PRC-028-1 compliance is now in effect, and the countdown has begun.
Generator owners with inverter-based resources must ensure that 50% of applicable assets are compliant by April 1, 2028, and 100% by January 1, 2030.
While April 1, 2025, marked the effective date of the standard, these compliance deadlines give owners time to act—but the work is significant, especially for brownfield sites. That’s why NEI is helping clients take proactive steps now.
Why NERC Created PRC-028
PRC-028 was introduced following a series of events that exposed critical visibility gaps in inverter-based resources (IBRs) (Technical Rationale for Reliability Standard PRC-028-1). These events made it clear that existing standards were not built to handle the behavior of modern solar, wind, and battery systems during faults.
To address these risks, NERC established PRC-028 to ensure that high-speed disturbance data is available for event analysis, performance monitoring, and validation of inverter-based resource models. For developers and owners, this is more than a compliance checkbox; it’s an opportunity to future-proof assets, protect revenue, and prove reliability in an increasingly competitive market.
What Developers Need to Know
Scope: If your wind, solar, BESS, or HVDC facility has an aggregate nameplate ≥ 20 MVA and connects at ≥ 60 kV, PRC-028 now applies (PRC-028-1 – Disturbance Monitoring and Reporting Requirements for Inverter-Based Resources).
Deadlines
- 50% of applicable existing assets must be compliant by April 1, 2028
- 100 % by January 1, 2030.
- For new projects:
- COD between April 2, 2025, and September 30, 2026, must comply within 15 months
- COD after October 1, 2026: Must comply at COD
Data Requirements
Unlike PRC-002, which focuses on the broader Bulk Electric System, PRC-028 specifically targets IBRs and ride-through performance. It calls for high-resolution event data.
The following table summarizes the eight key requirements of PRC-028 and explains why each one is important.
PRC-028 Compliance Requirements
| R# | What it Demands | Why It Exists |
| R1 | Sequence-of-Event (SER) breaker & inverter status | Fault chronology |
| R2-R3 | Triggered Fault Recording (FR) voltages, currents, power—64 s/c | Oscillography |
| R4-R5 | Continuous Dynamic Disturbance Recording (DDR)—960 sps | Long-duration dynamics |
| R6 | Time-sync to UTC ±1 ms | Data correlation |
| R7 | 15-day turnaround on data requests | Faster event analysis |
| R8 | Restore failed recorders ≤ 90 days | Reliability follow-through |
Four Risks of Waiting
While final compliance deadlines are years away, early planning helps avoid challenges like retrofit delays and scheduling conflicts.
- Retrofit Rush: Lead times, outages, and installation schedules can stack up across multiple sites
- Interconnection and EPC Agreements: PRC-028 deliverables are now appearing in interconnection and EPC agreements
- Audit Possibility: PRC-028 is an auditable requirement, and regulators may request evidence before deadlines
- Lost Revenue: Delayed compliance could impact interconnection approval or project energization
NEI’s PRC-028 Compliance Solution™: How We Simplify the Process
NEI simplifies the process with a proven retrofit solution, from site audit to compliance documentation.
- Gap Assessment: We map every turbine, inverter, and feeder against R1-R8 and provide recommended next steps
- Design & Integration: Vendor-neutral engineering of SER, FR, DDR solutions—from simple relay firmware unlocks to full digital overlays
- Field & Testing and Installation: Our engineers install, commission, and time-sync on-site when necessary.
- Audit-Ready Docs: Compliance report and sample data to make compliance easy and provide guidance in the event of an audit.
Ready to get started?
Use our PRC-028 Configurator to quickly scope your retrofit options—or contact our team to schedule a portfolio-wide compliance consult.