions of Genesee, Kent and Kalamazoo counties, restoration work will continue into Sunday," according to Consumers Energy.

People are advised to stay at least 20 feet away from all downed power lines and anything they contact. Every downed power line should be treated as if it is energized, and residents should not cross yellow caution tape, according to DTE Energy.

Contact Robert Allen on Twitter @rallenMI or