N-1Application
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September 28, 2026 Crystal Henwood Clerk of the Board Nova Scotia Energy Board 3rd Floor, Summit Place 1601 Lower Water Street Halifax, NS B3J 3P6 Dear Ms. Henwood: Re: Third Quarter 2026 Application of the Northeast Power Coordinating Cou...
AI summary The Northeast Power Coordinating Council, Inc. has submitted an application to the Nova Scotia Energy Board for approval of revised regional reliability criteria, specifically updates to NPCC Directory #2 Emergency Operations , in accordance with an amended memorandum of understanding dated April 29, 2026.
2. July 2011 Order In an application dated June 29, 2010 ("June 29, 2010 Application"), NPCC applied to the NSUARB for approval of the approved versions of the NPCC Regional Reliability Criteria. In an order and decision dated July 20, 201...
AI summary In July 2011, the NSUARB approved the NPCC Regional Reliability Criteria, making them mandatory in Nova Scotia. The approval also included a quarterly review process for future amendments, which require NSUARB/NSEB approval before becoming mandatory.
2. Description of what constitutes NPCC Regional Reliability Criteria NPCC Regional Reliability Criteria are contained in Directories. The Directory documents contain the NPCC Regional Reliability Criteria in a specific section of each of...
AI summary The NPCC Regional Reliability Criteria are part of the Directories and are designed to implement, augment, or comply with NERC Reliability Standards. They provide regionally specific, more stringent requirements to enhance the reliability and security of the Bulk Electric System.
d characteristics, and the recommendations from the FERC-NERC-Regions Cold Weather reports – Uri and 7 2 Section 313 of the NERC Rules of Procedure. Elliot.[3](#page-7-0) The proposed revisions to the NPCC reliability criteria contained in...
AI summary The proposed revisions to Directory #2 aim to align NPCC reliability criteria with NERC standards and address issues arising from Winter Storms Uri and Elliot. Changes include updates to load shedding requirements, transfer capabilities, and formatting, as well as a review of the reliability criteria's cost-effectiveness.
1.3 Objective The purpose of this Directory is to present the basic factors to be considered in formulating plans and procedures to be followed in an emergency or during conditions which could lead to an emergency , in order to facilitate...
AI summary This document outlines the objective of the Directory, which is to establish factors for planning and procedures during emergencies or conditions that could lead to emergencies. The goal is to prevent service interruptions, minimize system disturbances, and ensure public safety.
1.6.1 Functional Entities (Responsible Entities) - Reliability Coordinator - Balancing Authorities - Transmission Operators
AI summary This section outlines the functional entities responsible for reliability and system operations in the electricity sector, including Reliability Coordinators and Balancing Authorities.
5. NPCC Full Member More Stringent Criteria Requirements These criteria are in addition to and more stringent than or more specific than NERC continent-wide reliability standards. R5.1 The Transmission Operator, Balancing Authority and Rel...
AI summary The NPCC Full Member More Stringent Criteria Requirements outline additional and more specific reliability standards beyond NERC's continent-wide standards. These include rules on normal and emergency transfer capabilities, load shedding procedures, and annual reviews of load shedding plans to ensure system reliability.
2.0 Minimizing the Impact of Events - 2.1 It is recognized that provisions are made in the design of a power system for the satisfactory performance of the system during certain faults or incidents of equipment failure. It is also recogniz...
AI summary This section outlines the importance of designing power systems to handle faults and equipment failures, ensuring sufficient generation and transmission capacity to meet operating reserve, frequency control, and voltage requirements. It also addresses the need to declare emergencies when operating conditions deviate from planned boundaries and follow specific guidelines during such events.
3.0 Operating Under Abnormal Voltage Conditions - 3.1 The bulk power system is operating with abnormal voltage conditions when: - 3.1.1 Actual voltages are outside applicable normal (pre- contingency ) voltage ranges. - 3.1.2 Expected post...
AI summary This section defines abnormal voltage conditions in the bulk power system, specifying scenarios where actual or expected voltages fall outside of normal or emergency criteria as defined by the NPCC following contingencies.
smission Operators should assist by using some or all of the control actions listed in Section 3.2.3.1 where effective and as available, in accordance with their respective voltage control procedures. - 3.2.3.3 If the steps in Sections 3.2...
AI summary The document outlines steps for Transmission Operators to correct abnormal voltage conditions, including modifying transactions, operating hydraulic units, rescheduling pumped hydro units, and requesting assistance from adjacent operators if necessary.
4.1 Correction of Transmission Loading if Exceeding Limits When a Transmission Operator area is experiencing internal circuit or tie line loading in excess of applicable system operating limits, the following actions should be implemented...
AI summary This section outlines the procedures to be followed when transmission loading exceeds system operating limits, including adjusting generation, transferring load, utilizing NERC TLR processes, and implementing emergency transfer capabilities to ensure system reliability and compliance with operating standards.
4.2 Action of a Balancing Authority and Transmission Operator Experiencing an Emergency If a Transmission Operator area is in a transmission emergency because of conditions in another Transmission Operator area, it should implement any of...
AI summary This section outlines the actions a Balancing Authority and Transmission Operator should take during a transmission emergency, including identifying causes, shedding load, rejecting generation, and opening tie lines to ensure reliability and prevent equipment damage.
4.3 Action of a Balancing Authority or Transmission Operator Causing an Emergency If operation in a Balancing Authority or Transmission Operator area is having an adverse reliability impact in another area, the Balancing Authority and Tran...
AI summary This section outlines the obligations of Balancing Authorities and Transmission Operators during emergencies, as mandated by NERC and NPCC Standards. It requires them to identify causes, shed firm load, adjust tie lines, and issue Energy Emergency Alerts to ensure reliability.
5.0 Actions of a Balancing Authority to control Frequency and operate under a Capacity/Energy Emergency 5.1 A Balancing Authority area may from time to time experience difficulty in controlling frequency or ACE . Under these situations, th...
AI summary This section outlines the actions a Balancing Authority should take when facing difficulties in controlling frequency or ACE (Area Control Error) during a Capacity/Energy Emergency.
5.1.1 Manual Load Shedding for Capacity Shortage and Frequency Control Each Balancing Authority should normally carry out the following unless an alternative plan is submitted for review by the NPCC Task Forces on Coordination of Operation...
AI summary This section outlines the requirement for Balancing Authorities to have a plan for manual load shedding across the entire system, unless operational constraints limit shedding to a specific part of the system. The plan must be reviewed and approved by NPCC Task Forces and the Reliability Coordinating Committee.
5.1.2 Frequency Deviation When a large frequency excursion occurs during normal operations, Balancing Authority areas connected synchronously to the Eastern Interconnection shall continue to operate in the tie line bias area control mode u...
AI summary The text discusses the operational procedures for Balancing Authority areas during large frequency excursions, specifying that they should continue in tie line bias area control mode unless it adversely affects reliability.
5.1.3 Suspension of Tie Line Bias Area Control Mode Balancing Authority areas connected synchronously to the Eastern Interconnection should continue to operate in the tie line bias area control mode unless reliability concerns such as, but...
AI summary The document outlines conditions under which the Tie Line Bias Area Control Mode should be suspended, including loss of synchronism, uncertainty about connection status, suspect ACE values, and potential reliability issues.
5.1.5 Sustained Negative Area Control Error (ACE) Causing A Burden If a Balancing Authority area has a negative ACE that cannot be returned to zero within fifteen minutes with regulation resources presently available and other planned ener...
AI summary This section outlines the procedures for addressing a sustained negative Area Control Error (ACE) that causes a burden on the power system. If a Balancing Authority cannot resolve the negative ACE within 15 minutes, it must implement load shedding and notify other Balancing Authorities and the NPCC, while also issuing the appropriate NERC Energy Emergency Alert.
6.0 Generation Tripping at Low Frequency During a declining frequency event in a Balancing Authority area, generators may trip by underfrequency trip protection. This may aggravate the already declining frequency, possibly leading to a col...
AI summary During a declining frequency event, generators may trip due to underfrequency protection, potentially worsening the frequency decline and risking a system collapse. Load shedding may be required to compensate for the lost generation and stabilize the frequency.
6.1 Generator Tripping at Frequency below the Curve in NERC PRC-006-NPCC Figure 2 If the frequency decays below the curve shown in NERC PRC-006-NPCC Figure 2, steps may be taken to protect generating equipment, including separation from th...
AI summary This section discusses generator tripping at frequencies below the curve in NERC PRC-006-NPCC Figure 2. It outlines measures such as isolating generators and manual load shedding to protect equipment and address low frequency issues lasting over 300 seconds.
- 1.1 Title: Emergency Operations - 1.2 Directory Number: 2 - 1.3 Objective: The purpose of this Directory is to present the basic factors to be considered in formulating plans and procedures to be followed in an emergency or during condit...
AI summary This document outlines the Emergency Operations Directory, aimed at establishing plans and procedures to manage emergency situations and prevent service interruptions, system disturbances, and public hazards. It was developed based on NPCC criteria and applies to Reliability Coordinators, Balancing Authorities, and Transmission Operators.
Requirements - R1. The Transmission Operator, Balancing Authority and Reliability Coordinator shall observe normal transfer capabilities unless there is actual or forecasted insufficient capacity or voltage support in a Balancing Authority...
AI summary This section outlines requirements for transmission operators, balancing authorities, and reliability coordinators regarding transfer capabilities and load shedding procedures. It specifies that normal transfer capabilities should be used unless emergency conditions arise, and that manual load shedding plans must be reviewed and approved annually to ensure they can be executed quickly and without disrupting bulk power system elements.
Appendix A – NERC ERO Reliability Standards Requirements: The NERC ERO Reliability Standards containing requirements associated with this Directory, but not necessarily enforceable in all NPCC areas include, but may not be limited to: - BA...
AI summary This appendix lists NERC ERO Reliability Standards that apply to the NPCC region, including requirements related to disturbance control, frequency response, transmission operations, and emergency operations.
1.0 Introduction This Appendix provides the guidelines and procedures for anticipating and operating under emergency conditions. These guidelines and procedures are intended to provide specific instructions to the System Operator during su...
AI summary This section outlines guidelines and procedures for the System Operator to manage and respond to emergency conditions within NPCC Balancing Authority, Transmission Operator, or Reliability Coordinator areas, aiming to minimize impacts and prevent the escalation of emergencies.
2.0 Minimizing the Impact of Events - 2.1 It is recognized that provisions are made in the design of a power system for the satisfactory performance of the system during certain faults or incidents of equipment failure. It is also recogniz...
AI summary This section outlines the importance of planning for system faults and contingencies, ensuring adequate operating reserves, automatic generation control, and voltage stability within normal limits. It also describes abnormal voltage conditions and the procedures to follow when they occur, emphasizing adherence to NPCC and emergency criteria.
5.1.2 Frequency Deviation When a large frequency excursion occurs during normal operations, Balancing Authority areas connected synchronously to the Eastern Interconnection shall continue to operate in the tie line bias area control mode u...
AI summary This section outlines the procedures for managing frequency deviation and area control error (ACE) in the Eastern Interconnection. It specifies conditions under which the tie line bias area control mode should be suspended and alternative strategies implemented, including load shedding in cases of sustained negative ACE.
6.0 Generation Tripping at Low Frequency During a declining frequency event in a Balancing Authority area, generators may trip by underfrequency trip protection. This may aggravate the already declining frequency, possibly leading to a col...
AI summary During declining frequency events, generators may trip due to underfrequency protection, potentially worsening the frequency decline. Load shedding may be necessary to compensate for lost generation and prevent system collapse. Manual load shedding may be required if frequency remains low for extended periods.