Massachusetts Institute of Technology scientist Ernest Moniz is introduced by President Obama as the nominee to run the Energy Department, Monday at the White House. Mandel Ngan/AFP/Getty Images hide caption

itoggle caption Mandel Ngan/AFP/Getty Images

Energy Secretary Steven Chu tours the Vogtle nuclear power plant in Waynesboro, Ga., last year. David Goldman/AP hide caption

itoggle caption David Goldman/AP