This grant supports a cohort of three postdoctoral fellows in data curation for energy social science, overseen by the Council on Library and Information Resources (CLIR). One fellow will be placed at each of the following three institutions, involving both their respective energy research centers and university libraries: Scott Institute for Energy Innovation at Carnegie Mellon University, the University of Michigan Energy Institute, and the Center for Energy and Environmental Policy Research at the Massachusetts Institute of Technology. In addition to recruiting, selecting, and placing the postdoctoral fellows, CLIR organizes training programs and mentorship activities throughout the two-year fellowship program. This includes an initial introductory summer institute, regular mentoring calls with fellows and their institutional hosts, funding for travel to present at and attend conferences, and a pool of resources to help initiate collaborative projects developed by the fellows. This second phase of CLIR postdoctoral fellowships builds on a successful first round of fellowship support that is nearing conclusion. The program offers a unique opportunity to train the next generation of scholars and practitioners, while simultaneously providing core energy research institutions with expertise in cutting-edge data science analysis.