Energy cost was estimated by the following equation: Cost($/day) = E(kWh/day) × Cost(cent/kWh), where E= 0.018 kWh/week, and Cost= Northern Nevada is about $0.118 kWh/hour. Electricity was estimated at 24 watts operating at 0.75 hours/week for a total energy usage of 0.018 kWh/weeks x 52 weeks/year x $0.118 kWh = $0.11.