Most utility rates are either tiered (residential) or time of use (commercial). As a result, different charges will occur depending upon when your building is using energy, as well as how much it uses. Energy usage in the higher tiers tends to be more expensive, as is the energy usage during peak periods. Unless the baseline building and your building have exactly the same load profiles, the virtual rate is going to vary. In addition, many rates carry a base monthly meter charge that can be substantial and is included in the overall rate.
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