Cell towers have a backup power deadline

PG&E cut power to about 7,800 customers across 10 counties on July 15 — the utility’s third Public Safety Power Shutoff of the year. Calaveras and Tuolumne weren’t on that list, but both counties sit in the same Tier 2 and Tier 3 high fire-threat districts PG&E uses to decide who goes next when wind, low humidity, and dry fuel line up. That puts a shutoff reaching the Highway 4 or Highway 49 corridor well within reach this season — worth planning around before an outage starts, not after.

The backup clock

A 2020 California Public Utilities Commission decision requires wireless carriers to keep cell sites in Tier 2 and Tier 3 high fire-threat districts running on backup power for at least 72 hours after the grid goes down — enough to hold 911 access, emergency alerts, and basic connectivity through a typical shutoff. That is a real, enforceable floor.

It is also just a floor. PG&E’s own July 15 shutoff notice is candid that outage length depends on real-time weather, damage assessments, and the patrols and repairs needed before lines are safe to re-energize — and in steep terrain, that inspection can take longer than flat ground. When a shutoff runs past 72 hours, the backup clock at the cell site runs out before the grid comes back, whether or not anything else goes wrong.

What closes the gap

None of this needs to be solved in the moment. A few things are worth having ready before a Red Flag forecast, not after the outage starts:

A battery or hand-crank radio that receives NOAA Weather Radio or standard AM/FM. It pulls official alerts straight off the air, with no cell tower, account, or app in the chain.
A charged battery bank or a small solar panel, topped off ahead of a forecast wind event rather than found dead when the power drops.
A GMRS radio. The FCC license is a flat $35 for ten years, with no exam, covers an entire household under one callsign, and talks radio-to-radio between family, neighbors, and vehicles without touching the phone network at all.

PG&E posts a rolling 7-day PSPS outlook and address-level shutoff status once a watch is called — that page is the one to check as conditions build, not a blog post written days or weeks ahead of the next event. The backup-power window is generous. It is still a window, and the plan for what happens after it closes is the part worth having ready now.