200W is probably peak, and of course depends location, time of year and time of day. If we say 50W 24/7 and 10 cents/KWh, we get a saving of about 0.5 cents/h or about $44 per year. That is not enough to amortize the cost of the equipment over any reasonable life span. In addition, you have to run an extension cord to an outlet, virtually all of which are inside.
Nice idea, but it would be mostly a "feel good" thing.
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