Office of the Vice President for Global Communications

Monday, February 25, 2013

Tripped relay in DTE substation causes campus power outage

University and DTE Energy officials say the power outage that affected a large swath of Central Campus on Monday morning was caused when a relay tripped in a DTE substation and interrupted power to the U-M Central Power Plant.

The 30-minute campus power outage began at 9:54 a.m. when the substation problem affected two DTE transformers that feed power to campus. About 4,000 DTE customers in Ann Arbor also were affected.

Because the campus power plant was configured for planned upgrades, the plant was not able to provide immediate backup power, said Henry Baier, U-M associate vice president for facilities and operations.

The Central Power Plant has been restored to normal operations and the DTE transformers are back in service.