Will My Internet Work During a Power Outage?

The chain nobody explains

Between your laptop and the internet there are several links, and every one needs electricity:

You control the top two. The third is the one that decides your outcome, and you'll never know its state until it fails.

Your half is trivially cheap

A router and modem together draw around 20 watts. verify

Even the smallest unit here runs your internet for most of a day. There is no cheaper win anywhere in backup power.

The test that tells you whether any of this matters

Next time the power goes out, run the router off a battery and note how long the connection actually survives.

That number tells you more about your specific ISP than any article can.

Dies in two hours? Your neighbourhood node has a small battery. Powering your router is nearly pointless — buy a phone power bank instead.

Still up after eight hours? Your ISP has solid backup. Powering your router is genuinely worth it.

The alternative most people should try first

A phone hotspot.

Cell towers generally have their own backup power and often stay up longer than home internet infrastructure. A phone plus a decent power bank costs a fraction of anything else and works when your home connection doesn't.

For checking on family and looking at the outage map — which is what most people actually need — that's the better answer.

Keep the home-router plan for things that need a real connection: remote work, security cameras, a medical device that phones home.

Two things worth knowing

Fibre is not automatically immune. The glass carries light and needs no power, but the ONT box in your house does, and so does the equipment at the other end.

An old copper landline usually survives, because it's powered from the telephone exchange rather than your house. A modern VoIP phone running through your router does not — it dies exactly when your internet does.

If someone in your home is medically vulnerable, that distinction is worth checking before you need it.

By connection type

Which link in the chain fails first depends entirely on what you have.

Two rows change people's plans.

Starlink does not care whether your street has power. Its weakness is appetite — the dish draws roughly 50–75W, several times a normal router, so the same battery lasts about a third as long.

5G home internet and phone hotspots share the cell network, and cell towers are generally the best-backed-up infrastructure in this list. If your home connection dies in two hours every time, the answer is not a bigger battery.

What to do during a long outage

Assume the connection will go and plan around the phone.

Download before it drops. Offline maps for your area, any documents you need, and enough entertainment for the kids. Do this when the lights go out, not when the connection does.

Switch the phone to low data mode and stop background app refresh. You are rationing both battery and data.

Text rather than call. Texts queue and retry on a congested network where calls simply fail — and in a regional outage the network is congested.

Know your hotspot password before you need it. This sounds trivial and it is the thing people cannot find in the dark.

Check whether your carrier has a backup plan. Some offer free data during declared emergencies.

Should you buy anything at all?

For a lot of households, honestly, no.

If your connection dies within an hour or two of the grid regardless of what you do, a battery for the router solves nothing. A phone hotspot and a power bank is the whole answer, and it costs very little.

Buy a battery for your internet if: your ISP demonstrably stays up for hours, you work from home, or something in the house genuinely needs a connection — cameras, a medical device that phones home, an alarm system.

Do not buy one if: you have not yet run the test above. It costs nothing and it settles the question.

If the test says yes, the sizing is straightforward — a router and modem draw about 20W, so even a small unit runs them for most of a day. And if you are looking at a purpose-built modem battery, compare it on watt-hours first; the dedicated boxes usually lose to a small power station.

The short version

Powering your router costs almost nothing and takes almost no battery. Do it.

Just don't assume it guarantees you're online — and test how long your ISP actually lasts before you build a plan around it.