I am trying to finish the baseline model to verify that I have the peak demand charge logic correct. Because I am trying to model just the residential loads, it is very interesting to see the effect of a small change in pricing on a month’s profits. I was using the system wide average price which included all customer classes (industrial, commercial, residential, a couple of special classes). Small changes to the sales price from using the residential average, make huge differences to the bottom line. I guess that is not surprising when the volume of the kwh is so large even for just one month.