Nuclear power plants have specific emergency plans in order to ensure that emergency systems are operational and to guarantee the safety of employees and the public, which include both an External Emergency Plan (Plan de emergencia exterior), for which the governmental authorities are responsible (called the Nuclear Emergency Plan (Plan de Emergencia Nuclear) (PEN) of the Province in which each plant is located), and an Internal Emergency Plan (Plan de emergencia interior) (PEI), compliance with which is the responsibility of the companies that own the power plant.