Power & Utilities

Barrier Management Across Aging Grid Assets

A regional power generation and transmission operator managing a mixed fleet of thermal and renewable assets.

We checked the operator's safety-critical equipment against its design intent and fixed three degraded barriers ahead of a regulatory audit.

Degraded safety-critical barriers found and remediated before the regulatory audit

Situation

Barrier management tracks the specific equipment and controls that stop a hazard becoming an incident, and checks each against its original design intent. It underlies the protection-system maintenance programs required by NERC's PRC series of Reliability Standards, notably PRC-005, and the wider asset-management approach set out in ISO 55001.

A maintenance record proves an inspection took place. It does not prove the barrier still does its job. This operator's program rested on the first kind of evidence. An internal review raised the gap to board level before an upcoming regulatory audit cycle, which meant the operator found it before a regulator did.

What we did

We set up a program that follows each safety-critical barrier across the generation and grid fleet. Field verification ran at the same time as the documentation review, so the operator ended up with one picture of asset condition instead of two that might disagree.

Question	Maintenance record answers	Barrier verification answers
Was the equipment serviced?	Yes, with a date	Yes, and what the service restored
Does it still perform its protective function?	Not addressed	Tested against design intent
What should the board see?	Completion rates	Barrier condition across the fleet

Impact

Verification found three barriers that had degraded. All three were repaired before the scheduled audit, and before any of them led to a reportable misoperation or a forced outage.
Barrier condition is now verified on a continuing cycle, which the operator did not have before.
The board went into the audit with evidence of control, where previously it had a documentation gap.

What made it work

Verified against design intent

Each check asked whether the barrier still performs the function its design assumed. Being serviced on time was not enough to pass.

Coverage was complete. Every generation and grid asset was in scope, so no part of the fleet relied on the older, paper-only assurance.

Results

Three degraded barriers remediated ahead of the scheduled audit

The operator's first continuous asset-integrity verification cycle

An evidenced compliance position for the board before the audit

Engagement facts

Sector: Power & Utilities
Practice area: HSE Advisory
Client profile: Regional generation and transmission operator, thermal and renewable fleet
Services: Barrier management program, field verification, audit preparation
Key phases: Field verification and document review in parallel, completed before the audit cycle

This case study is a composite drawn from multiple engagements. Client details have been changed and combined to protect confidentiality, and figures are representative rather than attributable to any single client.