N-1CI C0083451 - Seton Ridge Underground Network - Report - Redacted
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DESCRIPTION: This project involves the installation of approximately 1,750 meters of fully underground distribution infrastructure to serve a high-density, mixed-use residential and commercial development in the Seton Ridge area of Halifax...
AI summary The project involves installing 1,750 meters of underground distribution infrastructure to support a high-density development in Halifax's Seton Ridge area. It addresses immediate and future load growth, with a planned voltage upgrade from 12.5 kV to 25 kV. The developer will handle civil work, enabling cost-efficient implementation and avoiding future disruptions.
Summary of Related CIs +/- 2 years: Pursuant to Section 11.2 of the CEJC, related CIs for Distribution projects include "work completed on the same asset class (Padmount transformers, Breakers, etc.) or in the same location (feeder, Transm...
AI summary The document outlines criteria for related Capital Investments (CIs) under Section 11.2 of the CEJC, focusing on distribution projects (e.g., transformers, breakers) and their depreciation classes. No projects are planned from 2024 to 2028, with assets estimated to last 50 years. Justification criteria emphasize the distribution system's 'requirement to serve' as a sub-criterion.
Why do this project? The Seton Ridge development will include 2,800 multi-unit and 164 single-family dwellings and associated commercial space, with approximately 25% of customers requiring 400A service. The resulting load demand is foreca...
AI summary The Seton Ridge development requires 12 MVA load capacity, exceeding existing infrastructure. NS Power proposes an underground ductbank installation to support growth, enhance reliability, and align with long-term 12.5 kV to 25 kV conversion plans, reducing outages and enabling future feeder expansion.
Why do this project now? Completing this work concurrently with the developer completing all civil work (including trenching, ductbank installation, and restoration) as part of their development scope presents a time-sensitive opportunity...
AI summary The project aims to install underground infrastructure concurrently with civil work to avoid higher future costs and disruptions. Early installation ensures a reliable distribution network for future load growth, while deferral would require a standalone project with increased expenses. The project is deemed in-service by August 2026, with the Final Cost Date set for June 2028.
Why do this project this way? An underground distribution solution represents the most practical and cost-effective long-term approach for the Seton Ridge area, supporting both current capacity requirements and future system expansion. The...
AI summary An underground distribution solution is proposed for Seton Ridge due to urban design constraints making overhead lines unfeasible. The 3x3 ductbank design accommodates current and future load growth, supports a 25 kV upgrade, and aligns with prudent utility planning to minimize long-term costs and service disruptions.
Document No: XXX-XX-XXXX-XXXX Project Cost Estimate Classifi Transmission Line Infrastructure Required fields: nate Classifi Project Name: Seton Ridge UG Network Started or Preliminary Class 5 Class 4 Class 3 Class 2 Class Maturity Level o...
AI summary This document outlines the project cost estimate and various deliverables for the Seton Ridge UG Network transmission line infrastructure project. The project's scope, capacity, location, requirements, technology selection, strategy, planning, and regulatory aspects are detailed, with a focus on defined deliverables and project maturity.
Inclusions For the purposes of this document, the term power transmission line infrastructure industries is assumed to include greenfield or brownfield sites for overhead, buried and submarine transmission of electrical power in the infras...
AI summary The document defines 'power transmission line infrastructure industries' to include overhead, buried, and submarine transmission projects, excluding distribution within facilities or generation. It references the Construction Industry Institute's infrastructure definition and cites related RPs like 18R-97 for excluded scopes.
EXECUTIVE SUMMARY This report presents the results of a Load Impact Study (LIS) for the 12 MW Seton Ridge residential/commercial development located in the Rockingham area of Halifax, Nova scotia. A second project located in close proximit...
AI summary This Load Impact Study assesses the electrical infrastructure needs for two Halifax developments (Seton Ridge and Willett Street Towers). The Rockingham area's 12.5 kV system requires upgrades to accommodate new loads, with a multistage solution proposed. NSPI will only proceed with network upgrades after customer plans are submitted to the Electrical Inspection Authority, emphasizing materiality studies and coordination with Metro Regional Engineering.
1.0 SCOPE This study was initiated by Southwest Properties to investigate solutions to accommodate a proposed 20 MW (Connected Capacity) residential and commercial complex centered around Seton Rd., Halifax. The demand requirement for the...
AI summary This study, initiated by Southwest Properties and Willett Street Towers, examines infrastructure capacity to support new developments in Halifax. It addresses a 12 MW residential/commercial complex and a 1.5 MW load request, while evaluating upgrades to 25 kV distribution circuits and substation/transmission capacity.
2.2 Distribution The distribution system being investigated in this report includes the 12.5 kV feeders supplied by 23H Rockingham as identified in Table 2. 23H contains one 69-12.5 kV transformer that supplies the local distribution load,...
AI summary The distribution system in Rockingham, Nova Scotia, is being evaluated for upgrades, including converting 12.5 kV circuits to 25 kV to enhance reliability. The study outlines load projections for new developments (Seton Ridge and Willett Street) and assumptions about infrastructure capacity and power quality.
5.0 SYSTEM CONDITIONS REDACTED CI C0083451 Attachment 1 Page 17 of 42 Seton Ridge Development – 12 MW Load Impact Study
AI summary The document references a 'Seton Ridge Development – 12 MW Load Impact Study' as part of the system conditions analysis, though no detailed findings or arguments are provided in the excerpt. The study likely evaluates the project's effects on grid capacity and reliability.
6.0 PROPOSED SOLUTIONS In order to provide the required circuit capacity, while avoiding circuit and transformer overload and voltage criteria violations, a multistage solution with steps contingent on surrounding developments is proposed....
AI summary The proposed multistage solution addresses circuit capacity needs by requiring dual-rated transformers for 12.5kV to 25kV conversion and contingent steps based on developments. Line extensions require HRM approval and customer easements, with a referenced 12 MW load impact study for Seton Ridge Development.
9.0 CONCLUSIONS This report presents the results of a Load Impact Study (LIS) for the 12 MW Seton Ridge residential/commercial development located in the Rockingham area of Halifax, Nova scotia. A second project located in close proximity...
AI summary The Load Impact Study for the 12 MW Seton Ridge and 1.5 MW Willett Street Towers developments highlights infrastructure limitations in the Rockingham area, requiring multistage upgrades to accommodate both projects and ongoing voltage conversion. NSPI will not proceed with network upgrades until customer plans are submitted to the Electrical Inspection Authority, with material load changes necessitating revised studies.
N-2NSPI (NSEB) RIRs 1-18
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NON-CONFIDENTIAL 1 Request IR-1: 2 3 Pdf pg. 3 of the application states: 4 5 6 7 8 9 The system is designed to meet both the immediate service requirements of this development and the anticipated long-term load growth, with provisions for...
AI summary The response to Request IR-1 describes the future provisions incorporated into the project, including the construction of a standard NS Power 3x3 underground ductbank system with spare duct capacity to support future load growth and adjacent developing areas such as Suzie Lake and Bedford. The response also notes that the ductbank infrastructure will become part of NS Power's distribution system after construction.
3 1 Request IR-5: 3 (a) Please explain and quantify the expected benefits of the proposed underground 4 system compared with the overhead alternative, including but not limited to: 5 6 (i) Reliability; 7 (ii) Safety; 8 (iii) Operation cost...
AI summary The response discusses the reliability, safety, and operation costs of an underground distribution system compared to an overhead system. It notes that underground systems experience fewer outages due to environmental factors but may have longer restoration times when outages occur.
1 Request IR-9: 1 As identified in the Seton Ridge Load Impact Study, the development is expected to reach 2 an ultimate load of approximately 12 MVA, with the initial portion of the load supplied 3 from the existing 12.5 kV system and fut...
AI summary The document discusses the proposed underground infrastructure to support both current and future electrical load requirements in the Rockingham area, including the installation of a 3x3 ductbank configuration as part of NS Power's standard design. The infrastructure is initially operating at 12.5 kV but is designed to support future 25 kV voltage and capacity needs.
Replacement of Existing Systems - The Company will be responsible for costs associated with the best (generally lowest cost) supply option should an 1 2 3 4 5 6 7 underground system (or any part thereof) have to be replaced. Where this opt...
AI summary The Company is responsible for replacing underground systems with the lowest cost option, which may be overhead supply. If a customer prefers underground service, they must cover the additional cost difference. A planning-level estimate was prepared for an overhead alternative, including approximately 1,750 m of three-phase and 1,350 m of single-phase overhead infrastructure.
1 (e) The Load Impact Study was prepared to assess the impact of the forecast Seton Ridge load 2 on NS Power's distribution system and identify the system upgrades necessary to 3 accommodate future load growth and support the planned trans...
AI summary The Load Impact Study assessed the impact of the forecast Seton Ridge load on NS Power's distribution system and identified necessary system upgrades. It focused on system requirements and long-term planning rather than specific design details. The study did not recommend underground construction but supported the proposed underground infrastructure to align with long-term planning objectives.
performance in each of these years. 1 Request IR-16: 2 3 Pdf pg. 15, Attachment 1, stated that the Suzie Lake (SL) substation was scheduled to be 4 completed in 2023 and would provide offload for several stations, including conversion of 5...
AI summary The text discusses the status of the Susie Lake substation construction, which has been delayed due to challenges in securing a suitable site, with the current in-service date now expected in 2028. Load transfers were not completed as planned, but some conversion work elsewhere has mitigated load growth impacts on the 23H-Rockingham station.
102523NSEB (NSPI) IR 1 to 18
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Request IR-1: - Pdf pg. 3 of the application states: "The system is designed to meet both the immediate service - requirements of this development and the anticipated long-term load growth, with provisions for - future expansion as appropr...
AI summary The document requests detailed information on future provisions and incremental costs for a project designed to meet immediate and long-term load growth, including support for adjacent areas such as Suzie Lake and Bedford.
Request IR-9: a) Please explain the voltage and capacity of proposed underground section whether it will be built only to meet the voltage and capacity requirements of the 12.5 kV system, or whether it will be built to accommodate future 2...
AI summary Request IR-9 seeks clarification on the voltage and capacity of a proposed underground distribution system, whether it will be built for current 12.5 kV requirements or future 25 kV needs, and requests cost estimates for converting both underground and overhead systems to 25 kV.
Request IR-11: - Pdf pg. 4 of the application states: "To support this level of growth and ensure reliable long-term service, the proposed underground installation provides a scalable and resilient solution. It enables future feeder expans...
AI summary The document requests an explanation of why an overhead system cannot provide the same scalability and resilience as an underground installation for future load growth in areas like Suzie Lake, Bedford, and Lacewood.
- roads, sidewalks, multi-use paths, and tight building sitings and setbacks. These urban design requirements significantly restrict where a permanent overhead line could be placed. As a result of these constraints, a scalable overhead con...
AI summary The text outlines concerns about the feasibility of overhead power lines due to urban design constraints in Seton Ridge, necessitating underground infrastructure. It requests detailed analysis, consultation processes, and alternative service options from NS Power and HRM.
Request IR-16: - Pdf pg. 15, Attachment 1, stated that the Suzie Lake (SL) substation was scheduled to be completed in 2023 and would provide offload for several stations, including conversion of the 23H-Rockingham 12.5 kV load. - a) Pleas...
AI summary The text requests information about the status of the Suzie Lake substation construction, load transfer, and the conversion of 12.5 kV to 25 kV, including whether this conversion is preplanned and whether it involves the entire 23H substation or only selected feeders.