Real-time energy usage readout of electricity used in our house is now available for all to see. Average consumption is approx 3000 watts (3kW). If it increases to approx 6000 watts (6kW) then someone in the household has put the kettle or cooker on for tea! Between the hours of 12.30 - 7.30 GMT Economy 7 starts and in the winter the storage heaters turn on, so expect some high wattage readings between these hours.
Just refresh the web-page to see it change.
I blogged about this here.