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Pockets of the city were blacked out because the demand for power caused some equipment to overheat and two transformers in North York were struck by lightning, Toronto Hydro said.
Some stores, restaurants and movie theatres were forced to close for more than two hours when the power went out in a section of Yorkdale Shopping Centre on Dufferin St. at Highway 401.
Toronto Hydro said transformers at Jane St. and Finch Ave. W. and Dufferin St. and Finch Ave. W. were struck by lightning around 6:30 p.m. The lights came back on in the mall just before 8 p.m.
In Scarborough, the area of Finch and Pharmacy Aves. also experienced a blackout.
A spokesperson for Toronto Hydro said the problems came from transformers that overheated and needed repair. There were no problems with generating power, she said.
There's no relief in sight from the heat, Day 12 of Ontario's second-longest June heat wave.
At 5 p.m., the Independent Electricity System Operator recorded 25,816 megawatts flowing down the wires, down from the record high of 26,157 on June 27.
Toronto's health department has declared an "extreme heat alert," meaning that vulnerable people could die without proper precautions.
Metro Hall and the former civic centres in East York, Etobicoke and North York were open to the public as emergency cooling centres.
Southern Ontario will get some relief from the heat wave June 30, when temperatures are expected to dip below 30C. On Canada Day, it will be 26C, with the trend continuing on July 2,3.
Another warm front will push in to raise temperatures as people head back to work July 4.
Long-range forecasters are predicting hot and dry weather through July and August.
Ontario's chief conservation officer, Peter Love, urged Ontarians to turn off the lights, raise the temperature on their air conditioners and try to use appliances after 8 p.m.
Ontario Premier Dalton McGuinty said his family air conditioner broke two weeks ago and he was told it wasn't worth fixing.
"So I had to get in line to buy a new one." he said.
Meanwhile, Ontario Power Generation won a permanent injunction against striking Society of Energy Professionals at Hydro One, the province's energy distributor.
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