ASCR Leadership Computing Challenge (ALCC)

The call for the ALCC 2019-2020 allocation year is now closed.

  • Application instructions.
  • Submission site.

ALCC Mission

The mission of the ASCR Leadership Computing Challenge (ALCC) is to provide an allocation program for projects of interest to the Department of Energy (DOE) with an emphasis on high-risk, high-payoff simulations in areas directly related to the DOE mission and for broadening the community of researchers capable of using leadership computing resources.

Current Awards

ALCC grants one year awards. For a listing of 2019 awarded projects see Current Awards.

Overview of ALCC

Open to scientists from the research community in industry, academia, and national laboratories, the ALCC program allocates up to 30% of the computational resources at ASCR’s supercomputing facilities. ASCR supercomputing facilities include NERSC at Lawrence Berkeley National Laboratory and the Leadership Computing Facilities at Argonne and Oak Ridge National Laboratories. These resources represent some of the world’s fastest and most powerful supercomputers.

ALCC is one of several allocation programs for ASCR supercomputing facilities (see ASCR Allocation Policy) and supports our efforts to further DOE mission science and to broaden community access to leadership computing facilities. To fulfill its goal of broadening community access, ALCC supports a wide range of project allocation sizes and allocates time across all three ASCR supercomputing facilities.

Scientific discovery advanced by ALCC allocations range across the DOE mission space such as energy efficient engineering, computer science, materials discovery, bioenergy, computational fluid dynamics, nuclear physics, cosmology, and nuclear energy. (See ALCC Past Awards and Awardees).

ALCC Resources

ALCC allocates high performance computing time on the primary HPC machines at each ASCR facility. For 2019-20 ALCC, these resources include Summit at Oak Ridge National Laboratory, Theta at Argonne National Laboratory, Cori/KNL (Cray XC40 Intel Xeon Phi KNL nodes) at Lawrence Berkeley National Laboratory. For a description of the computing resources at ASCR facilities, please see

See side bar for more ALCC information links.