Best Plug

The Zooz ZEN04 is a compact single-outlet Z-Wave smart plug with built-in power monitoring. It pairs with any certified Z-Wave hub, including Home Assistant with a Z-Wave radio, Hubitat, HomeSeer, and SmartThings, and it reports on/off state, watts, kilowatt-hours, voltage, and amperage without a vendor account or cloud service anywhere in the loop.

The Emporia Smart Plug is a Wi-Fi smart plug built around energy monitoring rather than treating it as a checkbox feature. It is UL-listed, rated for 15 amps, and feeds per-outlet consumption data into the same Emporia app that serves the company's Vue whole-home energy monitors, which makes it the usual pick for people assembling a low-cost picture of where their electricity goes, appliance by appliance.