(CNN) Thousands of Los Angeles residents were left without power Saturday morning after a heat wave prompted high electricity demand throughout the city.

"Friday's record-setting heat led to unprecedented peak electricity demand," according to the Los Angeles Department of Water and Power (LADWP). High demand caused power outages throughout city and left 34,500 customers in the dark -- without fans or air conditioning.

The department said that figure accounts for about 2.5% of their 1.5 million customers.

Scorching heat has descended upon California and parts of the southwest after a heat wave swept across Canada earlier in the week, killing dozens in the province of Quebec , according to Canadian health officials.

Many areas in California on Friday broke their daily high temperature records, according to CNN meteorologists. Downtown Los Angeles reached a high of 108 degrees, breaking its previous daily record of 94 degrees, which was set in 1992.

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