The amount of electronic appliances we have in a house has risen considerably for the last ten years. At one time we usually only had just a TV-set and stereo. Now, we have also one or two computers, a DVD player, DVR and who knows what else. This situation, of course, impacts our energy bills a lot more than one would think. While all those appliances taken separately use very little electricity, the situation looks quite differently if we sum up all the energy they use collectively.