You can figure out how much each appliance costs you per hour of use. We had a discussion on the cost of a Pool and I found a site where you can figure it.
If you wish, you can post the wattage each appliance uses and I can run the numbers.
If you want to do it yourself then here is a simple exercise.
Say an appliance takes 100 watts and you run it 1 hour a day and the cost per kilowatt hour (on your sd&g) is 20 cents per hour.
So 100 watt burning for an hour will cost 1/10 of a kilowatt hour (100/1000) x the rate of 20 cents or say .02 per hour, or 48 cents a day. So if you left if on for 24 hours and 30 days that 100 watt light bulb would be about $15 bucks a month.
Let me know if you want help with it.
John
PS Actually you could set up an Excel spreadsheet to make it easier. Make the columns Appliance, wattage, Hours of use, Kilowats used, cost per Kilowatt, total cost.