Smart faucets get their power from batteries placed in a unit under the sink or plugged directly into an AC power outlet under the sink. It stands to reason that if you’ve got a battery-operated smart faucet, it will still receive power if there’s an outage, whereas a plug-in unit wouldn’t. It’s important to note that a house-wide power outage will likely also cause your Wi-Fi router to lose power. You may also lose some smart functionality through the connected app if you lose Wi-Fi.