NIST SP 800-53 Rev. 5 PE-11(2) — Alternate Power Supply -- Self-Contained : iCompaas Support

NIST SP 800-53 Rev. 5·Control PE-11(2)·critical·Component: Physical and Environmental Protection

What this control requires

Providing a self-contained alternate power supply that is not reliant on external power generation. This supply must be capable of maintaining either minimally required or full operational capability in the event of an extended loss of the primary power source and can be activated either manually or automatically. This control supports the Self-Contained Power Supply capability within the Physical and Environmental Protection family.
— NIST SP 800-53 Rev. 5, Control PE-11(2)

In plain English

Providing a self-contained alternate power supply that is not reliant on external power generation. In practice, this means you can prove you policy management-level controls on a defined cadence.

Why it matters

SP 800-53 is the catalogue every U.S. federal authorisation (FedRAMP, FISMA, CMMC) and most regulated industries point at. A missing control surfaces as a Plan of Action & Milestones (POA&M) item that an Authorizing Official must approve before the Authority To Operate is granted or renewed.

This control is rated critical in the source catalogue. Treat gaps here as production incidents in the risk register, not housekeeping.

What an auditor looks for

A 3PAO (FedRAMP) or Independent Assessor (NIST RMF) tests against NIST SP 800-53A assessment procedures. For each control they expect a documented implementation that addresses every assessment objective (Examine, Interview, Test) and an implementation summary in the System Security Plan.

Within Physical and Environmental Protection, the assessor will trace your implementation back to the catalogue reference (Control PE-11(2)) and look for objective evidence on the latest two assessment cycles.

How to implement

Logging Monitoring

AWS. Org-trail CloudTrail to a central log archive account, GuardDuty in every region, and Security Hub for cross-source correlation.

Azure. Pipe every diagnostic setting into a central Log Analytics workspace; onboard Microsoft Sentinel for SIEM/SOAR.

GCP. Aggregate audit logs in a dedicated logging project with sink to BigQuery; enable Security Command Center Premium and route findings to Chronicle SIEM.

Policy Management

Docs. Keep each policy in version-controlled Markdown alongside the code that implements it; ship a signed PDF snapshot at each annual review and link the SHA into the SoA.

Operational checklist

Policy. Document the trigger, the owner and the cadence.
Physical. Document the trigger, the owner and the cadence.
Protection. Document the trigger, the owner and the cadence.
Full. Document the trigger, the owner and the cadence.
Environmental. Document the trigger, the owner and the cadence.
Scope: management, controls, source, protection, generation, capability, power, policy.

Evidence to collect

Policy Document. A signed and version-controlled policy / standard / procedure document.

Signed policy or standard documents the safeguard. Focus: Alternate Power Supply -- Self-Contained.

Common pitfalls

Per-account logging that nobody stitches together at the org level — incidents that cross accounts go undetected for days.
Policies that no engineer has read; the version in Confluence drifts from the version that's actually being enforced.

How it maps to other frameworks

Computed from shared tags, control component and key-operation subjects — handy when you are reconciling controls across an audit.

Related controls in NIST SP 800-53 Rev. 5

References

NIST Computer Security Resource Center — NIST SP 800-53 Rev. 5
Catalogue identifier: Control PE-11(2)

Topics: governance riskenvironmental controlslogging monitoringpolicy management

NIST SP 800-53 Rev. 5 PE-11(2) — Alternate Power Supply -- Self-Contained