"The Division of Dam Safety and Inspections (D2SI) monitors the security programs and measures implemented by dam owners. This document provides guidance to both the FERC [Federal Energy Regulatory Commission] licensees/exemptees and staff in the execution of this program. [...] D2SI conducts periodic security inspections of projects based on the current threat conditions and as determined by the Attorney General and the Office of Homeland Security in order to insure the security of FERC hydropower projects. These inspections determine if the licensees have implemented a security plan appropriate to site conditions and to current threat conditions while remaining flexible enough to address elevated threat conditions."
Federal Energy Regulatory Commission: http://www.ferc.gov/