A Level 2 Hazmat situation was declared Friday night after a fire at the DTE Energy substation at East Forest Avenue and Russell Street in Detroit.
The fire has been put out and the Hazmat has been cleared, but it left about 3,000 DTE customers without power overnight.
DTE said all power was restored around 5a.m. Saturday. The cause of the fire was a failed regulator at the substation.
"Any substation in the city of Detroit we're going to call it a Hazmat, automatically," said a DTE worker.
No injuries have been reported. Police did rescue two people trapped in an elevator at the Ellington Apartments on Woodward Avenue.
Most customers without power were in the Midtown neighborhood.
The substation is called the Garfield Substation.