Xcel energy CEO Dick Kelly (l) and NREL Director Dr. Xcel Energy CEO Dick Kelly and NREL Director Dr. Dan Arvizu push the green button for the project dedication at National Renewable Energy Laboratory in Boulder, Colorado on Thursday December 14, 2006. N
LINDA McCONNELL, Xcel energy CEO Dick Kelly (l) and NREL Director Dr. Xcel Energy CEO Dick Kelly and NREL Director Dr. Dan Arvizu push the green button for the project dedication at National Renewable Energy Laboratory in Boulder, Colorado on Thursday December 14, 2006. N (12/14/2006), [434327928] . Denver Public Library Digital Collections, accessed 12/01/2026, https://digital.denverlibrary.org/nodes/view/948052