Diagnosis
This is a double-whammy. First, your Nest Wifi likely booted up faster than your modem, so it started without a real internet connection. Second, many smart home devices (IoT) are finicky and only connect to the 2.4GHz band. After a reboot, the router might broadcast its 2.4GHz network slightly later, and those devices give up trying to reconnect.
How to Fix It
Follow a specific power-up sequence. 1) Unplug your modem and Nest Wifi Pro router. 2) Wait 30 seconds. 3) Plug in your modem only. Wait for all its lights to settle into their normal “online” state (this can take 2-3 minutes). 4) *Now* plug in your Nest Wifi Pro router. Wait for it to pulse white. This ensures it gets a clean internet connection from the start. For the stubborn smart devices, you’ll likely need to power-cycle them too (unplug smart plugs, light bulbs, etc., wait 10 seconds, plug back in).
If That Didn't Work
The system’s IP address space may have changed. In the Google Home app, go to Wi-Fi settings > Advanced networking > DHCP IP reservations. If you had any reservations set up for devices, check they’re still there. If not, the power outage might have reset a temporary glitch, and things may just need more time (sometimes up to an hour) to fully repopulate.
Heads Up
Consider a small UPS (battery backup) for your modem and main router. Even a basic one will keep them online through brief outages and prevent this whole reboot dance. It’s the single best thing you can do for network stability if you have a lot of smart home gear.