This presentation will illustrate the relationship and impact of different energy generation and storage technologies on building energy use (electricity, heating, and cooling). These technologies include combined heat and power (gas turbine, duct burner, heat recovery steam generator), a steam turbine, boilers, chillers, cooling towers, solar panels, and energy storage (battery and thermal). The analysis was done with modeling tools, including the Solar Turbines Engine Performance Program Modeling Tool, DOE's Steam System Modeler Tool, OpenModelica, MATLAB's Simulink, and OpenStudio with EnergyPlus. The results showcase the impact of using different energy technologies on overall building energy use, efficiency, energy footprint, and cost. The results also examine the relationship between combining technologies to supply and store heating, cooling, and electricity as shown through changes in efficiency, equipment utilization, and backup power availability. The presentation also discusses the lack of physics-based energy generation tools in the building energy space and the need for cohesion and open-source tools.