What matters in the environmental performance of campus buildings? Net energy use and life cycle impacts of a district heating, cooling, and power system. The integration of heating, cooling, and electricity systems has emerged as an extension of the broad combined heat and power (CHP) technology family, whereby the production of electricity, and energy carriers for heating and cooling are co-produced in one, or a small number of generation plants, for a local energy grid. Such an integrated district heating, cooling, and power (DHCP) system has potential to avoid some losses associated with traditional energy production systems where the different forms of energy are produced independently, such as waste heat from a power plant, and transmission and distribution losses. But do DHCP systems more efficiently meet energy demands compared with the more traditional combination of centralized production and distribution of electricity with demand side energy conversion for thermal comfort (i.e. space heating provided by on-site gas/oil combustion, on-site electric-powered A/C, etc.)? System Energy Analysis and Life Cycle Analysis are used to investigate these questions, using the Yale central campus as a case study. Preliminary results are presented which analyze the energy requirements of the parts of the Yale campus served by the central power plant and the central campus chiller plant. The energy provided is in three forms, steam for heating, chilled water for cooling, and electric power. The energy inputs to the system are natural gas and some electricity from a utility provider. Behavior and system optimization based opportunities for energy demand and life cycle environmental impact reduction are identified, and the DHCP system is compared with an alternative where all energy demands are provided for by utility electricity and on-site conversion of utility natural gas and electricity for heating and cooling, respectively.