Two offices of the U.S. Department of Energy accounted for nearly 90% of the total federal solarR&D spending in fiscal 2015: the Solar Energy Technologies Office, which spent $233 million, and the Office of Science, which spent $118.9 million.174 Far smaller amounts were spent, in declining order of size, by the Department of Energy’s Advanced Research Projects Agency - Energy (ARPA-E), the National Science Foundation (NSF), the National Institute of Standards and Technology (NIST), the Department of Defense (DoD), the Department of Agriculture’s (USDA’s) National Institute of Food and Agriculture (NIFA), other parts of the USDA, and the National Aeronautics and Space Administration (NASA).
