The Challenge Jeffrey Energy Center Unit 3 is a sub-critical, 780 MW Powder River Basin (PRB) coal fired boiler. The unit was placed in service in 1983 and is one of the first units in the country designed to burn PRB coal. Originally, the unit was rated for 680 MW gross, and could rarely maintain more than several consecutive days without derates. The Furnace Exit Gas Temperature (FEGT) was in excess of the ash fusion temperatures for the PRB coal which caused deposit accumulation on the convection tube assemblies. History of fouling at the plant included frequent tube leaks, plugged pendants, and molten ash carryover in the Economizer. Prior to the installation of the SMART CleanTM, Jeffrey Energy Center implemented additional sootblowing retracts in the backpass, additional

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