1. National Renewable Energy Lab. (NREL), Golden, CO (United States)
2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
3. Argonne National Lab. (ANL), Argonne, IL (United States)
4. Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
5. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
6. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)