Dr. Dan E. Arvizu announced that he intends to retire at the end of September from his role as the director and chief executive of the Energy Department’s (DOE) National Renewable Energy Laboratory (NREL) in Golden, CO.   Arvizu also expects to retire as president of Alliance for Sustainable Energy, LLC, at the end of September. Alliance manages NREL on behalf of the Energy Department. Arvizu has held the role of laboratory director at NREL since January 2005.   “NREL’s work is critical to D...