CI Number: C0083451 Title: Seton Ridge Underground Network Start Date: 2026/08 In-Service Date: 2026/08 Final Cost Date: 2028/06 Function: Distribution Forecast Amount: $3,656,609
AI summary The document outlines the Seton Ridge Underground Network project, detailing its start and in-service dates, final cost date, function as a distribution network, and a forecasted cost of $3,656,609.
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 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.
as projects with a primary purpose that is integral to the effective operation of a system. These collective capabilities provide a service that is made up of nodes and vectors into a grid or system." Using this definition, power transmiss...
AI summary The text defines power transmission projects as system vectors connecting substation nodes, emphasizing challenges in routing, right-of-way, and stakeholder coordination. It notes that while transmission (high-voltage, long-distance) differs from distribution (lower-voltage, short-distance), both share similar estimation principles under the RP framework.
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.
4.6 Voltage and Current Distortion NS Power has adopted "IEEE 519 – 2014 IEEE Recommended Practices and Requirements for Harmonic Control in Electrical Power Systems". This establishes harmonic distortion limits for the Distribution System...
AI summary NS Power has implemented IEEE 519 – 2014 standards to establish harmonic distortion limits on the Distribution System, defining acceptable voltage distortion levels for electrical power systems.
5.3 Circuit Voltage The Cymdist models of the distribution feeder circuits at 23H-Rockingham and SL were modified to include the circuit upgrades and/or modifications needed to supply power to the Seton Ridge development and Willett Street...
AI summary The text discusses modifications to distribution feeder circuits at 23H-Rockingham and SL to support new developments and load conversions, including load flow analysis and voltage profiles before and after changes. The study evaluates the impact of a 12 MW load from the Seton Ridge Development.
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.
8.0 ANALYSIS This report offers a multistage solution to accommodate the two large loads using 12.5 and 25 kV circuits as well as steps to facilitate ongoing conversion to 25 kV. The first phase of the Seton Ridge development will be suppl...
AI summary The report outlines a phased approach to supply the Seton Ridge development using 12.5 kV and 25 kV circuits, with initial stages relying on existing infrastructure. Upgrades to NSPI's distribution system are classified as Network Upgrades, for which NSPI assumes full cost responsibility. The analysis includes a 12 MW load impact study and contingency planning for Rockingham Conversions.
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.
NON-CONFIDENTIAL 1 Request IR-1: 11 base. 12 13 (i) If not confirmed, please explain. 14 15 Response IR-2: 16 17 (a) The civil works associated with the underground distribution infrastructure are being 18 performed and funded by the devel...
AI summary NS Power clarifies that civil works for underground distribution infrastructure are funded by the developer, not included in their project scope. They also note that the conversion to 25 kV will depend on development uptake, load growth, and the broader Rockingham area conversion strategy, with no specific date identified.
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.
Request IR-8: - Please provide a circuit GIS map to indicate the proposed underground system primary and - secondary circuits. - Response IR-8: - Please refer to the figure below for a map of the proposed Seton Ridge distribution system.
AI summary A request for a circuit GIS map of the proposed underground system primary and secondary circuits is made, and a response directs the requester to a figure showing the proposed Seton Ridge distribution system map.
1 Request IR-9: 2 3 (a) Please explain the voltage and capacity of proposed underground section whether it 4 will be built only to meet the voltage and capacity requirements of the 12.5 kV system, 5 or whether it will be built to accommoda...
AI summary The response to Request IR-9 explains that the proposed underground distribution system will initially operate at 12.5 kV to meet current needs but is designed to accommodate a future transition to 25 kV. The system includes infrastructure to support future expansion, such as a 3x3 ductbank configuration with spare duct capacity.
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 existing underground systems with the lowest cost supply option. If overhead supply is the best option and the customer prefers underground service, they must cover the cost difference. NS Power maintains distribution facilities according to standard practices.
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: 12 (ii) For Seton Ridge Development, if an overhead system were to be constructed 13 instead of an underground system, please explain the respective scope of work 14 and cost responsibil...
AI summary The text discusses a request and response regarding the construction of an overhead system versus an underground system for the Seton Ridge Development, outlining the scope of work and cost responsibilities of NS Power and the developer, referencing relevant regulations.
M12900 – Nova Scotia Power Incorporated – CI C0083451 – Seton Ridge Underground Network – $3,656,609 (U&U) On June 11, 2026, Nova Scotia Power Incorporated (NS Power) applied to the Nova Scotia Energy Board (Board) for approval of an Unfor...
AI summary Nova Scotia Power Incorporated (NS Power) applied for approval of an underground electrical distribution project in Seton Ridge, costing $3,656,609. The project involves installing 1,750 metres of underground infrastructure to serve a new development. The Board approved the project, citing operational advantages of underground systems, including reliability, safety, and scalability for future load.
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-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.
Request IR-18: developer. Pdf pg. 39, Attachment 1, 8.0 Analysis, NS Power stated: The upgrades and modifications to NSPI's Distribution System as recommended in this report are considered Network Upgrades. As outlined in Section 7, NSPI i...
AI summary NS Power is being asked whether the proposed underground conversion project is considered a network upgrade and if they are responsible for all associated costs or if some should be recovered from the developer or HRM.
M12900 – Nova Scotia Power Incorporated – CI C0083451 – Seton Ridge Underground Network – $3,656,609 (U&U) On June 11, 2026, Nova Scotia Power Incorporated (NS Power) applied to the Nova Scotia Energy Board (Board) for approval of an Unfor...
AI summary Nova Scotia Power Incorporated (NS Power) applied for approval of an underground electrical distribution project in Seton Ridge, costing $3,656,609. The project is required due to the constrained urban development layout and limited corridor space. The Board approved the project, citing operational advantages of underground systems over overhead systems in terms of reliability, public safety, and scalability.
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