What fails first when the grid goes down

Finton Field Guide ยท 2026-10-31

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Most of modern life runs on electricity, and most of it has only hours of backup power, if any.

A 2012 National Academies report on the U.S. power grid looked at how other critical services hold up when the power stays off. The pattern is clear: a few systems have days of backup fuel, many have hours, and a surprising number have none.

SystemTypical backup in a long outage
Gas station pumpsMost have no backup
ATMsTypically no backup
Card readers at storesLittle or no backup at most retail outlets
Cell serviceBatteries typically last 2 to 8 hours
Pharmacies and clinicsMany have no backup
City water and sewerLimited backup; pumps need power
HospitalsFull backup for critical care, often planned around 24 hours of on-site fuel
Major radio stationsSeveral days of fuel

Source: National Academies, Terrorism and the Electric Power Delivery System (2012).

What that means for your household

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Sources

This guide is general information for preparedness. Follow official guidance and your local emergency managers, and call 911 in an emergency.

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