I never realized that a large amount of money can be saved just by cutting the unnecessary wasted energy costs. I have done a little experiment with the 'MS6115 Mains Power Meter' on my work desktop computer to find out the effect of wasted energy in an attempt to save the company some money by generating awareness. I am pretty shocked with the results to be honest seeing how much energy is wasted every year throughout the world! I have used the Dell Optiplex GX620 Desktop Computer for this Energy usage/cost calculation. MS6115 Mains Power Meter was used to measure energy usage. I have been doing various kinds of experiments with this power meter that i mentioned on my Essential tips to start living Green today post a few days ago. Wasted Energy cost of a Desktop CPU (Dell Optiplex GX620) A desktop CPU running idle with Screensaver consumes about 0.082 Kwh (What is kilowatt-hour, kWh?). Energy Usage for overnight, 5pm-9am, 16 hours (Given an eight hours work day) = 0.082 x 16 = 1.312 Kwh Energy Usage over five working day overnights = 1.312 x 5 = 6.56 Kwh Energy Usage over the weekend = 0.082 x 48 = 3.936 Kwh One working week Energy Usage ...