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SACRAMENTO, Calif. (AP) _ California's power grid managers ordered statewide rolling blackouts Monday for the first time since March, cutting enough electricity for about 225,000 homes. Before the blackouts, the California Independent System Operator had urged conservation because high temperatures in California and the Southwest were pushing up demand for electricity.

In addition, several key power plants were closed for pre-summer maintenance, officials said. Those plants normally would provide enough power for about 9.4 million homes.

Among the plants down for repairs are four nuclear power plants.

The last time California's power crisis caused blackouts was in March.

The ISO declared a Stage 2 alert Monday morning as electricity reserves dwindled to close to 5 percent. A Stage 3 alert, when reserves near 1.5 percent, can prompt the blackouts.

California was hit with rolling blackouts Jan. 17 and 18 and March 19 and 20.