Abstract: An energy decision management system manages, controls, or manipulates data to monitor, measure, or control one or more energy systems. The EDMS includes at least three modules or systems working together to manage the information needed for a user to render decisions as to which energy system to operate, in which the desire is to minimize costs. The EDMS includes a budget/forecast module, a scheduling module, and a performance module. The budget module creates a strategic energy decision plan to run various energy systems. The scheduling module creates an operational schedule to determine which energy system is best to operate based on predetermined criteria. The performance module produces management reports to quantify operational issues and successes.