Most people think: “In an emergency I’ll just quickly go to the supermarket.” That is a dangerous misconception. Here is what really happens — minute by minute.
Minutes 1–15: Chaos Starts Immediately
When the power goes out, the following happens in the supermarket immediately:
- Registers go down — no card payments, no checkout system
- Automatic doors stop working
- Lighting: emergency lights run briefly, then darkness
- Refrigerated shelves begin to warm up
Most supermarkets close immediately when the registers go down — if only for theft prevention. No power = no security cameras = no registers = store closed.
Hours 1–3: Panic Buying and Empty Shelves
The few supermarkets still open (cash-only operations) or just opening are immediately rushed.
What sells out first (based on historical events):
- Bottled water — within minutes
- Bread — within 30 minutes
- Milk, eggs — within 1 hour
- Canned goods and dry goods — within 2–3 hours
- Batteries, candles, flashlights — immediately
Hours 3–24: Supermarkets Stay Closed
After the initial panic buying:
- Restocking doesn’t happen — logistics and warehouses need power too
- Refrigerated goods (meat, dairy) spoil and must be discarded
- Supermarkets barricade themselves against potential looting
- Staff are sent home
The reality: Anyone who isn’t at the supermarket within the first 30–60 minutes will leave empty-handed.
What if You Have Cash? Some supermarkets have backup generators and accept cash. These become the target of hundreds of people simultaneously in the first few hours. Even with cash and an open store: the most essential products (water, canned goods) are gone within minutes.
The Bottom Line: You Cannot Go Shopping During an Emergency
That is the most important sentence in this article. When a blackout actually hits, the supermarket is not an option.
The only solution: Be prepared beforehand.
What you need:
- Food supply for at least 72 hours → Emergency Food Supply: The Complete List
- Water supply + water filter → Water Filter Review
- Cash at home
👉 Blackout Checklist: Be Prepared Before It’s Too Late →
👉 Download the Free Instant Checklist as a PDF →