A Coordinated Electric System Interconnection Review—the utility’s deep-dive on technical and cost impacts of your project.

Challenge: Frequent false tripping using conventional electromechanical relays
Solution: SEL-487E integration with multi-terminal differential protection and dynamic inrush restraint
Result: 90% reduction in false trips, saving over $250,000 in downtime

The rapid growth of inverter-based resources (IBRs) including solar PV, wind, battery energy storage systems (BESS), and hybrid facilities has fundamentally changed how the Bulk Power System (BPS) operates. While these resources bring flexibility and decarbonization benefits, they also introduce new reliability risks if not properly modeled, operated, and governed.

To address these challenges, the North American Electric Reliability Corporation (NERC) launched the IBR Registration Initiative, a multi-year effort to bring previously unregistered BPS-connected IBR owners and operators under the NERC compliance framework. As of May 2025, the initiative has entered its third and final phase: registration with a firm compliance effective date of May 15, 2026 for newly registered Category 2 entities

This article explains:

What Category 2 Generator Owner (GO) and Generator Operator (GOP) registration means
Who must register and why
Key timelines, documentation, and risks
How Keentel Engineering supports IBR owners through registration and ongoing NERC compliance

NERC revised its Rules of Procedure (ROP) to formally define Category 1 and Category 2 Generator Owners and Operators. Category 2 primarily captures IBR facilities that were historically outside the NERC compliance registry but now meet revised Bulk Electric System (BES) and aggregation criteria

In practical terms, Category 2 typically includes:

Solar, wind, BESS, and hybrid facilities
Aggregated resources ≥ 20 MVA
Facilities interconnected at ≥ 60 kV
Assets connected to the BPS, even if individually smaller

If a facility aggregates with others to exceed the threshold at a common point of connection, all participating facilities become Category 2 assets, triggering registration obligations

Many IBR owners are encountering NERC registration for the first time. This is not a paperwork exercise it is a fundamental shift in regulatory exposure.

Once registered, Category 2 GO/GOPs become subject to:

Mandatory NERC Reliability Standards
Audit readiness expectations
Model validation, protection, and performance requirements
Event reporting, disturbance analysis, and coordination obligations

Failing to engage early increases the risk of:

Incomplete or incorrect registration
Delayed approvals
Compliance gaps at the May 2026 enforceability date

NERC and the Regional Entities have been clear: timely cooperation is mandatory, not optional

Entities must submit detailed technical and contractual information through CORES or a Regional Entity secure portal, including

Completed GO/GOP Asset Verification Form
Interconnection Agreement (and amendments)
Operating and third-party O&M agreements
Electrical one-line diagrams (from resource to POI)
Inverter or turbine nameplate data

This documentation is not just administrative—it becomes the foundation for:

BES applicability determination
Compliance scope
Future audits and enforcement actions

Do I still need to submit documentation if I believe my asset does not meet Category 2 criteria?
Yes. Self-determinations do not replace Regional Entity evaluations. All requested documentation must be submitted before a formal decision is issued
What if I don’t yet know who my GOP will be?
Register as both GO and GOP. The registration can be revised later once a formal GOP is designated
When do GADS requirements begin?
GADS reporting is not required until May 15, 2026, but early confirmation submissions are recommended
Can Category 2 entities join the Coordinated Oversight Program?
Yes, provided the organization operates in two or more Regional Entities. Any changes will be formally processed after the registration effective date
What is E-ISAC and why does it matter?
E-ISAC provides threat intelligence for cyber and physical security risks and is a free benefit of NERC registration, offering significant operational value to new registrants

In 1995, Sonny Patel earned his Electrical Engineering degree from the University of Illinois. But degrees don't build legacies — action does.

For three decades, he has worked the power industry from every side of the table: 16 years as a utility engineer at Exelon/Commonwealth Edison; generation leadership across hydroelectric, industrial steam turbine, and a 9 GW renewable fleet; NERC Regional Entity Senior Compliance Engineer and Audit Team Lead, auditing some of the nation's largest utilities; and testing and commissioning lead on equipment up to 765 kV — the very top of the North American grid.Utility. Generator. Regulator. Consultant. Few engineers have seen all four seats. Fewer still have sat in them.

His experience spans nuclear, hydro, conventional generation, renewables, oil and gas, mining — and today's data centers, where he is authoring a three-book series on data center design. He is a Licensed Professional Engineer in six states and a Licensed Electrical Contractor in Florida (Unlimited EC) — he doesn't just design the work; he's qualified to stand behind its execution.Today, as Founder and CEO of Keentel Engineering, Sonny leads a nationwide team of engineers delivering substation design, power system studies, NERC compliance, and commissioning — done right, coast to coast.Three decades. Every side of the table. One standard: accountable engineering.

In 1995, Sonny Patel earned his Electrical Engineering degree from the University of Illinois. But degrees don't build legacies — action does.

Utility. Generator. Regulator. Consultant. Few engineers have seen all four seats. Fewer still have sat in them.

Today, as Founder and CEO of Keentel Engineering, Sonny leads a nationwide team of engineers delivering substation design, power system studies, NERC compliance, and commissioning — done right, coast to coast.Three decades. Every side of the table. One standard: accountable engineering.