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With an extreme heat wave continuing across California, officials said more rolling blackouts are ‘imminent’ Tuesday as state officials struggle to secure additional electricity amid the worst power crisis in nearly 20 years.

On Tuesday afternoon, the California Independent System Operator, which runs the electric grid for most of the state, declared a Stage 2 emergency — one of several it has issued over the last week — asking customers to save energy in order to avoid rotating power outages later in the day.

On Monday, officials had warned of blackouts affecting as many as 3 million people, but officials ended up canceling the warning, saying improved weather conditions and conservation efforts reduced demand on the power grid.

“We are grateful to families and businesses across the state that answered the call to reduce electricity use during a crucial time on the grid,” Steve Berberich, the president of the California Independent System Operator, said in a statement.

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