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Estimating that my computer draws 80W...
80 W * (8760 hr / 1 yr) * (1 kW / 1000 W) = 700.8 kWh / 1 yr.
(700.8 kWh / 1 yr) * (1 yr / 12 months) = 58.4 kWh / 1 month.
(58.4 kWh / 1 month) * ($0.079800 / 1 kWh) = $4.66 / month.
The price per kWh ($0.079800) varies monthly...
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