||Monroe Power Plant (MPP) of DTE Energy, a 3200 MW generating station fired with blends of Powder River Basin subbituminous coal and Central Appalachian bituminous coal, has developed and advanced the technologies of on-line coal analysis. Technologies involved include both the analytical instrumentation and the communication of results to operators trained in the use of these results. At MPP the x-ray fluorescence (XRF) analyzer provides the full proximate analysis and calorific value of the fuel being transported to the silos; it also provides the complete ash elemental analysis of this fuel. Through additional statistical manipulation the XRF provides ultimate analysis data to the operator. The XRF obtains a data set every 90 seconds. The software used to transmit the data to the power plant operators, developed by Engineering Consultants Group (ECG) of Akron, OH, provides operators, shift supervisors, and engineering staff with data concerning the fuel being burned at the present time, fuel that can be expected in 1 hr, 2 hrs, 4 hrs, and the fuel being loaded into the silos. The information provided to operations includes an assessment of the quality of the fuel from several perspectives: calorific value, moisture content, ash loading, and ash chemistry. Further, using the analyzer and associated PI data, the operator can obtain real time boiler efficiency and flyash resistivity data. Training of personnel provides staff with insights into the meaning of the data, and appropriate responses to the data. For example, the operations group, led by the shift supervisor, periodically adjusts the blend to optimize calorific value, minimize slagging and fouling potential, manage the use of SO3 for flyash conditioning, and manage the use of REF additive for emissions control. These capabilities have been employed by the plant for the past several years, facilitating operation of the four units at MPP. This paper describes the system, its usage, and its technical benefits to the generating station.