Buy electric power monitors
The Kill a Watt Elctric Power Usage Monitor is a cheap (~$20), easy to use product that monitors the electricity use of whatever is plugged into it.
The PowerCost Monitor monitors power use for your whole house, and tells you in real time how much it is costing you.
You should be able to pay for either of these with the amount you save after you realize how much power you are wasting!
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