Updated: Tue Dec. 01 2009 14:55:38

CTVcalgary.ca

Enmax is still looking into the cause of an early morning power outage in northwest Calgary.

The lights went out for people living in the communities of Royal Oak, Tuscany, Rocky Ridge, and Arbour Lake shortly after 6 a.m. Tuesday morning.

Officials say the power was restored to most customers in about 40 minutes.

But about 500 homes and business were without power until about 9 a.m.

It's not believed the outage is weather-related but crews are still investigating the cause.