100 watts / 1000 (watts per kilowatt) * 24 hours (per day) * 30 days (per month) * $0.15 (cost per kilowatthour in tier 1) = $10.80 / month
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100 watts / 1000 (watts per kilowatt) * 24 hours (per day) * 30 days (per month) * $0.15 (cost per kilowatthour in tier 1) = $10.80 / month