N-1Application
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BEFORE THE NOVA SCOTIA ENERGY BOARD OF THE PROVINCE OF NOVA SCOTIA North American Electric Reliability ) Corporation ) THIRD QUARTER 2025 APPLICATION FOR APPROVAL OF RELIABILITY STANDARDS OF THE NORTH AMERICAN ELECTRIC RELIABILITY CORPORAT...
AI summary The document is an application for the approval of reliability standards by the North American Electric Reliability Corporation (NERC) before the Nova Scotia Energy Board. It outlines a proceeding related to reliability standards in the third quarter of 2025.
November 25, 2025 I. NOTICE AND COMMUNICATIONS 3 II. REQUEST FOR APPROVAL OF RELIABILITY STANDARDS 3 A. B. C. 1. BACKGROUND: NERC QUARTERLY FILING OF PROPOSED RELIABILITY STANDARDS 3 OVERVIEW OF NERC RELIABILITY STANDARDS DEVELOPMENT PROCE...
AI summary The document outlines an application by the North American Electric Reliability Corporation (NERC) for the approval of new reliability standards in the third quarter of 2025. It includes background information on NERC, the reliability standards development process, and descriptions of proposed standards such as PRC-024-4 and EOP-012-3.
eview process for considering 4 See Memorandum of Understanding between Nova Scotia Utility and Review Board and North American Electric Reliability Corporation (signed Dec. 22, 2006). 5 See Memorandum of Understanding between Nova Scotia...
AI summary The NSUARB has established a process for reviewing NERC's proposed reliability standards, requiring FERC approval before processing applications. The NSUARB does not require approval for Violation Risk Factors and Severity Levels but will accept them as guidance.
B. Overview of NERC Reliability Standards Development Process NERC Reliability Standards define the requirements for reliably planning and operating the North American BPS. These standards are developed by industry stakeholders using a bal...
AI summary This section outlines the process by which NERC develops reliability standards for the North American bulk power system. These standards are created through an open, inclusive, and fair process managed by the NERC Standards Committee, involving industry stakeholders. Standards are approved by stakeholders through a balloting process and then adopted by the NERC Board of Trustees and relevant governmental authorities.
Reliability Standards Reliability Standard Effective Date Protection and Control (PRC) PRC-024-4 10/1/2026 PRC-029-1 10/1/2026 Emergency Preparedness and Operations (EOP) EOP-012-3 10/1/2025 \ At the time of this filing, the standards mark...
AI summary The document outlines reliability standards for the electricity sector, including Protection and Control (PRC-024-4 and PRC-029-1) and Emergency Preparedness and Operations (EOP-012-3), with effective dates of 10/1/2026 and 10/1/2025, respectively. These standards have been approved by FERC and are set to become mandatory in the future.
Planning and Operational Studies Requirements for all IBRs (completion: November 4, 2026). Reliability Standards PRC-024-4 and PRC-029-1 relate to Generator Ride-through and are part of Milestone 2. Reliability Standard PRC-029-1 establish...
AI summary The document outlines the requirements for Planning and Operational Studies for Inverter-based Resources (IBRs) under Reliability Standards PRC-024-4 and PRC-029-1. These standards focus on generator ride-through performance, ensuring IBRs maintain reliability during disturbances and defining criteria for synchronous generators and wind units.
2. EOP-012-3 On September 18, 2025, FERC issued an order approving Reliability Standard EOP-012- 3 as well as the associated implementation plan,18 Violation Risk Factors and Violation Severity Levels, and the revised definition of the ter...
AI summary On September 18, 2025, FERC approved Reliability Standard EOP-012-3, which addresses the effects of extreme cold weather on generating units by requiring Generator Owners to implement mitigation plans. This standard replaces EOP-012-2 and includes revised definitions and risk factors.
Revised definition of Generator Cold Weather Constraint: FERC also approved a revised definition of Generator Cold Weather Constraint that is defined as: "Any condition that would preclude a Generator Owner from implementing freeze protect...
AI summary FERC approved a revised definition of Generator Cold Weather Constraint, which includes measures to ensure generators can implement freeze protection during cold weather. The new standard, EOP-012-3, includes nine requirements, including a periodic review of constraints every 36 months.
III. CONCLUSION NERC respectfully requests that NSEB approve the Reliability Standards as specified herein. Respectfully submitted, /s/ Sarah P. Crawford Lauren Perotti Assistant General Counsel Sarah P. Crawford Senior Counsel Alain Rigau...
AI summary NERC requests that NSEB approve the Reliability Standards as specified. The submission includes legal counsel from NERC and contact details for the involved parties.
Exhibit A-1 Reliability Standards Applicable to Nova Scotia, Approved by FERC in Third Quarter 2025
AI summary This exhibit lists the reliability standards applicable to Nova Scotia, which were approved by the FERC in the third quarter of 2025.
Exhibit A-2 Informational Summary of Reliability Standards Applicable to Nova Scotia, Approved by FERC in Third Quarter 2025
AI summary This exhibit provides an informational summary of reliability standards applicable to Nova Scotia, approved by the FERC in the third quarter of 2025. It outlines the standards relevant to the region's electricity grid and operations.
Exhibit A-2: Informational Summary of Reliability Standards Applicable to Nova Scotia, Approved by FERC in Third Quarter 2025 Purpose Applicability Reliability Standard PRC-024-4 To assure that protection of synchronous generators, type 1...
AI summary Exhibit A-2 outlines three reliability standards (PRC-024-4, PRC-029-1, and EOP-012-3) approved by FERC in 2025. These standards ensure the protection of generators, wind resources, and synchronous condensers during frequency and voltage excursions, and address reliability impacts of extreme cold weather on generating units.
A. Introduction 1. Title: Frequency and Voltage Protection Settings for Synchronous Generators, Type 1 and Type 2 Wind Resources, and Synchronous Condensers 2. Number: PRC-024-4 3. Purpose: To assure that protection of synchronous generato...
AI summary The document outlines the purpose of PRC-024-4, which is to ensure that the protection settings for synchronous generators, type 1 and type 2 wind resources, and synchronous condensers do not lead to unnecessary tripping during frequency and voltage fluctuations that impact the Bulk Power System (BPS).
4.2. Facilities2: - 4.2.1 Frequency, voltage, and volts per hertz protection (whether provided by relaying or functions within associated control systems) that respond to electrical signals and: (i) directly trip the generating resource(s)...
AI summary This section outlines specific protection requirements for frequency, voltage, and volts per hertz in the Bulk Electric System (BES), including protections for synchronous generators, transformers, and wind resources. It also specifies exemptions for auxiliary equipment and references an implementation plan for PRC-024-4.
Violation Severity Levels Violation Severity Levels R2. N/A N/A N/A The Generator Owner or Transmission Owner failed to set its applicable voltage protection so that it does not trip according to Requirement R2.
AI summary The document outlines a violation related to voltage protection settings, where the Generator Owner or Transmission Owner failed to set the applicable voltage protection to prevent tripping as required by R2.
This Variance adds a VSL for D.A.5 and modifies the VSL for R2 as follows: Violation Severity Levels R # Lower VSL Moderate VSL High VSL Severe VSL D.A.2. N/A N/A N/A The Generator Owner or Transmission Owner failed to set its applicable v...
AI summary This Variance modifies the Violation Severity Levels (VSL) for D.A.5 and adds a VSL for D.A.2, outlining different levels of severity for violations related to voltage protection settings and the designation of strategic power plants by the Planning Coordinator.
Table 1: Frequency Boundary Data Points - Eastern Interconnection High Frequency Duration Low Frequency Duration Frequency (Hz) Minimum Time (Sec) Frequency (Hz) Minimum Time (sec) ≥61.8 Instantaneous10 ≤57.8 Instantaneous11 ≥60.5 10(90.93...
AI summary Table 1 presents frequency boundary data points for the Eastern Interconnection, specifying thresholds and durations for high and low frequency conditions, including formulas and continuous operation parameters. It notes that areas outside the 'No Trip Zone' are not 'Must Trip Zones.'
Table 2: Frequency Boundary Data Points – Western Interconnection High Frequency Duration Low Frequency Duration Frequency (Hz) Minimum Time (Sec) Frequency (Hz) Minimum Time (sec) ≥61.7 Instantaneous11 ≤57.0 Instantaneous11 ≥61.6 30 ≤57.3...
AI summary Table 2 presents frequency boundary data points for the Western Interconnection, detailing the minimum time durations for various high and low frequency thresholds. This data is critical for understanding frequency stability and operational requirements within the bulk-power system.
PRC-024 — Attachment 2 (Voltage No-Trip Boundaries – Eastern, Western, and ERCOT Interconnections) Figure 5: Voltage No-Trip Boundaries – Eastern, Western, and ERCOT Interconnections
AI summary This document provides a visual representation of voltage no-trip boundaries for the Eastern, Western, and ERCOT interconnections, which are critical for ensuring grid reliability and stability in power systems.
Table 6: High Voltage Boundary Data Points – Quebec Interconnection High Voltage Duration for all Synchronous Generators and Condensers High Voltage Duration for strategic Power Plants Voltage (per unit) Minimum Time (sec) Voltage (per uni...
AI summary The text presents two tables detailing high and low voltage boundary data points for the Quebec Interconnection, including voltage thresholds and minimum durations for synchronous generators, condensers, and strategic power plants. It also references an attachment providing voltage boundary clarifications.
shall also retain evidence of actual disturbance monitoring (i.e., sequence of event recorder, dynamic disturbance recorder, and fault recorder) data to demonstrate that the IBR failed to Ride-through during a phase jump of greater than or...
AI summary The document outlines requirements for Generator Owners to ensure IBR voltage performance during voltage excursions, specifying that tripping should not occur unless necessary, with exceptions for documented hardware limitations. It also emphasizes the need for evidence of disturbance monitoring and coordination with reliability entities.
Attachment 2: Frequency Ride-Through Criteria Table 3: Frequency Ride-through Capability Requirements System Frequency (Hz) Minimum Ride-Through Time (sec) > 61.8 May trip > 61.2 299 ≤ 61.2 and ≥ 58.8 Continuous < 58.8 299 < 57.0 May trip...
AI summary Attachment 2 provides frequency ride-through capability requirements for the Bulk-Power System. The table outlines minimum ride-through times for different system frequency ranges, with specific measurements taken at the high-side of the main power transformer.
- 2. Frequency is measured over a period of time (typically 3-6 cycles) to calculate system frequency at the high-side of the main power transformer. - 3. Instantaneous or single points of measurement may not be used in the determination o...
AI summary The text outlines frequency ride-through requirements for IBR, specifying that frequency is measured over multiple cycles, instantaneous measurements are not used, and IBR must ride-through unless the duration exceeds specified limits. These requirements are cumulative over disturbances within a 10-minute period.
nt implementation plan. "Good faith" in this context refers to a sincere intention to comply with Reliability Standard EOP-012-3 regarding all requirements based on the calculation of the Extreme Cold Weather Temperature for each applicabl...
AI summary The text outlines the implementation plan for compliance with Reliability Standard EOP-012-3, emphasizing 'good faith' efforts by entities to comply with requirements related to Extreme Cold Weather Temperature calculations. Entities are required to participate in compliance monitoring activities by the CEA and submit requested documentation.
- 2. The implementation of a specific freeze protection measure would exceed a manufacturer's design limitation and the exceedance is expected to functionally impair or degrade the effective operation of the impacted component or system. -...
AI summary The document outlines conditions under which freeze protection measures for generators may not be implemented, including when they exceed design limitations, are technically infeasible, or negatively impact system reliability. These determinations are based on engineering analysis, operating experience, and reliability considerations.
List of Currently Effective NERC Reliability Standards BAL-001-2 Real Power Balancing Control Performance BAL-001-TRE-2 Primary Frequency Response in the ERCOT Region BAL-002-3 Disturbance Control Standard – Contingency Reserve for Recover...
AI summary The document lists currently effective NERC Reliability Standards, focusing on power balancing, frequency response, cyber security, and communication protocols for the Bulk Electric System (BES). These standards ensure reliability and security in the electricity grid.
Change History The first three sections identify all terms that have been adopted by the NERC Board of Trustees for use in continent-wide standards; the Regional definitions section identifies all terms that have been adopted by the NERC B...
AI summary This section of the document outlines the Change History, explaining how terms were adopted by the NERC Board of Trustees for use in continent-wide and regional standards, including the development of Version 0 standards and subsequent additions following board adoption, FERC filing, and final approval.
Any comments regarding this glossary should be reported to the NERC Help Desk. Select "Standards" from the "Service" drop-down menu and "Other" from the Standards Subcategory drop-down menu. Subject to Enforcement Continent-wide Term Link...
AI summary The text provides definitions and details related to electric reliability standards, including terms such as 'ACE Diversity Interchange' and 'Actual Net Interchange,' along with their adoption dates, FERC approval dates, and effective dates. These standards are subject to enforcement and are managed by entities like NERC.
2 FERC approved the WECC Tier One Reliability Standards in the Order Approving Regional Reliability Standards for the Western Interconnection and Directing Modifications, 119 FERC ¶ 61,260 (June 8, 2007). In that Order, FERC directed WECC...
AI summary FERC approved the WECC Tier One Reliability Standards in an order dated June 8, 2007, directing WECC to address inconsistencies between regional definitions and the NERC Glossary in developing permanent replacements.
3 FERC approved the WECC Tier One Reliability Standards in the Order Approving Regional Reliability Standards for the Western Interconnection and Directing Modifications, 119 FERC ¶ 61,260 (June 8, 2007). In that Order, FERC directed WECC...
AI summary FERC approved the WECC Tier One Reliability Standards in 2007 and directed WECC to address inconsistencies with NERC Glossary definitions. Replacement standards were filed in 2009. The document includes definitions related to reliability standards, such as 'Secondary Inadvertent Interchange' and 'Security-Based Misoperation'.