Amazon links are affiliate links: as an Amazon Associate I earn from qualifying purchases, at no extra cost to you. Links to makers' own stores and other retailers are plain links that earn me nothing.
Quick verdict
The go-to local-first whole-home energy meter. The Pro 3EM measures three phases at about 1% accuracy and exposes everything over a local RPC/MQTT API, and Home Assistant's Shelly integration (one of its best-maintained) auto-discovers it and wires straight into the Energy dashboard. Matter is supported but only exposes limited energy data versus the native integration, so stick with Shelly local. Note the standard model uses 120A clamps; larger services want the pricier Pro 3EM-400.
Standout: A DIN-rail 3-phase energy meter with a local HTTP/RPC + MQTT API and a top-tier Home Assistant integration that feeds the Energy dashboard directly - no cloud.
Notes last checked Jun 7, 2026.
Compatibility snapshot
Home AssistantexcellentFull local control, no cloud needed. Native Home Assistant integration or a local protocol.
Apple HomenoneNo official support on this platform.
Google HomeokayWorks, but with limits or extra setup.
AlexaokayWorks, but with limits or extra setup.
Works offlineyes
Setuphard
Extra hub neededno
PowerAC-powered
Local control facts
Home Assistant: shelly integration, Local Push, Platinum on the quality scale (home-assistant.io, checked Oct 10, 2026)
Matter: certified (csa-iot.org, checked Nov 6, 2026)
Why it stands out
Official, top-tier local Home Assistant integration that feeds the Energy dashboard directly
Open local API surface (HTTP/RPC, MQTT, WebSocket, Modbus) with on-device data storage
True 3-phase measurement at about 1% accuracy, with both Wi-Fi and wired Ethernet
Reasons to hesitate
Standard model is capped at 120A CT clamps (need the pricier Pro 3EM-400 for larger services)
Matter exposes only limited energy data compared with the native Shelly integration
Whole-home energy monitoring on the Home Assistant Energy dashboard, fully local
Shelly and local-first users who want an open API
Avoid if
You only need a single-circuit plug-in monitor
You are not comfortable working inside an electrical panel
Privacy and local-control notes
A Gen2 device with a local HTTP/RPC + MQTT API; the official Home Assistant Shelly integration talks to it directly with no cloud. It can store roughly 60 days of 1-minute data on-device.
Home Assistant support: supported · integration path: Shelly (local RPC).
Buying reality check
Price notes: Around $130-$155 street for the standard 3x120A model. The 3x400A Pro 3EM-400 is higher (about $330).
Verified price reads: lowest seen $123.99, latest $153.33 on Nov 7, 2026.
Black Friday 2026 smart home deals for Home Assistant and local-control homes: the lowest price I've recorded for 100+ Zigbee, Z-Wave, Matter and Wi-Fi devices.
From the change log and the news briefs that name this product.
Smart home gifts for the Home Assistant enthusiast
Gift ideas for someone who already runs Home Assistant, chosen so they join a radio the recipient already has, need no new account, and carry no subscription.
Black Friday smart home deals for Home Assistant: the prices to beat
Black Friday 2026 smart home deals for Home Assistant and local-control homes: the lowest price I've recorded for 100+ Zigbee, Z-Wave, Matter and Wi-Fi devices.
