This tool provides a quick method for approximating the payback period for a typical Greengate installation. Users enter pertinent data such as the quantity and types of equipment installed, local electricity rate and hours that loads will be off or dimmed due to system operation. The tool then calculates approximate installed costs including labor, energy saved in KWH and dollars and the payback period in years for the system. The ROI calculator allows agents, ESCOs, contractors, and end users an easy means of estimating the costs and benefits of an energy management system installation.