If you have fiber internet, your connection relies on an optical network terminal (ONT) in addition to the router. Turning it off for a few hours can cause some issues for a bit when you turn it back on, it'll stabilize again after another few hours but the router uses very little energy, like an absolutely tiny amount, so you wouldn't be saving more than a few pence per month even if you left it off every day. The good news is, your internet service is likely still active; it's just your modem and router that have lost power. This guide will walk you through simple solutions, from small battery backups to powerful portable power stations, that can keep your home network running smoothly through any. Your WiFi router, like any other appliance in your home, will turn off when the power goes off – preventing you from accessing the internet unless you have some type of backup power, such as a UPS (uninterrupted power supply) device, a battery inverter, or a generator. Inverters and generators are. Wi-Fi routers need a power source to function, meaning Wi-Fi cannot work without electricity. If you're used to electric or electronic products of the. Fiber optic internet doesn't use a modem.