06/25/2013 10:00 EDT | Updated 08/25/2013 05:12 EDT

Power returns downtown for up to 8,000 customers

Lights are back, as is air-conditioning, for thousands of downtown Toronto customers who woke up to widespread outages this morning as the city remains under an extreme heat alert.

Toronto Hydro confirmed shortly after 9 a.m. that power and electricity for some 6,000 to 8,000 customers downtown have their electricity back, although some pockets of the city may still be experiencing outages. The blackouts affected an area bordered by Queen Street East and the Esplanade between Bay Street and George Street.

Toronto Hydro said does not know what caused the outage, but that it took about an hour and a half to restore power.

A second outage, affecting about 100 customers, was reported in an area bordered by Dundas Street East, Kingston Road and Coxwell Avenue.

Power outages have been reported to CBC News in other areas of the city, including Don Mills and the Beach.

The power outages caused some problems for drivers in the downtown core, as many traffic lights were not operating.

Toronto Fire reported seven calls between 8 and 9 a.m. for elevator rescues.