The Architect has prepared payback analyses for Photo Voltaic (PV), Bio-Mass fuel heating, and Geo-Thermal heating and cooling. A PV system sized for production of about 660kw might have a payback of about 13 years. There was no payback term identified for Bio-Mass heating as the costs were more than the base selected systems. Geothermal heating and cooling might provide payback in 14 years over using natural gas boiler heating and chilled water cooling. Further evaluation will be done during detail design.