1. National Renewable Energy Lab. (NREL), Golden, CO (United States)
2. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
3. Univ. of Washington, Seattle, WA (United States)
4. Sandia National Laboratories (SNL), Albuquerque, NM, and Livermore, CA (United States)
5. Univ. of Wisconsin, Madison, WI (United States)