Owl Wireless Electricity Monitor
See www.theowl.com/index.php?page=about-owl. This device gives you real-time readouts of actual electricity consumption in KW, cost in Rands, and also greenhouse gas emission impact. The wireless panel above can be carried around the house as you switch devices on and off to see what the impact is. he transmitter unit just has a clamp that is clamped over the red wire on the main distribution board (no electrician needed). There is also a customisable alarm that can alert you to high usage. There is also another OWL product that allows USB connectivity to your computer for a full analysis of usage (but computer has to stay on). See my newer wireless electricity monitor at www.flickr.com/photos/dvdmerwe/3867302082/.