The DOE has recently announced its call for proposals for those seeking time on select supercomputers through the INCITE program. From the DOE HPC page
For the seventh consecutive year, the Innovative and Novel Computational Impact on Theory and Experiment (INCITE) program invites proposals for large-scale, computationally intensive research projects to run at America’s premier leadership computing facility (LCF) centers, established and operated by the U.S. Department of Energy (DOE) Office of Science. The INCITE program awards sizeable allocations (typically, millions of processor-hours per project) on some of the world’s most powerful supercomputers to address grand challenges in science and engineering, such as developing new energy solutions and gaining a better understanding of climate change resulting from energy use.
This year the program will award 1.3 billion process hours, and is open to government, commercial, and academic participants. More info in the release, and proposals are due July 1.