Be Prepared for Power Outages

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Stay connected even when the power is out

Your TWC-provided phone modem (known as eMTA) is powered by plugging it into an electrical wall outlet. In the event of an electrical outage, your modem will not receive power, just like a cordless phone, lamp or any other electrically powered device in your home. In this case, your TWC Phone service, including any medical or security alert services (like E911), will not be available.

There are several steps you can take to prepare for a power outage in your home, which may help you maintain phone service:

  • If you have a cell phone, ensure that it is fully charged. Keep a car charger handy for situations where electrical power is not available.

  • A UPS (uninterruptable power supply) is a power source that will continue to work for a period of time during a power outage. Connecting your modem and cordless phone to a UPS may help you maintain service for a limited time in the event of a power outage.

  • A backup battery for your TWC-provided phone modem (eMTA) may help you maintain service during a power outage for a limited period of time. However, it will not maintain your phone service in the event of a TWC network outage, and it will not power a cordless phone.

  • Even if you have a backup battery installed in your modem, your cordless phone may lose power during an outage. Consider having at least one traditional telephone handset in your home (not a cordless phone) that plugs directly into the telephone jack on your modem.


Your TWC-provided phone modem includes a backup battery option to help maintain your service during a power outage for a period of 8 to 24 hours, depending on the model you purchase. Although Time Warner Cable does not provide backup batteries, you may purchase one from the modem manufacturer.

Select your modem manufacturer from the list below to learn more about how to purchase a backup battery:


  • Motorola

  • Ubee

  • Technicolor: (Coming soon. Please check back.)

  • Cisco/Scientific Atlanta: (Backup batteries not available for purchase.)

Here are some tips on how to get the most out of your eMTA:

  • Do not expose your battery to extreme temperatures, which can substantially shorten your battery’s life.

  • During an extended outage, use your Phone and Internet service sparingly to preserve your battery life.

  • Check your battery’s condition twice a year. An indicator light on the front of your modem lets you know that your battery is charged and operating properly. To check its condition:
    1. Unplug the modem power cord from the wall.

    2. Verify that you have a dial tone on your phone.

    3. If you do, your battery is working.


See Residential Service Subscriber Agreement. Our cable modem is electrically powered, and TWC Phone service, including home security services, may not operate in the event of a power outage. If a power outage occurs in your home and if your cable modem is equipped with a battery, it may enable backup service for a limited period of time or not at all, depending on the circumstances. If your local TWC system loses power or experiences other service issues, the battery in your cable modem, if any, will not provide backup service and TWC Phone will not be available.

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