You Are Now a NERC Registered Entity. What Does That Actually Mean?

A Plain-English Guide to the IBR Registration Initiative — What NERC Was Trying to Fix, Why Your Solar, Wind or Storage Project Was Pulled In, and What You Are Responsible For Now

1. In Plain Terms: What Happened

On 15 May 2026, several hundred solar, wind and battery storage companies woke up subject to a body of federal reliability rules they had never had to follow before. Most of them had done nothing wrong. Their projects had simply been too small, or connected in the wrong way, to fall inside the old rules — and the rules changed.

This paper explains what happened, in ordinary language. What NERC was trying to fix. Why your project was caught. What you are now responsible for. And what to do if you are one of the owners who has only just realised this applies to you.



The short version is this. North America has an organisation called NERC that writes and enforces mandatory rules for keeping the electric grid stable. For decades, those rules only reached large power plants. As solar, wind and storage grew, thousands of smaller projects ended up connected to the grid but outside the rules — invisible to the people responsible for keeping the lights on. After several large disturbances where inverter-based projects disconnected unexpectedly and made things worse, the federal energy regulator told NERC to fix it. NERC did, by widening who has to register.

If you own or operate an inverter-based project of at least 20 MVA connected at 60 kV or above — counting projects that share a connection point together — you were probably caught. You are now what NERC calls a Category 2 Generator Owner, or a Category 2 Generator Operator, or both.

2. The Problem NERC Was Trying to Solve

It helps to understand why any of this happened, because the reasoning explains most of the obligations that follow.



A traditional power plant uses a large spinning machine. Spinning machines are heavy, they behave in predictable ways when the grid has a problem, and they tend to ride through disturbances because physics makes them do so.

Solar farms, wind farms and battery storage do not work that way. They connect through inverters — electronic devices that convert direct current into alternating current and decide, in software, exactly what to do from one millisecond to the next. That is a genuine advantage in many ways. It is also a risk, because what an inverter does during a grid disturbance is whatever its settings tell it to do.

Over the past decade there have been repeated events where a fault on the transmission system was cleared normally, and hundreds or thousands of megawatts of inverter-based generation disconnected anyway. The grid lost generation it was counting on, for a fault that should have been a non-event. In several of those investigations the same finding appeared: nobody had complete information about what was connected, what settings it had, or how it would behave.

That is the problem. Not that inverter-based projects are bad, but that a growing share of the generation fleet was operating outside the framework that keeps track of these things. NERC could not model what it could not see, and could not require performance from owners it had no authority over.

So the federal regulator issued two directions. First, find these owners and register them. Second, write new reliability rules covering how inverter-based projects must be modelled, monitored and how they must perform during disturbances. The first of those became the IBR Registration Initiative. The second is still in progress.

3. Who NERC Is, and Who Actually Contacts You

A few names, kept simple.



• FERC — the Federal Energy Regulatory Commission — is the United States federal energy regulator. It does not write the reliability rules itself. It approves them and directs the organisation that does.
• NERC — the North American Electric Reliability Corporation — is that organisation. Congress created the role in 2005 and FERC designated NERC in 2006. NERC writes the reliability rules, called Reliability Standards, and enforces them. Its rules cover the United States and, through separate arrangements, much of Canada.
• The six Regional Entities do most of the day-to-day work. NERC delegates authority to them. In practice your Regional Entity is who contacts you, who reviews your registration, and who audits you. Which one applies depends on where your project physically connects to the grid, not where your company is based.
• The ERO Enterprise is simply NERC and the six Regional Entities together.
• E-ISAC — the Electricity Information Sharing and Analysis Center — is a separate arm of NERC that shares information about cyber and physical security threats. Membership is free for registered entities and it is deliberately kept separate from enforcement, so engaging with it does not create compliance exposure. It is a genuine benefit and many new registrants do not know it exists.

If you own projects that connect in more than one region, you may deal with more than one Regional Entity, each on its own schedule. There is a programme called Coordinated Oversight that reduces duplication for entities in two or more regions, and it is worth asking about if that describes you.

4. What "Registered" Really Means

Registration is not a licence or a certification. It is a determination that certain mandatory rules now apply to your organisation, and that you can be audited and penalised against them.

Three things follow from it, and all three surprise people.



• The rules apply to functions, not companies. NERC registers you as performing a role — Generator Owner, Generator Operator, or both. The obligations attach to the role. If you own a project but a third party operates it, you may be the Generator Owner while they are the Generator Operator, and each of you carries a different set of requirements.
• Compliance means being able to prove it. It is not enough to do the right thing. You must hold records demonstrating that you did it, for the retention periods the rules specify. An auditor who cannot see evidence treats the requirement as unmet.
• There is no informal grace period. Once the registration is effective, the applicable requirements are enforceable. NERC has been supportive and has run outreach sessions, and that support is real — but it is not an extension.

Enforcement carries financial penalties. They are assessed by requirement and can accrue per day. The purpose of saying so is not alarm; it is that a compliance programme is cheaper than a violation, and the people who need to hear that are usually the ones deciding whether to fund it.

5. Category 1 and Category 2, Explained Simply

NERC changed its own rulebook — the Rules of Procedure — to create two categories of Generator Owner and Generator Operator. The distinction confuses people because the numbers sound like ranks. They are not.

That last point matters for two audiences. If you are newly registered, do not assume Category 2 means a lighter version of the rules. And if you were already registered, do not skim the notice that relabelled you — the applicability tables and compliance date documents are now written in terms of categories, so you need to know which one you are reading about.

6. The Aggregation Rule: Why Your Neighbours Matter

This is the part most owners did not see coming, and it deserves its own section.

The threshold is not just about your project. NERC’s criteria look at facilities that aggregate to 20 MVA or more at a common point of connection at 60 kV or higher. If several separate projects share a connection point and together cross that line, then all of those facilities are Category 2 assets, and all of their owners and operators must register.



Read that again if you own something small. A six megawatt project that would never approach the threshold on its own can be pulled in because two or three other projects share its point of connection. You may have no commercial relationship with those owners. You may not know who they are.

The practical consequences are worth stating plainly.

• Your registration status is partly determined by parties you do not control. It can change if someone else connects at your point of connection.
• You cannot assess this from your own nameplate. It requires knowing what else is behind the same point of connection, which usually means asking the transmission owner or distribution provider who provides that connection.
• It is a live diligence question. If you are buying a project, or lending against one, whether the aggregation criteria are met is now a real item — and NERC’s Compliance Registry is a public spreadsheet, so registration status can be checked.
  

7. How We Got Here

The initiative ran in three phases over three years.

By the time NERC filed its progress update in April 2026, it had sent registration notification letters covering every identified candidate: 449 organisations, representing 531 facilities. Of those 449, some 127 were companies already registered that were adding a Category 2 function. The remaining 322 were organisations registering with NERC for the first time in their existence.



That number is the human scale of this. Three hundred and twenty-two companies, many of them small, with no compliance department and no prior experience of a federal reliability audit, became registered entities on the same day.

8. Where Things Stand Today

As of this writing, the following is true.



• Registration is complete. The initiative reached its final milestone and closed in May 2026.
• The effective date has passed. It was 15 May 2026, roughly four months ago. On that date NERC updated its public Compliance Registry to show the new Category 2 registrations and to relabel existing Generator Owners and Operators as Category 1.
• Obligations are live. Everything the earlier NERC guidance described as starting on 15 May 2026 — including data reporting obligations — started then.
• More rules are coming. The second federal direction, covering new reliability standards for inverter-based resources, is still working through the standards development process.

If you are reading NERC material dated before mid-2026, be careful with it. A great deal of the published guidance is written in the future tense about dates that have passed. It remains useful for understanding the process; it is misleading about what is required now.

9. What You Had to Send In — and Why It Still Matters

During registration, Regional Entities asked for a specific document set, submitted through a secure system called CORES — the Centralized Organization Registration ERO System.

• A completed ERO Enterprise Generator Owner and Generator Operator Asset Verification Form.
• The interconnection agreement, including any amendments.
• Operating or third-party agreements — in practice, the operations and maintenance contract that establishes who operates the plant.
• Operating one-line diagrams showing the generation through to the point of interconnection with the transmission owner or distribution provider.
• Nameplate data for the individual inverters or wind turbines.

That list is worth revisiting even though registration is over, for one reason. If assembling it was difficult — if the one-line was out of date, if nobody could find current inverter nameplate data, if the agreements were scattered across three parties — that is not a registration problem. It is a records problem, and the standards you are now subject to will ask for the same information repeatedly and in more detail.



An owner who struggled to produce a current one-line for registration will struggle far more with the modelling data requirements, which need the electrical characteristics behind that one-line and updated whenever the plant changes.

10. What You Now Owe

This is the question everyone asks and the published material answers indirectly. There is no single list that applies to everybody, because applicability depends on your registered functions, your equipment and your location. NERC publishes two documents that answer it for your specific case, and they are the most useful things on the website.



• The Functional Applicability spreadsheet, which shows which Reliability Standards apply to which registered functions.
• The Reliability Standards Compliance Dates for Generator Owners and Generator Operators document, updated quarterly, which gives the dates on which each standard becomes enforceable for Category 2 entities.

In broad terms, the obligations fall into four groups.

One date deserves specific mention. The reliability standard covering frequency and voltage ride-through for inverter-based resources takes effect on 1 October 2026. If you own inverter-based generation, that is weeks away and it is a performance requirement, not a paperwork requirement — your equipment either behaves as specified or it does not.

11. The Two Items People Miss

Two obligations sit outside the main standards framework and are easy to overlook because they arrive by email rather than through a standard.

11.1 Generating Availability Data

Registered generators report availability and outage data through a system called GADS — the Generating Availability Data System. NERC’s guidance said Category 2 entities were not required to submit GADS information until 15 May 2026. That date has passed, so if you qualify for GADS reporting, you are inside it now.

11.2 The Reporting Confirmation

Separately, entities receive a notification asking them to complete a Reporting Confirmation stating whether they meet the GADS reporting criteria. NERC recommended completing it early even before it was strictly required. If you set that email aside during the registration rush, it is worth finding.

Neither of these is difficult. Both are the kind of thing that goes unnoticed in a small organisation until it appears as a finding.

12. The GO and GOP Trap

This one is worth checking today, because a lot of owners walked into it without noticing.

If, at the time of registration, a Generator Owner had not yet decided who its Generator Operator would be, the guidance was that the Regional Entity would advise registering as both Category 2 Generator Owner and Category 2 Generator Operator, until it became clearer who would take the operator role.



That was sensible advice for getting registration done on time. It also means some owners are now carrying both function registrations — and every obligation attached to each — when in reality a third-party operator runs the plant. Nothing corrects that automatically. The registration can be revised, but only if somebody notices it needs revising.

There is a related point for anyone changing operators. When a Generator Operator contract ends and a new provider takes over, the Generator Owner documents the new operator on the Asset Form and provides the new operations and maintenance agreement through CORES. In other words, changing your O&M contractor is now a registration event. Most asset management handover checklists do not yet include it.

13. Four Things People Got Wrong

These came up repeatedly during registration and each one cost somebody time.

"We analysed it ourselves and we do not qualify, so we do not need to respond"

Incorrect. NERC was explicit that even where an organisation concluded its facility did not meet the criteria, it still had to submit the requested documents. The Regional Entity makes the determination, not the owner. Self-assessment was never the decision — it was an input to somebody else’s decision.

"We will not share our data without a non-disclosure agreement"

NERC declined this. No non-disclosure agreement is required between registration candidates and Regional Entities, because the Rules of Procedure already impose confidentiality obligations on NERC and the Regional Entities for information submitted to them. Owners who held out for an agreement spent time they did not have.

"We have facilities in several regions so we will do them all at once"

Not permitted. Each Regional Entity set its own timeframe and each had to be met on its own schedule. Registration approval arrived region by region.

"We will deal with it closer to the deadline"



The volume made that unworkable. Registration was processed in batches across nine months precisely because it could not all happen at the end. The same logic now applies to compliance: the standards have staggered dates and the work cannot be compressed into the last month before an audit.

14. What If You Were Never Contacted?

NERC identified candidates using federal generation data and by asking transmission owners and balancing authorities for contact information. That process was thorough and it was not infallible.

If you own an inverter-based project that meets the criteria — including through aggregation with neighbours — and you were never contacted by a Regional Entity, you are not exempt. You are unregistered, and the criteria applied on 15 May 2026 regardless of whether anyone wrote to you.



The published guidance treats this as a helpdesk matter: contact NERC Registration and they will help identify your Regional Entity. That is the right first step, and the sooner it is taken the better the position looks. An owner who identifies the gap themselves and approaches their Regional Entity is in a materially different posture from one discovered later.

The situations most likely to have been missed are aggregations of small facilities behind a shared connection point, projects that changed ownership during the identification window, and organisations whose contact information in the federal data was out of date.

15. What Is Still Coming

Registration was one of two federal directions. The second — developing new reliability standards for inverter-based resources — is still under way, and it is where the technical requirements live.



• Standards covering disturbance monitoring, ride-through performance, and analysis of unexpected changes in output are moving into effect, with the ride-through standard effective 1 October 2026.
• Model verification and validation requirements are being updated, and were among the standards approved in February 2026 together with new definitions for distributed energy resources, model validation and model verification.
• Further standards projects covering operational studies and planning studies were in the industry comment and ballot process during 2026 and will follow.

The practical implication is that the obligation set is not static. An entity that builds a compliance programme around today’s list and then stops will fall behind. The quarterly compliance dates document exists precisely because the picture keeps moving.

16. What a Compliance Programme Actually Looks Like

For an organisation that has never done this, the phrase "compliance programme" sounds heavier than it is. In practice it is five things.

1. Knowing what applies to you. Working through the Functional Applicability spreadsheet and the compliance dates document for your registered functions, and producing a written list of the standards and requirements you are subject to, with dates. This is the foundation and it is frequently skipped.
2. Assigning each requirement to a person. Not a department — a person, with the authority and the time to do it. Requirements that belong to everybody belong to nobody.
3. Doing the underlying engineering. Models, settings, protection, monitoring and testing. This is real technical work and it is where most of the effort sits for an inverter-based owner.
4. Keeping evidence. Records that demonstrate each requirement was met, retained for the specified period, in a form somebody other than the author can follow. Evidence built as the work happens is straightforward; evidence reconstructed for an audit is expensive and often incomplete.
5. Reviewing it periodically. Standards change, projects change, staff change, and settings change. A programme that is not reviewed drifts out of alignment with the assets it covers.

None of that requires a large organisation. It requires that somebody owns it and that the engineering behind it is done properly.

17. How Keentel Engineering Helps

Keentel Engineering is an electrical power systems engineering firm. We work with owners and operators of inverter-based generation and storage on the engineering that sits underneath these obligations — and on the compliance programme that surrounds it.

17.1 Working Out Where You Stand

• Registration applicability assessment, including the aggregation question — establishing what else sits behind your point of connection and whether the criteria are met.
• Review of your current registration against what you actually own and operate, including the Generator Owner and Generator Operator function question described in Section 12.
• Applicable standards determination for your registered functions, with a written obligation register and dates.
• Gap assessment against that register — what exists, what does not, and what it takes to close it.

17.2 The Engineering Behind the Standards

• Modelling data preparation and submittal, including steady-state and dynamic models, and electromagnetic transient models where required.
• Model verification and validation against test data and disturbance records, including test design and parameter calibration.
• Ride-through capability assessment at the point of interconnection, capability documentation, and support for extension or exemption pathways where equipment cannot comply.
• Disturbance monitoring architecture and data retention design, and post-disturbance performance analysis.
• Protection and control review, settings, coordination studies, relay loadability, and protection system maintenance programmes.
• Voltage control and reactive capability assessment and documentation.

17.3 Building and Keeping the Programme

• Compliance programme development sized to the organisation — obligation register, ownership assignment, evidence structure and review cycle.
• Evidence design, so that records are generated as the work happens rather than assembled afterwards.
• Audit preparation and support, and response to requests for information.
• Ongoing monitoring of standards changes and compliance dates as the framework continues to develop.

17.4 Design and Studies for New and Existing Projects

• Interconnection engineering, point-of-interconnection and substation design, and interconnection application and study support.
• Short-circuit, protective coordination, arc-flash, load flow, harmonic, grid strength and transient stability studies.
• Electromagnetic transient studies for weak-grid stability, control interaction and ride-through verification.
• Owner’s engineer services, design review, and QA/QC of third-party study and model packages.

Keentel Engineering holds a Florida Certificate of Authorization and maintains offices in Tampa, Austin, Sacramento, and Baltimore, supporting projects across the interconnections.

18. References and Further Reading

The following are the primary sources for this paper. NERC materials are updated frequently and some published guidance predates the effective date discussed here; check the publication date of anything you rely on.

The Initiative Itself

• NERC IBR Registration Initiative project page, including milestones, quarterly updates, frequently asked questions and guidance for new registrants  —  North American Electric Reliability Corporation
  https://www.nerc.com/pa/RAPA/Pages/IBR-Registration-Initiative.aspx
• Frequently Asked Questions — IBR Registration Initiative, Category 2 Generator Owner and Generator Operator Registration Process  —  North American Electric Reliability Corporation
  https://www.nerc.com/pa/RAPA/Pages/IBR-Registration-Initiative.aspx
• IBR Registration Initiative quarterly updates, and the registration work plan progress filings made with the Federal Energy Regulatory Commission  —  North American Electric Reliability Corporation
  https://www.nerc.com/pa/Stand/Pages/default.aspx

Registration Criteria and Applicability

• NERC Rules of Procedure — Section 500 on Organization Registration and Certification, Appendix 2 definitions, Appendix 5A registration and certification manual, Appendix 5B statement of compliance criteria, and Appendix 5C on exceptions from the Bulk Electric System definition  —  North American Electric Reliability Corporation
  https://www.nerc.com/AboutNERC/Pages/Rules-of-Procedure.aspx
• Application of the Registration Criteria for Category 2 Generator Owner and Generator Operator inverter-based resources; the Bulk Electric System Definition Reference Document; and Application of the BES Definition to Battery Energy Storage Systems and Hybrid Resources  —  North American Electric Reliability Corporation
  https://www.nerc.com/pa/RAPA/Pages/BES.aspx
• NERC Compliance Registry Matrix — the public record of registered entities and their registered functions  —  North American Electric Reliability Corporation
  https://www.nerc.com/pa/comp/Pages/Registration.aspx

What Applies and When

• Functional Applicability spreadsheet, showing which Reliability Standards apply to which registered functions  —  North American Electric Reliability Corporation
  https://www.nerc.com/pa/Stand/Pages/default.aspx
• Reliability Standards Compliance Dates for Generator Owners and Generator Operators, updated quarterly  —  North American Electric Reliability Corporation
  https://www.nerc.com/pa/Stand/Pages/default.aspx
• NERC Reliability Standards — including the MOD series for modelling data and model verification, the PRC series for disturbance monitoring, ride-through, post-event performance analysis, protection coordination and maintenance, and the VAR series for voltage and reactive control  —  North American Electric Reliability Corporation
  https://www.nerc.com/pa/Stand/Pages/ReliabilityStandards.aspx

Related Technical Standards

• IEEE Std 2800, Standard for Interconnection and Interoperability of Inverter-Based Resources Interconnecting with Associated Transmission Electric Power Systems  —  IEEE Standards Association
  https://standards.ieee.org/ieee/2800/10453/
• Electricity Information Sharing and Analysis Center — membership information for registered entities  —  E-ISAC
  https://www.eisac.com/
  

19. Frequently Asked Questions

Notice and Disclaimer

This document is original technical content prepared by Keentel Engineering LLC for general professional information. It is written in non-specialist language for accessibility and is a summary, not a complete statement of any requirement. It is not legal advice, regulatory advice, or project-specific engineering advice, and it does not constitute a registration determination, an applicability determination, or a compliance determination for any organisation or facility.

Registration criteria, applicable Reliability Standards, compliance dates and process details are established by NERC, the Regional Entities and the applicable regulators, and are revised over time. Descriptions here are current to the date of publication to the best of our knowledge and must be verified against the governing documents and with your Regional Entity before any decision. Where a NERC document, Rule of Procedure, Reliability Standard or Regional Entity instruction differs from this summary, that source governs.



Any organisation uncertain about its registration status or its obligations should contact its Regional Entity or NERC Registration directly.

Keentel Engineering LLC is an independent engineering consultancy. Reference to any regulator, reliability organisation, regional entity, standard, industry organisation, or equipment category in this document does not imply affiliation with, endorsement by, or sponsorship from any such organisation.