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Do you have any kind of source on that? I've lived in Arizona all my life, and the only rolling brownouts I've experienced and heard about have been in California. Who I believe already buy surplus power from AZ.

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I lived in Prescott Valley, and several years in a row saw brown/blackouts in mid-summer. Also saw them a number of times in the Peoria & I-17 area in phx (closer to cactus)

I've seen outages lasting a couple hours from components like transformers breaking, but that's a different issue from the grid itself not producing enough power to meet demand. Can't speak for Prescott Valley though.

Interestingly, the only article on a Phoenix area blackout due to high load I was able to source happened in the winter... probably caught SRP totally off guard:

http://www.azfamily.com/news/local/Rolling-blackouts-sparked...

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