APSW Watt-U-Use
Have you ever wondered how much money that light left on all night is costing you in bills? Or that stereo that just seems to never stop playing from the kids room? How about which of your household appliances contribute the most to your monthly energy bills? ... Calculates by any two of wattage, voltage, amperage. ... Lets you add any appliance (lights, stereo, washingmachine etc). ... Shows your estimated energy bill for the month, quarter and year. ... Allows for any discounts or rebates on energy bills.
http://www.allpurposesoftware.com/downloads/wattuuse.zip - 4Mb - Download - Screenshot