Securing Energy Infrastructure Act This bill establishes a two-year pilot program within the Department of Energy's (DOE) national laboratories to identify the security vulnerabilities of certain entities in the energy sector, and research and test technology that can be used to isolate the most critical systems of such entities from cyber-attacks. In addition, DOE must establish a working group to evaluate the technology solutions proposed by the national laboratories and to develop a national cyber strategy to isolate the energy grid from attacks. DOE must also submit a report to Congress describing the results of the pilot program, assessing the feasibility of the techniques considered, and outlining the results of the working group's evaluation.