My problem with using the meter averages is it does not take into effect peak loads.
Things like spas may not be used very often but it is likely that when they do you might have a house full of kids, the oven may be going, you are using lots of hot water and there may be a load of towels in the dryer ... then someone gets cold and the wife turns on 15kw of toaster wire heat.
Of course every TV, computer and light in the house is on.
