# PE-11(2)_alternate-power-supply-self-contained

> Provide an alternate power supply for the system that is activated [organization-defined] and that is: Self-contained; Not reliant on external power g

- Skill: `cyberstrikeus/pe-11-2-alternate-power-supply-self-contained` (Agent Skill)
- Install (CLI): `npx skillmds@latest add cyberstrikeus/pe-11-2-alternate-power-supply-self-contained`
- Raw SKILL.md: https://api.skillmd.com/api/skills/cyberstrikeus/pe-11-2-alternate-power-supply-self-contained/raw
- Safety review: PASS (external: skill-scanner PASS, skillspector PASS)
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- Author: cyberstrikeus (https://skillmd.com/u/cyberstrikeus)
- Updated: 2026-09-17
- Page: https://skillmd.com/skills/cyberstrikeus/pe-11-2-alternate-power-supply-self-contained

---


# PE-11(2) Alternate Power Supply — Self-contained

> **Enhancement of:** PE-11

## High-Level Description

**Family:** Physical and Environmental Protection (PE)
**Framework:** NIST SP 800-53 Rev 5

The provision of a long-term, self-contained power supply can be satisfied by using one or more generators with sufficient capacity to meet the needs of the organization.

## What to Check

- [ ] Verify PE-11(2) Alternate Power Supply — Self-contained is documented in SSP
- [ ] Validate all 3 control requirements are implemented
- [ ] Confirm control is operating effectively
- [ ] Review evidence of continuous monitoring for PE-11(2)
- [ ] Verify enhancement builds upon base control PE-11

## How to Test

### Step 1: Review Documentation

Examine the System Security Plan (SSP) and related artifacts for PE-11(2) implementation details. Verify the organization has documented how this control is satisfied.

### Step 2: Validate Implementation

```
# For cloud environments, use cloud-audit-mcp tools
# For on-premises, review system configurations directly

# Example: Check if account management policies exist
grep -r "account.management\|access.control" /etc/security/ 2>/dev/null
```

### Step 3: Test Operating Effectiveness

Verify the control is actively functioning, not just documented. Check logs, configurations, and operational evidence.

## Tools

| Tool          | Purpose                           | Usage |
| ------------- | --------------------------------- | ----- |
| Manual Review | Documentation and interview-based | N/A   |

## Remediation Guide

### Control Statement

Provide an alternate power supply for the system that is activated [organization-defined] and that is:
Self-contained;
Not reliant on external power generation; and
Capable of maintaining [organization-defined] in the event of an extended loss of the primary power source.

### Implementation Guidance

The provision of a long-term, self-contained power supply can be satisfied by using one or more generators with sufficient capacity to meet the needs of the organization.

## Risk Assessment

| Finding                                                          | Severity | Impact                                           |
| ---------------------------------------------------------------- | -------- | ------------------------------------------------ |
| PE-11(2) Alternate Power Supply — Self-contained not implemented | Medium   | Physical and Environmental Protection            |
| PE-11(2) partially implemented                                   | Low      | Incomplete Physical and Environmental Protection |

## CWE Categories

| CWE ID | Title                 |
| ------ | --------------------- |
| N/A    | No direct CWE mapping |

## References

- [NIST SP 800-53 Rev 5 - PE-11(2)](https://csrc.nist.gov/projects/cprt/catalog#/cprt/framework/version/SP_800_53_5_1_1/home?element=pe-11.2)
- [NIST SP 800-53A Rev 5 (Assessment Procedures)](https://csrc.nist.gov/pubs/sp/800/53/a/r5/final)
- [NIST SP 800-53 Rev 5 Full Catalog](https://csrc.nist.gov/pubs/sp/800/53/r5/upd1/final)

## Checklist

- [ ] Control documented in SSP
- [ ] Implementation evidence collected
- [ ] Operating effectiveness validated
- [ ] Continuous monitoring in place
- [ ] Related controls (none) reviewed