Project is utilizing energy from a central plant, the team is attempting to decide between using the purchased energy approach vs. modeling the plant.  The project is LEED v4 and follows ASHRAE 90.1-2010; if the central plant does not comply with 90.1-2010 is the "model the plant efficiencies" no longer an option?   If the central plant does not meet 90.1-2010 does that disqualify the entire project?