N-110 Year System Outlook 2010-2010 Report dated June 30, 2010 6/30/2010
40 passages
1.0 INTRODUCTION Nova Scotia Power Inc.'s (NSPI, the Company) filing of June 30, 2008 provided the initial 10 Year System Outlook. Following NSPI's second annual 10 Year System Outlook filing on June 30, 2009, the Nova Scotia Utility and R...
AI summary NSPI's 2010 Outlook, informed by the 2009 IRP Update, outlines load forecasts, DSM program updates, generation expansion, transmission planning, and capital projects. The Board anticipates incorporating recommendations from briefings into the Outlook, aligning with Market Rule requirements and transmission planning needs.
3.0 DEMAND SIDE MANAGEMENT FORECAST The table below summarizes annual projected demand and energy savings included in the Load Forecast in Section 2.0. The trajectory is consistent with the DSM profile from the 2009 IRP Update adjusted for...
AI summary This section provides an overview of the demand side management forecast, summarizing annual projected demand and energy savings from the Load Forecast in Section 2.0. The trajectory aligns with the DSM profile from the 2009 IRP Update, adjusted for early year changes.
4.2 Changes in Capacity Table 5 provides the firm Supply and Demand Side Management capacity additions per the Port Hawkesbury (PH) Biomass Project Base Case Plan (as filed with UARB in P-128.10 April 9, 2010) over the 2010-2020 time perio...
AI summary The section discusses changes in capacity, referencing the Port Hawkesbury Biomass Project and its inclusion in the Base Case Plan. It notes the unavailability of the Burnside unit #4 and the assumptions used for wind capacity based on historical and forecasted data.
Table 6 – Generation Interconnection Queue Queue Order IR# Request Date DD-MMM-YY County MW Summer MW Winter Interconnection Point Requested Туре Inservice date DD-MMM-YY Status Service Type Studies Available 12 117 13-Apr-07 Shelburne 10...
AI summary Table 6 outlines the generation interconnection queue with details on various projects, including their request dates, capacities, interconnection points, statuses, and service types. The data shows a mix of wind, water, steam, and biomass projects at different stages of study completion.
5.3 Province's Wind Integration Study The 2008, Hatch Ltd. Wind Integration Study identified and assessed the effects of integrating large scale wind power generation into Nova Scotia's electric power system. This study confirmed that "mor...
AI summary The 2008 Hatch Ltd. Wind Integration Study highlighted the need for detailed impact studies on transmission upgrades and operational demands from wind power integration. NSPI now monitors variable energy sources like wind to improve forecasting and ensure system stability and availability.
5.4 Other Opportunities In addition to the above, potential developments outside of Nova Scotia (e.g. Lower Churchill and Point Lepreau II), if implemented, would influence the Company's longterm resource plan in general and transmission s...
AI summary The section highlights potential external developments, such as Lower Churchill and Point Lepreau II projects, which could influence Nova Scotia Power's long-term resource plan and transmission system. These opportunities are being monitored, with a reference to a 2008 wind integration study.
6.0 RESOURCE ADEQUACY
AI summary The section titled '6.0 RESOURCE ADEQUACY' introduces a regulatory proceeding topic focusing on ensuring sufficient energy resources to meet demand, though no detailed content or arguments are provided in the excerpt.
6.1 Operating Reserve Criteria As a member of the Maritimes Area of the Northeast Power Coordinating Council (NPCC), NSPI meets the operating reserve requirements as outlined in NPCC Document A-6, Operating Reserve Criteria . This criteria...
AI summary NSPI adheres to NPCC's operating reserve criteria, sharing ten-minute reserves with NBSO via a load-ratio share and maintaining 171 MW of ten-minute reserves. It anticipates increased regulating reserves due to wind generation and conducts biannual 18-month resource adequacy assessments. The Interconnection Agreement outlines shared reserve responsibilities.
6.2 Planning Reserve Criteria NSPI is required to comply with the NPCC reliability criteria. These criteria are outlined in NPCC Reliability Reference Directory #1 – Design and Operation of the Bulk Power System 5 and states that: The prob...
AI summary NSPI must meet NPCC reliability criteria by maintaining a 20% planning reserve margin and ensuring a loss of load expectation (LOLE) of no more than 0.1 day/year. The New Brunswick System Operator (NBSO) confirms this margin, along with 50 MW interconnection assistance, satisfies NPCC standards through annual and triennial reviews.
6.3 Load and Resources Review The ten year load forecast and resources additions in Table 8 below are based on the capacity additions and DSM forecast in Table 5. Table 8 indicates that a planning reserve margin equal to 20 percent of the...
AI summary This section discusses the ten-year load forecast and resources additions, referencing Table 8, which indicates that a planning reserve margin of 20 percent of the firm peak load is maintained.
7.1 System Description The existing transmission system has over 5,200 kilometres of transmission lines at voltages at the 69 kV, 138 kV, 230 kV and 345 kV levels. - The 345 kV transmission system is approximately 468 kilometres in length...
AI summary The document details Nova Scotia's transmission system, including 5,200 km of lines at various voltage levels (69 kV to 345 kV), their construction materials, and interconnections with New Brunswick, Quebec, and Maine via the NPCC power system.
7.2 Transmission Design Criteria NSPI, consistent with good utility practice, utilizes a set of deterministic criteria for its interconnected transmission system that combines protection performance specifications with system dynamics and...
AI summary NSPI employs deterministic criteria for transmission system design, ensuring reliability through single contingency standards and Special Protection Systems (SPS). It adheres to NPCC guidelines for interconnected systems and leverages SPS within SCADA to manage stability and prevent overloads.
The table below lists the lines within the NSPI transmission system which have undergone maintenance over the past two years along with proposed planned maintenance for 2010: 2008 2009 2010 L5003 (Farrell StSackville) L5003(Farrell StSackv...
AI summary The table lists lines within the NSPI transmission system that have undergone maintenance over the past two years and outlines proposed planned maintenance for 2010, including line identifiers and locations.
The transmission plan presented in this document provides a summary of the planned reinforcement of the NSPI power system. The proposed investments are required to maintain system reliability and security and comply with System Design Crit...
AI summary This document outlines NSPI's transmission plan, which includes upgrades to maintain system reliability and comply with design criteria. Projects are subject to further studies and approval by the UARB. A Technical Planning Committee was established in 2008 to assess resource adequacy and transmission reliability, including inter-tie upgrades between Nova Scotia and New Brunswick.
7.5 NSPI/NB Interconnection Overview The power systems of Nova Scotia and New Brunswick are interconnected via three overhead transmission lines; one 345kV line from Onslow, Nova Scotia to Memramcook, New Brunswick, and two 138kV lines fro...
AI summary Nova Scotia and New Brunswick's power systems are interconnected via three transmission lines, with the 345kV line carrying 80% of total power. The interconnection ensures system reliability, with import/export limits set at 350MW export and 300MW import to manage single contingency losses. Flow on 138kV lines is influenced by regional loads.
NSPI Capital Item CI# 29009 Right of Way Purchase Northern NS In jurisdictions across North America it is becoming more difficult to obtain access to the land and the rights of way necessary to undertake transmission projects. It is estima...
AI summary NSPI plans a second 345kV transmission line to New Brunswick, citing challenges in securing right-of-way access and estimating a $200M cost with a 5-year timeline. The project, part of the 2010 ACE Plan, requires regulatory approval by June 2010 to address evolving electricity market needs.
1. 2010 - Work will begin on the construction of additional transmission to the Western Valley area. This will include the construction of a 138 kV circuit between Canaan Road and Tremont, a 138 kV termination at Canaan Road and the additi...
AI summary The 2010 document outlines transmission infrastructure upgrades, including new 138 kV circuits, transformer installations, and reliability improvements. Projects aim to prevent outages, replace aging equipment, and integrate renewable energy sources like wind farms. Key initiatives include insulator replacement, switchgear upgrades, and grid expansions to enhance system reliability and accommodate renewable generation.
2. 2011 - The insulator replacement program will continue with the reinsulation of three circuits due to cement growth issues. - The transmission reliability investment program will continue targeting transmission switches and circuit brea...
AI summary The 2011 document outlines ongoing infrastructure projects including insulator replacement, transmission reliability investments, and upgrades to 138 kV and 69 kV circuits. Key initiatives involve dual high-speed protection systems at 138 kV substations, Gas Insulated Switchgear replacement, and reconductoring to avoid overloads. A second 345 kV tie to New Brunswick is also planned.
7. 2018 - An existing 69-25 kV transformer at Milton will be changed out for a unit rated 15/20/25 MVA. - There is a possibility of an additional supply to the Halifax downtown area. This could take the form of a 138 kV underwater cable fr...
AI summary In 2018, plans included replacing a 69-25 kV transformer at Milton with a higher-capacity unit and exploring new power supply options for Halifax, such as a 138 kV underwater cable from Dartmouth to Water St. Further evaluation of the latter option was slated to begin soon.
10.0 CONCLUSION It is likely that the NSPI transmission system will require reinforcement in the coming decade and that this reinforcement will occur across the province and at the provincial inter-tie. The specific form of this reinforcem...
AI summary NSPI anticipates needing transmission system reinforcement across the province and at the provincial inter-tie within the next decade. NSPI will apply to the UARB for approval of a second inter-tie and seek stakeholder collaboration to develop a transmission expansion plan. The process requires regulatory support and ongoing stakeholder engagement.
11.0 REFERENCES - 1. 2004 Maritimes Area Triennial Review of Resource Adequacy , Report approved by NPCC Reliability Coordinating Council March 9, 2005. - 2. Basic Criteria for Design and Operation of Interconnected Power Systems , Northea...
AI summary The references section cites key documents and regulations related to Nova Scotia's energy sector, including wind integration studies, integrated resource plans, wholesale market rules, and renewable energy standards. These materials support technical and regulatory analyses in the proceeding.
SYSTEM DESIGN CRITERIA Nova Scotia Power's interconnected system is divided into several classifications, each of which is governed by different design criteria. These classifications are as follows: - 1. Primary Transmission - 2. Secondar...
AI summary Nova Scotia Power's system is categorized into five classifications (Primary Transmission, Secondary Transmission, etc.), each governed by specific design criteria combining protection performance, system dynamics, and steady-state requirements. Protection design assumes a single coincident protection element failure.
NOTES: - 1. No expenditure may be made to reduce clearing times to reference values without authorization from System Design. - 2. Permissive tripping between an electrically remote bus and a transmission bus (or between 2 electrically rem...
AI summary The notes outline system design criteria for power operations, including expenditure authorization requirements for reducing clearing times, permissive tripping exemptions, and acceptance of designed load loss scenarios during remote system element failures. These rules emphasize operational flexibility and reliability.
The Design Criteria are: - 1. Sub transmission system loading shall be within the thermally limited ratings. - 2. The sub transmission system voltages shall not be less than 97.5 percent or greater than 105 percent of nominal. - 3. As far...
AI summary The design criteria outline technical standards for sub-transmission systems, including thermal limits, voltage ranges (97.5%-105% nominal), fault management, and contingency planning. It emphasizes voltage stability post-fault, backup solutions for transformer outages, and limitations on voltage changes during system disruptions.
Design Criteria - 1. Capacity for any individual transformation point shall, under nominal system conditions, be sufficient to meet the daily load requirements after due consideration is given to the following: - a) Economic dispatch or ou...
AI summary The design criteria outline requirements for system capacity and reinforcement to ensure reliability under normal and contingency conditions. Capacity must meet daily load demands considering economic dispatch and transformer loading, while reinforcement is mandated to prevent thermal damage or load unmet during single contingencies, factoring interconnections, generation, and transformer capacities.
NOTES : - 1. Reinforcement may be the economic choice even if (a), (b) and (c) or (d) result in satisfaction of the load supply criteria because estimated out-of-merit costs may significantly exceed the costs of capital advancement. - 2. T...
AI summary The notes discuss scenarios where reinforcement may be economically preferable despite meeting load supply criteria, potential need for additional transmission transformation due to system contingencies, and the possibility that criteria application may not result in new installations. Key considerations include out-of-merit costs, system reliability risks, and capital advancement trade-offs.
TRANSMISSION ADDITIONS FOR GENERATION DEVELOPMENT SCENARIOS Distributed large-scale renewable generation, large-scale imports and exports and new inprovince thermal generation all have a potential role in serving Nova Scotia's future elect...
AI summary Nova Scotia's transmission system may require reinforcement to accommodate future renewable generation, imports/exports, and in-province thermal generation. NSPI's preliminary scenarios highlight transmission constraints and potential investments, though the information remains conceptual. These scenarios aim to inform long-term expansion planning to enable higher renewable energy integration, which NSPI supports.
a) Mainland (Metro) wind generation (100MW-150MW) development scenario Establish a new 138kV substation in the Dartmouth area along with rebuilding/reconductoring two existing circuits and building a new 138 kV circuit between Fall River a...
AI summary The proposed 100MW-150MW Mainland wind generation scenario involves establishing a new 138kV substation in Dartmouth, rebuilding two existing circuits, and constructing a new 138kV circuit between Fall River and Sackville to support the development.
b) Mainland (South Nova) wind generation (100MW-150MW) development scenario Re-conductor an existing 138 kV circuit between Milton and Tusket along with an existing 69 kV circuit between Tremont and Michelin. A 138 kV substation would be e...
AI summary The scenario involves re-conducting existing 138 kV and 69 kV power lines between Milton-Tusket and Tremont-Michelin, establishing a new 138 kV substation in Tusket, modifying substations at Canaan Road, Milton, and Bridgewater, and separating two 230 kV circuits near Bridgewater to support a 100MW-150MW wind generation project.
c) Mainland (Lower Annapolis Valley) wind generation (100-150MW) development scenario This scenario requires the completion of a 138kV line L-6617 from Tremont to Canaan Rd currently scheduled for construction along with a new ring bus con...
AI summary The scenario outlines infrastructure upgrades required for a 100-150MW wind generation project in Lower Annapolis Valley, including 138kV line construction, ring bus configurations, substation modifications, and voltage upratings to support the development and integrate with existing transmission networks.
d) Mainland (Upper Annapolis Valley) wind generation (100-150MW) development scenario An existing 69 kV circuit between Sissiboo and Tusket would be rebuilt to a higher capacity. Substation modifications would be required at Canaan Road an...
AI summary The scenario outlines infrastructure upgrades for a 100-150MW wind generation project in Upper Annapolis Valley, including rebuilding a 69kV circuit, substation modifications at Canaan Road and Milton, replacing autotransformers, and separating 230kV circuits near Bridgewater to accommodate increased capacity.
e) Mainland (Northern Nova Scotia) wind generation (100-150MW) development scenario Construct a new 138kV line from Onslow to Springhill and install a 100 MVAR static compensator on the Onslow 230 kV bus along with increasing reactive powe...
AI summary The proposed 100-150MW wind generation project in Northern Nova Scotia requires infrastructure upgrades: a new 138kV line from Onslow to Springhill, a 100 MVAR static compensator at Onslow, enhanced reactive power compensation at Brushy Hill, and uprating an existing 230kV circuit to 345kV for transmission between Onslow and Brushy Hill.
f) Cape Breton Wind generation (150MW -250MW) development scenario An existing 230 kV circuit would be uprated to 345 kV to provide a 345 kV transmission connection between Onslow and Brushy Hill and reactive power compensation would be in...
AI summary The Cape Breton Wind generation scenario outlines infrastructure upgrades including uprating a 230 kV circuit to 345 kV, establishing new 345 kV substations at Port Hastings and Spider Lake, constructing 345 kV transmission lines to Woodbine and Spider Lake, a new Canso crossing, and adding 100 MVAR reactive compensation in the Dartmouth area.
2) Port Hawkesbury 60MW Biomass- Cape Breton Strait Area Scenario An additional line crossing the Strait of Canso would be constructed to eliminate the double circuit contingency limit. A bus reconfiguration at NSPI's Onslow 345kV EHV subs...
AI summary The Port Hawkesbury 60MW Biomass project requires infrastructure upgrades including a new line across the Strait of Canso, bus reconfiguration at Onslow substation, 138kV line terminal upgrades at Trenton, and switched capacitors at Brushy Hill, all managed by NSPI.
Large External Imports (300MW) or Export development scenario
AI summary The scenario evaluates the implications of large-scale external energy imports (300MW) or export development on Nova Scotia's power system, focusing on infrastructure planning and integrated resource planning considerations.
a) To facilitate a large import or export via NB interconnect To enable import, a new 345 kV transmission circuit would be required between Onslow to the New Brunswick system. An existing 230 kV circuit would be uprated to 345 kV to provid...
AI summary The text outlines infrastructure upgrades required to enable large imports or exports via the NB interconnect, including new 345 kV transmission circuits, uprating existing lines, reactive compensation, and a ring bus. Joint planning studies with New Brunswick are needed to assess system upgrades for firm import/export capacity.
b) Newfoundland Submarine Cable Import (300MW) or Export development scenario A 300 MW DC to AC terminal would be required at Onslow or Brushy Hill along with a DC submarine cable from Newfoundland to Cape Breton along with overhead DC tra...
AI summary A 300 MW DC to AC terminal and submarine cable infrastructure from Newfoundland to Nova Scotia is proposed, requiring upgrades to 345 kV transmission lines and a new ring bus at Hopewell. Further study is needed for potential energy exports through Nova Scotia.
Large Natural Gas Generator (250MW – 350MW) expansion scenario For contingency loss of a large generator scenario the NS-NB inter-tie may require reinforcement depending on potential unit size.
AI summary The scenario discusses potential reinforcement of the NS-NB inter-tie to address contingency losses from a large natural gas generator (250MW–350MW), depending on the unit size.
a) Eastern Shore/Point Tupper Natural Gas Generator Scenario Substation expansions would take place at Point Tupper and Port Hastings including the addition of a 345/230 kV transformer at Port Hastings. A 345/138 kV substation would be est...
AI summary The Eastern Shore/Point Tupper scenario outlines required substation expansions and new transmission circuits to support a natural gas generator. Key infrastructure includes a 345/230 kV transformer at Port Hastings, a 345/138 kV substation at Spider Lake, and new 230 kV and 345 kV circuits connecting Point Tupper, Port Hastings, and Spider Lake.
b) Metro Large Natural Gas Generator Scenario Development of a 138 kV substation at Spider Lake to terminate two existing Dartmouth 138 kV circuits along with increasing the conductor size on two existing Dartmouth circuits. A new 138 kV c...
AI summary The Metro Large Natural Gas Generator Scenario outlines infrastructure upgrades including a new 138 kV substation at Spider Lake, conductor size increases on Dartmouth circuits, new 138 kV circuits to Sackville, and a high-capacity line between Tufts Cove and Brushy Hill, alongside substation modifications at Tufts Cove and Brushy Hill.