Determining Corrective Action After the Incident: Why Root Cause Analysis is the Next Frontier for Independent Engineering

The Question Nobody Owns After a Failure

When a steam turbine trips unexpectedly, a transformer fails well ahead of its design life, or an inverter-based resource behaves differently than its model predicted, the immediate questions are technical. The questions that follow are not. What exactly happened? What is the underlying cause, as distinct from the symptom that first appeared in the control room? And what has to change, in design, in protection settings, or in operating procedure, so the failure does not recur?

For many owners and operators, those questions currently have no dedicated owner. A maintenance team can describe the symptom. An OEM can point to warranty terms. But a forensic, independent, engineering-grade answer to why an asset failed, and what to do about it, is often missing from the process entirely.

What Is Root Cause Analysis in Independent Engineering?

Root cause analysis is not a new discipline in engineering, but it is a new solution for independent engineering as it has traditionally been practiced. The premise is straightforward: go in, look at a failure of almost any kind, whether mechanical, electrical, or control-system in nature, and come up with a solution. Historically, in-house engineering support addresses system failure according to company policy as standard practices are not typically available or leveraged for bespoke failure assessment. If outside assistance is required, consultancy typically starts with equipment manufacturers which are inherently biased. The case for independent review is clear; using uniform third-party best practices to methodically determine failure is a far better approach than either the equipment supplier or the system engineer essentially assessing their own work with a bias to protect their product or their system installation. EPE Independent Engineering goes a step farther; the assessment isn’t limited to the mechanical system design in-house but the entire system topology of the project’s operating environment can be scrutinized for failure contributions if required. EPE has unbiased engineering staff and grid intelligence expertise combined.

The procedure then involves tracing an event back past its first visible symptom to the condition, design decision, or operating practice that caused it, then translating that finding into a corrective action a client can implement with confidence and finance partners, insurance providers, litigators, and other partners will recognize as expert assessment.

When done well, root cause analysis closes the loop between an incident report and an engineering fix, rather than leaving a client with a description of what broke and no clear path to preventing it from breaking again. That is the gap this service is built to close: not another inspection, but a structured investigation that ends in a solution.

A Regulatory Tailwind Is Building: Is Your IBR Root Cause Process Already Behind?

Part of what is driving renewed attention to root cause analysis is a shifting regulatory landscape around inverter-based resources. PRC-030-1, a new NERC reliability standard still moving through development under FERC Order 901, would require generator owners operating IBRs on the bulk electric system, and qualifying non-BES IBRs of 20 MVA or more at 60 kV and above, to identify reportable performance events, analyze their root causes, and implement corrective actions with documentation of what was found, what was changed, and whether it worked.

The standard is not yet final; it is still awaiting FERC approval. But owners who wait for a final rule before building the internal capability to investigate and correct IBR performance events will be starting behind. A more immediate, already-active analogy is PRC-004-6, which governs protection system mis-operations and requires a corrective action plan built around much the same structure; a root cause analysis, specific corrective actions, assigned responsibility, an implementation timeline, and verification testing. That structure is a useful model for what a defensible root cause and corrective action deliverable should look like, regardless of which standard eventually governs a given asset.

From Forensic Finding to Corrective Action: A New Solution When Something Goes Wrong

EPE is expanding its Independent Engineering practice to offer root cause analysis, built on the same platform that has long supported interconnection, system studies, and owner's engineering work. The new offering centers on forensic failure analysis, investigating mechanical, electrical, and control-system failures to establish what actually happened and why, paired with corrective action planning that turns those findings into a concrete, implementable plan.

For events that end in a dispute, a claim, or litigation, EPE also supports expert witness work, bringing the same independent, engineering-grade analysis into a forum where it must withstand scrutiny.

Because the root cause and NERC compliance sides of a failure investigation call on different expertise, EPE pairs our own generation-asset and mechanical failure analysis background with subject matter experts on the NERC regulatory side, so a. A single engagement can address both the physical cause of a failure and its compliance and reporting implications.

Who Does EPE’s Root Cause Analysis Solution Serve?

The clients best positioned to benefit from this service are the same ones already relying on EPE for independent engineering across the project lifecycle:

• Independent power producers and generation owners managing operating assets.,
• Renewable developers absorbing cycling stress and performance risk from accelerating renewables integration.
• Lenders and investors who need a defensible, third-party account of why an asset underperformed or failed before they commit further capital.

Predictive maintenance and condition monitoring trends already point to where this exposure is concentrated, including boiler tube leaks and HRSG leaks tied to cycling stress from renewables integration. Emerging industry data on battery storage asset failures suggests that older assets, and assets managed in-house rather than by a third party, fail more often. Neither is a substitute for a project-specific investigation, but both illustrate why owners across generation technologies are increasingly asking the same question: when something fails, who do we call to find out why, and what do we do next?

Is Your Team Equipped to Deliver Defensible Root Cause Analysis on IBR Events?

Don't wait for a final rule to start building the internal capability your organization needs. EPE's experts can help you design a defensible root cause analysis and corrective action process for your IBR fleet that's structured to meet emerging requirements and stand up to scrutiny, regardless of which standard ultimately applies.

Contact EPE's experts using the form below to learn more and subscribe to Watt's Current newsletter for more industry updates.