Power has been restored to south Calgary after an outage caused traffic chaos south of Glenmore Trail.

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Two power outages knocked out traffic lights south of Glenmore Trail. ((CBC))

ENMAX officials said the second power outage of the day started just before 11 a.m. local time Monday, leaving about 70,000 customers, and traffic lights south of Glenmore Trail, without electricity.

Calgary police posted officers in marked cruisers to help with traffic control at every major intersection south of Glenmore Trail. They reminded drivers to treat uncontrolled intersections as four-way stops.

Calgary Transit reported no C-Train service between the Anderson and Somerset-Bridlewood stations in both directions. Shuttle buses were being used to take users between the two stations.

Ginette Boulianne, ENMAX spokeswoman, said ice fog and other weather issues are likely to blame for a transformer blowing at the Douglasdale power substation at about 7 a.m.

That caused an initial blackout early Monday morning that left 14,000 customers as well as traffic lights in the southeast without electricity.

She said backup power sources that ENMAX normally uses were unavailable because of scheduled upgrade work.

"We have … more transmission lines that are affected than we normally would. One because of the outage this morning, and the second one in the Weaselhead area because of construction work we were planning on starting today," she said.