whatwatt

whatwatt is a Swiss company that helps households make sense of their electricity use. By connecting to your utility meter, it turns smart meter data into real-time insights that help you cut costs, improve efficiency, and fit naturally into your smart home

Real-Time Energy Data with whatwatt Go

The company’s flagship product, whatwatt Go, is a compact adapter that connects to your electricity meter. It supports common European standards, such as P1, M-Bus, and HAN, so it works with meters from brands like Landis+Gyr, Kamstrup, Sagemcom, and Iskraemeco. Once connected, it delivers live readings of your household’s consumption and solar production.

whatwatt Go connects to your network over Wi-Fi or Ethernet and offers open interfaces like MQTT and REST, so it’s easy to integrate with other systems. Instead of waiting for monthly bills or estimates, you get a live view of your energy use. This makes it easy to spot peak loads, track solar self-consumption, and uncover hidden standby usage.

Homey × whatwatt

When paired with Homey, whatwatt Go turns raw energy data into actionable insights. Homey Energy shows exactly where your electricity is going across appliances and devices, while Homey Insights stores historical data so you can track patterns over days, weeks, and months.

This integration also enables smart automations. You can create Flows that respond in different ways. For example, pause energy-hungry appliances during peak hours, start EV charging only when your solar panels produce surplus power, or dim non-essential lighting when consumption crosses a set threshold. You can even receive notifications when background usage is unusually high, helping you track down wasteful devices.

With whatwatt and Homey working together, your home gains real-time awareness of energy consumption, so you can save energy, reduce costs, and live more sustainably.