Capturing heat recapture for absorption dhillers

We are working on a college campus that will have a new central plant. We have a onsite micro turbine generators that provide power to the site. The heat from those turbines is used as a heat source for the dual fired double effect absorption chillers. How do I model the onsite electricity generation? And the energy recovery used for the chillers? Also, I our engineer thinks this condition might be considered worthly of a campus wide ID credit. I believe the energy efficiency of the system will ultimate be reflected in the energy calcs and NOT be availalbe for an ID credit. Thanks for your help.