Yes, getting the Sense Home app and your smart meter connected to your home’s Wi-Fi is necessary to provide you with the powerful, personalized home energy insights you expect from us.
Sense’s Wi-Fi requirements are no different from many other IoT devices you may already have in your home, such as having a modern Wi-Fi router and strong signal strength between your electric smart meter and the router.
This article, Is my home's Wi-Fi compatible with Sense? tells you more about the Wi-FI requirement.