PRC-029 Compliance Deadlines

The team at Utility Services has been following NERC’s upcoming requirements for Inverter-Based Resources: PRC-028, PRC-029, and PRC-030.  This trio of standards approved in 2025 seeks to increase stability of the Bulk Electric System (BES) by ensuring IBRs do not adversely impact grid reliability during system disturbances.

PRC-029 Implementation Dates
PRC-029 specifically establishes IBR Ride-through requirements during and after defined frequency and voltage excursions on the BES.  One of the frequently asked questions we’ve received is the confusion around the implementation date of this new standard.  Timing of this will vary depending on facility configuration and applicability.

• For existing BES Inverter-Based Resources, October 1st, 2026, is the most cited date to have required modifications in place, however some sites may have longer to make adjustments. Depending on facility configuration, commercial operating date, and applicability – initial implementation may even be stretched out to April 1, 2028.  The following table helps clarify many of the factors affecting PRC-029 compliant dates for BES IBRs (Cat 1 Generation).

• Non-BES IBRs (Cat 2 Generation) have a longer implementation timeframe, especially existing sites. Though certain requirements must be met at the beginning of 2027, operational requirements may be stretched to 2030.  However, any sites with a COD of 5/15/2026 or later are expected to be fully compliant by 2027.

As these tables demonstrate, there are many factors that can change PRC-029 implementation dates for IBR sites.  Utility Services is glad to help your team navigate through these complexities and create a roadmap for compliance.  Understanding these dates leads us to another key question – What are my options for Modifications to be compliant with PRC-029-1?

Options for PRC-019 Modifications
If modifications are necessary to fulfill the Ride-through requirements of PRC-019, there are generally two approaches:

• OEM Executed Implementation – This option typically comes with a much higher cost, but lowest commercial risk. Depending on specific agreements, the OEM may insist on this approach as non-OEM modifications could be considered a breach of a warranty contract.
• Qualified Third Party Engineering Implementation – By utilizing an established third party for modifications, costs will generally be lower – and savings can be significant depending on site configuration. However, warranty/post-implementation support may depend on specific contract terms.

The Utility Services’ team may not be able to make the final implementation strategy for your entity, but we are glad to help guide you through the process.  As you speak to both OEM representatives and qualified third-party engineers, it’s crucial to ask the right questions and ensure you make the best decision for your organization.  If you have any questions or would like help connecting with a qualified third-party engineering solution, don’t hesitate to reach out.