Heat wave prompts 2nd day of statewide Flex Alert

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SAN DIEGO - Another Flex Alert urging residents to voluntarily conserve electricity to ease demand on the statewide power system will take effect Wednesday afternoon.

The Flex Alert issued by the California Independent System Operator, which manages the statewide power grid, will take effect at 2 p.m. and will remain in force until 9 p.m. It was in effect during the same hours Tuesday.

County sets its new record-high temperature Tuesday

Cal-ISO officials urged residents to make an extra effort to conserve during late afternoon hours, when air conditioners tend to be used most. The agency predicted peak usage on Wednesday to exceed 46,600 megawatts, and noted that widespread air-condition use can put strain on the electrical system.

According to Cal-ISO's website, electrical demand late Tuesday afternoon topped 44,000 megawatts. The highest demand ever recorded by the system was 50,270 megawatts, which occurred on July 24, 2006.

A Flex Alert is issued when the electrical grid is "under stress," generally from increased power usage due to hot weather.

Cal-ISO officials urged residents to take steps such as:

-- setting thermostats at 78 degrees or higher;

-- close drapes and use fans to cool rooms;

-- turn off unnecessary lights and appliances; and

-- delay using major appliances until early in the morning or late in the evening.

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