Nov. 21, 2025 — ALCC is soliciting proposals for allocation awards for the 2026-2027 allocation year.
For more information:
High performance computing machines available for the allocation cycle include Aurora, the exascale system at the Argonne Leadership Computing Facility (ALCF); Polaris, the 44-petaflop accelerated system at ALCF; Frontier, the exascale system at the Oak Ridge Leadership Computing Facility (OLCF); and Perlmutter, an accelerated system at National Energy Research Scientific Computing Center. 10% to 30% of the allocatable computing time will be made available on each of these machines to the ALCC program.
Important points for applicants:
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Single-step Submission: The ALCC proposal submission process will feature a single proposal submission (i.e. no pre-proposal submission).
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Multi-year Awards: ALCC will now accommodate multi-year proposal requests. Applicants can request computation time for up to three years. If granted an allocation, a renewal proposal will need to be submitted to access subsequent year(s) allocations.
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Mid-year Allocation Reductions: On November 1, 2026 and March 1, 2027, a percentage of unused allocation hours will be returned to the ALCC program for redistribution to other projects. For more information, please see Allocation Reduction Information.
About ALCC: The ASCR Leadership Computing Challenge (ALCC) is a high performance computing allocation program for projects of interest to the Department of Energy (DOE), with an emphasis on high-risk, high-payoff scientific campaigns in areas directly related to the DOE mission, that respond to national emergencies, or that broaden the community of researchers capable of using leadership computing resources. ALCC projects span a wide range of large-scale computing approaches, including modeling and simulation, artificial intelligence (AI), and data analysis.
