Those communities are Calistoga, Angwin and Mount Veeder.
PG&E says there's a high concentration of trees near power lines in those areas, which increases the likelihood of public safety power shutoffs (PSPS).
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The utility did not say exactly when to expect the outages to happen, just that residents should be ready throughout this summer and fire season.
You can check out our post for tips on how to prepare here.
VIDEO: What to do right now to prep for a planned power outage