In the Project Type Variations section, under Path 1. ASHRAE 90.1-2010, Appendix G, at the bottom of the section with the title "Energy Rates" in italics, insert the following guidance for projects where no tariffs or rates are available from the district energy system servicing the project:

"Energy Rates for Path 1:
• If tariffs or rates are not available from the district plant servicing the project (e.g. for campus or military plants), calculate the rates based on the virtual electric and fossil fuel rates from the model:
o If a flat rate structure is being used for all energy sources (meaning the cost per unit energy is the same throughout the year, and there are no demand charges), then these flat rates simply become the virtual energy rates for the project.
o Otherwise, if all energy rate structures are not flat, then a preliminary run of the Option 1 Baseline Case energy model must first be completed to identify the virtual electric and fossil fuel rates for the project. For this preliminary run only, the rate for the DES-supplied energy may be left blank, or may be entered as any value.
o Once all the virtual energy rates are known for electricity and fossil fuel, the virtual DES rates for both the Baseline and Proposed Case are then derived as follows:
District Chilled Water Rate:
Units of $/(Btu x 106) = Virtual Electric Rate (in $/kWh) x 71
Units of $/ton-hour = Virtual Electric Rate (in $/kWh) x 0.85
Units of $/kWh = Virtual Electric Rate (in $/kWh) x 0.24
District Hot Water Rate:
Units of $/(Btu x 106) = Virtual Fuel Rate (in $/(Btu x 106)) x 1.59 + Virtual Electric Rate (in $/kWh) x 3
Units of $/kWh = Virtual Fuel Rate (in $/kWh) x 1.59 + Virtual Electric Rate (in $/kWh) x 0.01
Units of $/therm = Virtual Fuel Rate (in $/therm) x 1.59 + Virtual Electric Rate (in $/kWh x 0.3)

District Steam Rate:
Units of $/ (Btu x 106) = Virtual Fuel Rate (in $/(Btu x 106)) x 1.81 + Virtual Electric Rate (in $/kWh) x 3
Units of $/kWh = Virtual Fuel Rate (in $/kWh) x 1.81 + Virtual Electric Rate (in $/kWh) x 0.01
Units of $/therm = Virtual Fuel Rate (in $/therm) x 1.81 + Virtual Electric Rate (in $/kWh x 0.3)

o Exception: to obtain the virtual fuel rate when the connected building does not use fossil fuel but the DES central plant does, use a flat rate consistent with the central plant rates or the historic average local market rates (no preliminary model run is needed). The virtual fuel rates must match in the Baseline and Proposed Case.
o The virtual DES rates are then input into the modeling software for each DES source and used for the remainder of the process. Alternatively, the virtual DES rates may be used to calculate the DES energy costs directly by multiplying the DES energy consumption for each DES source by its virtual DES rate. All virtual DES energy rates must be identical in the Baseline and Proposed Case."