A University of Utah team has used 40 million supercomputing processor hours at two DOE Office of Science leadership computing facilities to simulate the design and operation of a large oxy-coal boiler. The computer time – 10 million processor hours on Mira, an IBM Blue Gene/Q at Argonne National Laboratory and 30 million hours on Titan, a Cray XK7 at Oak Ridge National Laboratory – was awarded through the DOE Office of Science’s ASCR Leadership Computing Challenge.