Controlled Unclassified Information (CUI)

Registry: Critical Infrastructure-Critical Energy Infrastructure Information

Critical Infrastructure-Critical Energy Infrastructure Information

Category-Subcategory Practices

Category-Subcategory: Critical Infrastructure-Critical Energy Infrastructure Information

Category Description:

Systems and assets, whether physical or virtual, so vital that the incapacity or destruction of such may have a debilitating impact on the security, economy, public health or safety, environment, or any combination of these matters, across any Federal, State, regional, territorial, or local jurisdiction.

Subcategory Description: Critical energy infrastructure information means specific engineering, vulnerability, or detailed design information about proposed or existing critical infrastructure that:
(i) Relates details about the production, generation, transportation, transmission, or distribution of energy;
(ii) Could be useful to a person in planning an attack on critical infrastructure;... and
(iii) Does not simply give the general location of the critical infrastructure.


Abbreviated Marking: CEII

Designated Only by: Federal Energy Regulatory Commission

Category-Subcategory Type: Basic - Standard Practics apply for Safeguarding, Marking, Dissemination and Decontrol
Marking and Handling Instructions:
  • Reference the CUI Marking Handbook for instructions on format and placement of marking.
  • Reference CUI Supplemental Guidance for instructions on Safeguarding, Marking and Dissemination practices.
  • Reference individual Safeguarding and Dissemination authorities for instructions on Specified handling practices, if applicable.
  • Users are reminded to reference agency policy regarding agency-specific guidelines for CUI.



Select Safeguarding/Dissemination or Sanction Authority to view statutory/regulatory language in a new window.
Authority links are updated based on regular re-publication of the United States Code and Code of Federal Regulations.

Safeguarding and/or Dissemination Authority Sanctions
18 CFR 388.113