This updated second edition focuses on all components of the energy sector, including sites involved in producing, refining, transporting, generating, transmitting, conserving, building, distributing, maintaining, and controlling energy systems and system components. This text presents common-sense methodologies in a straightforward manner and is accessible to those who have no experience with energy infrastructure or homeland security. It is intended to help employers and employees handle security threats they must be prepared to meet on a daily basis.