NERC-CIP compliance is expanding beyond the perimeter. For decades, electric utilities, generation and transmission operators, and other Bulk Electric System (BES) entities have built their compliance programs around securing and monitoring the boundary of their networks. With the approval of CIP-015, that's no longer enough: regulators now expect visibility inside the network too. This post covers what NERC-CIP requires, who it applies to, and why network-level visibility, not just perimeter defense, is becoming the standard compliance teams are held to.
What Is NERC-CIP?
NERC-CIP, or Critical Infrastructure Protection, refers to mandatory reliability standards developed by the North American Electric Reliability Corporation (NERC) and approved by the Federal Energy Regulatory Commission (FERC) to protect the Bulk Electric System from cybersecurity and physical security risks. Unlike voluntary security frameworks, NERC-CIP requirements are legally enforceable, with financial penalties for non-compliant entities.
The standards span a wide range of controls, from personnel training and physical security to information protection and system security management. Each is written as a numbered requirement (CIP-005, CIP-007, and so on), and entities are audited against them on a recurring basis.
NERC-CIP Requirements: Who They Apply To
NERC-CIP applies to Responsible Entities that own or operate BES Cyber Systems, including:
Critical Infrastructure providers
Electric utilities
Generation operators
Transmission operators
Balancing authorities and other registered entities across the bulk power system
Which specific requirements apply depends on BES Cyber System categorization. Systems are classified as high, medium, or low impact based on their potential effect on grid reliability if compromised. High and medium impact systems, particularly those with external routable connectivity, carry the most extensive monitoring and reporting obligations.
The NERC-CIP Standards That Matter Most for Network Visibility
NERC-CIP covers everything from background checks to vulnerability assessments, but a smaller subset governs network-level visibility and monitoring directly:
| Standard | What It Requires | How SentryWire Supports It |
|---|---|---|
| CIP-005 (Electronic Security Perimeters) | Securing and monitoring the boundary between BES Cyber Systems and outside networks | Full packet capture at monitored network points to support Electronic Security Perimeter traffic analysis and boundary validation |
| CIP-007 (System Security Management) | Security event monitoring and logging within BES Cyber Systems | Packet-level evidence that confirms and enriches log-based security events. See our breakdown of CIP-007 R4 specifically |
| CIP-008 (Incident Reporting and Response Planning) | Cyber Security Incident response planning, testing, documentation, and reporting | High-fidelity packet data that supports incident reconstruction, investigation, and reporting |
| CIP-015 (Internal Network Security Monitoring) | Internal network security monitoring for applicable networks within the ESP | Passive, line-rate packet data as a network data source for internal monitoring and anomaly detection |
CIP-015 and the Internal Network Security Monitoring Requirement
CIP-015-1 is the newest addition to this list, and the most significant shift in scope. Approved by FERC in 2025 (Docket RM24-7-000), it extends NERC-CIP's focus beyond perimeter controls to activity happening inside protected networks, closing a longstanding gap where firewalls and boundary controls saw traffic crossing the perimeter but not communications between systems already inside it. That's a continuous, passive monitoring problem, not a scanning problem, and it applies to all high impact BES Cyber Systems and medium impact systems with external routable connectivity, on a phased implementation timeline.
CIP-015 is enough of a shift on its own to warrant its own breakdown. See our full guide to CIP-015 and internal network security monitoring requirements for implementation timelines, what counts as a qualifying network data feed, and how to prepare.
How SentryWire Supports NERC-CIP Compliance
SentryWire's full packet capture platform provides continuous, passive packet-level visibility that can support a CIP-015 internal network security monitoring program without introducing active scanning traffic to sensitive OT systems. Because capture happens passively at line rate rather than through active probing, it adds high-fidelity network visibility without touching sensitive control systems.
Long-term packet retention also supports CIP-008 incident investigation and reporting, preserving high-fidelity network evidence alongside logs and alerts so security teams can reconstruct what actually happened on the network around an incident. SentryWire is built for the segmented, high-throughput environments common across ICS/OT networks in energy infrastructure, and for federal entities layering NERC-CIP alongside other mandates, the same underlying packet data supports CDM and broader compliance requirements as well.
Frequently Asked Questions
What is NERC-CIP?
NERC-CIP (Critical Infrastructure Protection) is a set of mandatory, enforceable reliability standards created by NERC and FERC to protect the Bulk Electric System from cyber and physical security threats. Non-compliance can result in financial penalties.
Who does NERC-CIP apply to?
NERC-CIP applies to Responsible Entities that own or operate BES Cyber Systems, including electric utilities, generation operators, transmission operators, and balancing authorities. Specific requirements depend on whether a system is classified as high, medium, or low impact.
What is CIP-015?
CIP-015 establishes internal network security monitoring (INSM) requirements for high impact BES Cyber Systems and medium impact systems with External Routable Connectivity, requiring documented network data feeds and methods for detecting and evaluating anomalous internal network activity.
Building NERC-CIP Compliance on Network Evidence
NERC-CIP compliance increasingly requires visibility inside the network, not just at the perimeter. CIP-015 made that explicit, but the underlying need (defensible evidence of what actually happened on the network) applies across CIP-005, CIP-007, and CIP-008 too.
To see how SentryWire supports CIP-015 compliance specifically, including implementation timelines and readiness steps, or request a demo to talk through your timeline.
