Sandia Energy > Programs > Renewable Energy > Photovoltaic Solar Energy > Staff > Clifford Hansen Ph.D. Clifford Hansen Distinguished Member of Technical Staff Contact Information Clifford Hansen / 505-284-1643 Biography Dr. Clifford Hansen is a Distinguished Member of the Technical Staff in the Renewable and Distributed Systems Integration Program. He leads efforts to develop reusable open source software capabilities for renewable energy systems. Current projects include pvlib-python (https://github.com/pvlib/pvlib-python.git) for solar power modeling, pvanalytics (https://github.com/pvlib/pvanalytics.git) for analysis of data from solar power systems, and the Orange Button initiative (https://orangebutton.io) to simplify exchanging solar system data. Cliff received his PhD in mathematics from The George Washington University Education Ph.D., Mathematics, The George Washington University Google Scholar: Clifford Hansen Key Publications 2020 Clifford Hansen, Thomas Anthony Catanach, Austin Michael Glover, Jose Gabriel Huerta, Zach Stuart, Ross Guttromson, “Modeling Failure of Electrical Transformers due to Effects of a HEMP Event,”Sandia National Lab.(SNL-NM), Albuquerque, NM (United States); Sandia National Lab.(SNL-CA), Livermore, CA (United States), 2020. William F Holmgren, Clifford W Hansen, Aidan Tuohy, Justin Sharp, Antonio T Lorenzo, Leland J Boeman, Adam Wigington, David Larson, Qin Wang, Anastasios Golnas, “The Solar Forecast Arbiter: An Open Source Evaluation Framework for Solar Forecasting,” 100th American Meteorological Society Annual Meeting, 2020.