at 9 cents per kilowatt hour of electric power analyze how much money you would save in a year (365) if you went from non-energy efficient to energy efficient appliances. Calculate how much per appliance and then a grand total of your savings. appliance: washing machine usage per day: 1 hour, watts per hour:3000 watts. washing machine: usage per day 1 hours. watts per hour 1500 watts. Refrigerator usage per 24 hours, watts per hour 100. Refrigerator usage per 24 hours, watts 75. dishwasher usage per day 1 hour, watts used per hour 1500 watts. Dishwasher usage per day 1 hours, watts used per hour 1200 watts.