Purchased chilled water utility rates include energy costs, equipment maintenance costs, water costs (for cooling tower make-up), etc. If a proposed design uses purchased chilled water from a utility (as opposed to on site chillers or some other form of cooling capacity on site), are we required to use the published utility rate that includes all of these costs in our energy model? Or are we allowed to work with the utility to determine which portion of their rate is solely for the energy costs?
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