How are the Process Subtotal (\$) and Total Energy Cost (\$) calculated in the Utility Bills/Rates section of Open Studio Results.

edit

I am investigating the affects of precooling and thermal energy storage on a couple of different building models. I have implemented a time of use utility tariff structure using a measure. I would expect to see cost savings for both precooling and TES but when I run the simulations against my baseline case I get a greater Total Energy Cost vs my baseline case. However, I get a lower Process Subtotal for both precooling and TES when compared to the baseline case. Any insight into how both of these outputs are calculated are greatly appreciated.