The energy breakdown feature in Insights+ shows you how much energy each of your smart plugs have consumed. You can choose to view this data in either kWh or £. Specifically, smart plug measures the current that is passing through it, and reports it back to the Wiser Hub. With the known voltage from mains we can calculate easily what the power in Watts was at any given time, and translate it to energy in Watt hours. If we know your tariff, we can show you the energy in £.