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great article, but there are more severe problems you can find with a wattmeter (not voltmeter as stated in the article)
and some times there are simple means to solve them
adding extra insulation to a boiler can reduce power-consumption significantly
So these rates actually work ? I see why electricity companies make electricity cheaper at night, but I've always wondered if it was an effective way to make people turn power-savvy devices on at night.
Anyway, if I may add my own computer-unrelated advice... During the winter, make sure that heaters only heat when you are at home, and heat up less during the night. One actually sleeps better if the house is at 15-17°C, although you get cold mornings as a counterpart. Edited 2011-08-03 08:49 UTC