Hello!
I wanted to create this post to see if I can get an answer, as google seems to give mixed results. This winter, I was thinking of getting a small generator incase our power goes out. We live in a rural area, so I have propane for heat, but was more worried about keeping devices charged and some lights.
I was curious if we had a power outage, if I powered my modem- would I still be able to have internet access? We have Xfinity but I wasn’t sure if there is a total power outage, if the internet would go down either until the local system is brought back up or if it had batteries/self generators so the network stays up during an outage.
I went through this same thing. I bought an APC uninterruptible power supply and keep the modem and router plugged into. Also routing coaxial and Ethernet cables through it so it is 100% connected to the PSU. if power went out we were still able to maintain internet and charge our devices for several hours. However this is negated if there is an outage with your ISP. So yes and no. But for my experience it has been mostly yes to having Internet during a power outage.