eXtremeMAT brings together seven leading U.S. DOE National Laboratories to harness the unparalleled breadth of unique capabilities for materials design, high-performance computing, manufacturing, and characterization that exist across the U.S. DOE complex to accelerate the development of materials for service in extreme environments. The collaboration supports the U.S. DOE Office of Fossil Energy’s High Performance Materials Program by addressing material integrity challenges inherent in highly efficient advanced energy systems. Specifically, this mission-focused team aims to improve both heat-resistant alloys and models for predicting long-term material performance. The consortium consists of the National Energy Technology and partner laboratories Ames Laboratory, Idaho National Laboratory, Lawrence Livermore National Laboratory, Los Alamos National Laboratory, Oak Ridge National Laboratory, and Pacific Northwest National Laboratory.