What Happens to Your Internet When the Power Goes Out?

Your Wi-Fi will probably go down if you’re in a power outage without a backup power source, but the internet itself will probably stay up, at least for a few hours.

If you live in an area where power outages are short and rare, the best way to stay connected in a power outage is to invest in a battery backup for your home internet equipment.

Longer or more widespread outages may take out the internet coming into your home too.

Let’s break down why your home network drops while the broader internet often stays online.

Why your internet fails (or stays up)

A working Wi-Fi signal requires electricity at several points between you and the websites you want to reach. If power fails at certain critical steps along the way, you won’t have service.

However, the internet itself is engineered for resilience. Data moves across a decentralized infrastructure where traffic can dynamically re-route around points of failure, keeping the web accessible even during large-scale service interruptions.

Powering your home internet equipment

You can’t control network infrastructure outside your home, but you can control your home internet equipment. All the following devices need electricity to work:

• Your modem or fiber ONT (optical network terminal)
• Your gateway or router
• Mesh nodes or Wi-Fi extenders throughout your home
• Your device (smartphone, tablet, laptop, or console)

Often, power failure to one of these devices is the reason you can’t reach the internet in a power outage. Beyond your home, however, the broader infrastructure relies on consistent power at each step, creating discrete points of failure where an outage can sever your connection.

How it all works (and how well it works) depends on your internet type and the quality of your provider’s infrastructure.

Why your internet tech type matters in a power outage

The internet coming into your home usually stays up in a power outage, assuming that whatever took down the power didn’t also take down your local cables. But some internet types are more resilient than others.

Fiber internet: Fiber cables don’t need power to transmit data, and fiber infrastructure is newer and stronger than other types of cables. In addition, most residential fiber runs on PON (passive optical networking) architecture, which is passive between the provider’s hub and your fiber jack. There are no powered splitters, nodes, or amplifiers in the field at all, so there are fewer points of failure. Fiber-to-the-home (FTTH) connections almost always work in power outages.

Cable internet: Even if you get internet to your home via coaxial cable, most of the network is built on fiber. That makes cable internet nearly as resilient as fiber in power outages, but signal transmission over coax still requires power, so neighborhood nodes need power. Most have a few hours of battery backup, but there are still more points of failure than with pure fiber internet.

5G home internet: Internet services like T-Mobile 5G Home Internet, MINTernet, and Verizon 5G Home Internet use excess capacity on local cell towers, so you’ll keep getting a signal if local towers are up. Even if one tower goes down, your signal will be rerouted to a more distant tower. However, speeds could slow considerably due to network congestion.

DSL: If you have an old DSL connection that connects your home via copper wire, it will probably work in a power outage (just like a landline phone). However, the cables are likely to be old and may not be in good working order. They may also be strung on power lines instead of buried in the ground, making them more susceptible to weather-related problems.

Satellite: There’s a tiny possibility that the ground stations used by satellite internet providers lose power, but it’s rare enough that you shouldn’t worry. Instead, focus on powering your router and your satellite receiver dish (usually powered through the router by way of the Ethernet cable).

How to plan for resilience

Planning to keep your home network up during a power interruption depends on how long you expect the outage to last and how critical it is that you stay connected.

For simple networking gear, you can stick a mini-UPS (uninterruptible power supply) on your gear shelf. A standard UPS (the type you typically see connected to desktop computers) provides more versatility for multiple devices.

If you need power that moves with you, consider a power bank for small devices, a portable power station if you need several hours of power (and multiple ports) or a whole-home UPS for larger equipment.

If power outages are frequent and could last days, consider a whole-home generator so you can keep your AC and refrigerator running while you wait for restoration.

Here’s about how much you’ll need to budget for each backup power solution:

• Mini-UPS: $30–$80
• Standard UPS: $80–$300+
• Power bank: $20–$100
• Portable power station: $200–$2,000+
• Whole-home UPS: $10,000–$25,000+
• Whole-home generator: $6,000–$15,000+

When a backup internet connection makes sense

Smartphones with a good mobile data plan are good enough to get most people through short power outages, but you may want to consider backup 5G or satellite internet if staying online is a necessity.

Backup 5G home internet is available from many of the biggest internet providers, and in some cases, it comes with short-term backup batteries. It’s free with some plans, and costs $7–$20 per month with others. If your provider doesn’t offer it, you can buy a router with 5G backup capability.

Here are a few Wi-Fi 7 routers we’ve tested that include cellular backup support:

• ASUS RT-BE96U
• ASUS ZenWiFi BQ16 Pro
• Amazon Eero Pro 6

If you’ll be in an area that doesn’t get good 5G coverage—or in an area where a disaster could take out the local towers—consider a satellite home internet backup option such as the Starlink Mini.

My take: Plan ahead, but don’t lose perspective

When the power goes out, think about safety first. If having a connection to the internet is vital, think first about getting backup power for your home networking equipment. But for a lot of people, checking Facebook or replying to that work chat just isn’t a high priority.

Text your loved ones to let them know you’re safe, then crack a book or play a board game by candlelight. The internet will be there waiting for you when the power comes back.

Nobody knows your life better than you, so it makes sense to plan ahead. But don’t get overwhelmed with worry, and don’t sink your life savings into a whole-home generator if you aren’t in a high-risk zone for wildfires or hurricanes.

For more, check out our guide on how to prepare your tech for a natural disaster.

FAQ about internet service and power outages