Why Your Internet Dies When the Power Goes Out
When a Texas storm kills the power, most people assume internet service itself has failed. In reality, the ISP's network is often still running — the problem is that the equipment inside your home has no electricity.
Your internet connection depends on at least two powered devices in your home: your **router** (the box that creates your Wi-Fi network) and, if you have fiber, your **ONT** (Optical Network Terminal — the box where the fiber line enters your house and converts the light signal to Ethernet). Both require wall power. When the lights go out, these devices shut off instantly and your Wi-Fi disappears.
Cable internet users have a modem instead of an ONT, but the principle is identical — no power to the modem means no internet, even if Spectrum's network is fully operational on their end.
The key insight is that these devices consume very little electricity. A typical home router draws 10-15 watts. An ONT draws 10-20 watts. Together they use roughly the same power as a single LED light bulb. This means keeping them alive during an outage is surprisingly cheap and simple — you do not need a whole-home generator just to maintain internet access.
UPS Battery Backup for Your Router and ONT
A UPS (Uninterruptible Power Supply) is the simplest and most cost-effective way to keep your internet running during a power outage. The [APC UPS 600VA Battery Backup (BE600M1)](https://amzn.to/40O2ZAt) is purpose-built for this use case — it costs around $55 and provides 3-4 hours of backup power for a router and ONT combined.
**Setup is dead simple:** Plug the UPS into your wall outlet. Plug your router and ONT power adapters into the UPS battery-backed outlets (not the surge-only outlets — the UPS has both). That is it. When power drops, the UPS switches to battery in under 10 milliseconds — fast enough that your router never reboots and your Wi-Fi stays connected without interruption.
**Runtime math:** The APC BE600M1 has a 330-watt-hour battery. Your router (12W) plus ONT (15W) draw about 27W combined. At that load, the UPS runs for roughly 5-6 hours in practice. That covers most Texas storm outages, which typically last 1-4 hours for urban and suburban areas.
**What to plug in and what NOT to plug in:** Only connect your router, ONT/modem, and optionally one network switch to the UPS battery outlets. Do NOT plug in your desktop computer, monitor, TV, or anything else power-hungry — they will drain the battery in minutes and defeat the purpose. The goal is to keep only your internet backbone alive.
**Fiber vs. cable consideration:** If you have AT&T Fiber or Frontier Fiber, you MUST power both the router AND the ONT. The ONT is often mounted on an exterior wall or in a utility closet — run an extension cord to the UPS if needed. If you have Spectrum cable, you need to power the modem and router (or the modem-router combo unit).
Generators and Portable Power Stations for Longer Outages
When outages stretch beyond 4-6 hours — common during Texas hurricane season and severe winter storms — a UPS alone will not last. You need a way to recharge or a bigger power source.
**Portable power stations** (like Jackery, EcoFlow, or Bluetti units) are essentially large rechargeable batteries. A 500Wh portable power station can run your router and ONT for 15-20 hours continuously. Prices range from $300-$600 for units with enough capacity. The advantage over a generator is silence, no fuel, and safe indoor use. Charge it before storm season and it is ready when you need it.
**Generator sizing for home network:** If you already own or plan to buy a generator for your home, your internet equipment adds negligible load. A router and ONT together draw under 30 watts — a rounding error on even the smallest 2,000-watt portable generator. The real consideration is clean power output. Routers and ONTs have sensitive electronics. Use an inverter generator (Honda EU2200i, Westinghouse iGen2200) rather than a conventional open-frame generator. Conventional generators produce dirty power with voltage spikes that can damage networking equipment over extended use. If you must use a conventional generator, plug the UPS into the generator and plug your network equipment into the UPS — the UPS acts as a power conditioner.
**Solar charging option:** If you have a portable power station with solar input, a 100-200W solar panel can recharge it during daylight hours, creating an indefinite power loop for your networking gear. This setup proved invaluable for many Texas households during Winter Storm Uri in 2021 when outages lasted 3-5 days.
**Runtime comparison:**
- UPS (600VA): 4-6 hours for router + ONT
- Portable power station (500Wh): 15-20 hours
- Portable power station (1000Wh) + solar panel: Indefinite in daylight
- Inverter generator + fuel: Indefinite while fueled
Cellular Backup — Your Plan B When Everything Else Fails
Sometimes the ISP's network goes down entirely — a fallen tree takes out the fiber line to your neighborhood, or Spectrum's local node floods. No amount of battery backup helps when the signal itself is gone. This is when a cellular backup plan saves you.
**T-Mobile 5G Home Internet** ($50/month, no contract) is the easiest dedicated backup. Order it in advance, set up the gateway, and leave it powered off until you need it. When your primary connection fails, power on the T-Mobile gateway and connect your devices to its Wi-Fi network. Because there is no contract, you can pause or cancel anytime. Some Texas households keep it as a permanent second connection for redundancy.
**Mobile hotspot from your phone** works in a pinch but has limits. Most phone plans cap hotspot data at 15-50 GB per month. At heavy household usage, you can burn through that in a day. Tethering also drains your phone battery fast, and you may need that battery for emergency communication. Use phone hotspot for short outages (under 2 hours) and switch to a dedicated solution for anything longer.
**Dedicated mobile hotspot devices** (Nighthawk M6, Inseego MiFi) on a data-only plan give you more control. A Verizon or T-Mobile data-only plan with 100+ GB provides meaningful backup capacity. Keep the device charged and in your network closet alongside your router and UPS.
**Dual-WAN routers** are the premium solution. Routers like the Peplink Balance 20X or TP-Link ER605 accept both a wired WAN (your fiber or cable) and a cellular USB dongle or SIM card. When the primary connection drops, the router automatically fails over to cellular — your devices stay connected to the same Wi-Fi network without manual switching. This is the setup remote workers and home-based businesses in storm-prone Texas areas should invest in.
**Pro tip:** Test your cellular backup during good weather. Confirm signal strength, measure speeds, and practice the switchover. Discovering your T-Mobile gateway gets 3 Mbps at your address during a Category 4 hurricane is not the time to troubleshoot.
Frequently Asked Questions
How long will a UPS keep my router running during a power outage?
A standard 600VA UPS like the APC BE600M1 (~$55) keeps a typical home router and fiber ONT running for 4-6 hours. Your router and ONT together draw about 25-30 watts, which is very low demand on the battery. For outages longer than 6 hours, pair the UPS with a portable power station or generator.
Do I need to power my ONT separately from my router during an outage?
Yes. If you have fiber internet (AT&T Fiber, Frontier Fiber, Google Fiber), your ONT is a separate device that also needs power. The ONT converts the fiber optic signal to Ethernet — without it powered on, your router has no internet signal to broadcast. Plug both the router and the ONT into your UPS battery-backed outlets.
Will my internet work during a power outage if I have a generator?
Yes, as long as the ISP network itself is still operational. Power your router and ONT (or modem) from the generator and your internet will work. Use an inverter generator for clean power, or plug a UPS between the generator and your equipment to filter voltage spikes. Your networking gear draws under 30 watts total — negligible load on any generator.