TABLE OF ABBREVIATIONS Abbreviation Description 10 YSO 10-Year System Outlook AAS Automatic Action Schemes BESS Battery Energy Storage System CER Clean Electricity Regulations CO2 Carbon Dioxide CPP Critical Peak Pricing DC Direct Current...
AI summary The document contains a table of abbreviations used in a Nova Scotia regulatory proceeding, including terms related to energy, environmental regulations, and infrastructure.
1 INTRODUCTION IESO Nova Scotia was established under the More Access to Energy Act as the province's independent system operator, responsible for resource planning, including resource adequacy assessments, transmission planning, and procu...
AI summary IESO Nova Scotia, established under the More Access to Energy Act, is responsible for resource planning and transmission planning. This document outlines the inaugural 10-Year System Outlook, with filing requirements for the Load Forecast and 10YSO reports, previously managed by NS Power and now under IESO Nova Scotia.
System Peak (MW) Net System Requirement (GWh) Year System Peak (MW) Growth (%) Nova Scotia Power Net System Requirement (GWh) Renewable -to Retail Energy (GWh) Municipa lity Energy (GWh) Behind-the Meter Solar (GWh) IESO-NS Net System Requ...
AI summary The table provides a projection of system peak demand and net system requirements for Nova Scotia from 2026 to 2036. It includes data on renewable energy, municipal energy, behind-the-meter solar, and the IESO-NS net system requirement. Footnotes reference a Wholesale Market Backup/Top-up Service Tariff, a letter from IESO NS to the NSEB, and a 2026 Load Forecast Report.
5.1 Transmission System Design Consistent with good practice, IESO Nova Scotia utilizes a set of deterministic criteria for its interconnected transmission system that combines protection performance specifications with system dynamics and...
AI summary IESO Nova Scotia employs deterministic criteria for its interconnected transmission system, ensuring adequacy and security after faults or disconnections. The system is classified under Nova Scotia System Design Criteria, which govern protection performance and system dynamics.
5.1.1 Interconnection Requirements IESO Nova Scotia sets performance and interconnection requirements for BESS, generation, and load connecting to the Nova Scotia transmission system. These performance and interconnection requirements will...
AI summary IESO Nova Scotia establishes interconnection requirements for BESS, generation, and load connecting to the transmission system. These requirements are being refined as technology advances and local experience grows. Inverter-based resources (IBRs) like solar and wind can be integrated, though they may require additional grid support mechanisms. The TSIR, last updated in February 2025, will be reviewed in 2026.
5.2.1 Generator and BESS Interconnection The Combined Transmission & Distribution (T&D) Advanced Stage Interconnection Request Queue[38](#page-23-1) provides the location and size of generating and BESS facilities seeking interconnection w...
AI summary The document outlines the status of generator and BESS interconnection requests in Nova Scotia, noting that 20 interconnection requests are associated with 18 projects expected to connect to the transmission system before 2030. These projects involve Transmission Provider's Interconnection Facilities (TPIF) and Network Upgrades (NU), though work related to these is not included in the report.
5.2.3 OATT Transmission Service Queue As of June 4, 2026 there are three requests in the Open Access Transmission Tariff (OATT) Transmission Queue. [39](#page-24-0) Information under project location reflects the non-confidential informati...
AI summary As of June 4, 2026, there are three requests in the OATT Transmission Service Queue. The locations of generating facilities and loads are considered confidential under Section 17.2 of the OATT and are not publicly available on OASIS.
5.3.1 Western Valley Transmission System The Western Valley transmission study was initiated to identify if load growth and new generation in the area necessitate system upgrades and/or protection scheme changes. System upgrades could incl...
AI summary The Western Valley transmission study was initiated to assess if load growth and new generation in the area require system upgrades or changes to protection schemes. Upgrades may include reactive power sources, while protection changes may involve Automatic Action Schemes (AAS) or Remedial Action Schemes (RAS). The study covers 2027 and 2032 for both normal and N-1 scenarios, with 2027 results identifying necessary upgrades.
5.4 Planned Projects The transmission plan presented in this section provides a summary of the planned reinforcement of the Nova Scotia transmission system. The proposed projects are required to maintain system reliability and security and...
AI summary This section outlines planned transmission system reinforcements in Nova Scotia to ensure reliability, security, and compliance with standards. Projects are based on system impact studies and may change due to technical studies, load forecasts, or other factors determined by IESO Nova Scotia.
5.4.1 Reliability Intertie On April 10, 2025, Wasoqonatl Transmission Incorporated (WTI) filed the NS-NB Reliability Intertie Project Application to build the reliability intertie, a second 345 kV AC transmission line between the Nova Scot...
AI summary On April 10, 2025, Wasoqonatl Transmission Incorporated (WTI) submitted an application for the NS-NB Reliability Intertie Project, which was approved by the NSEB on November 20, 2025. This project involves constructing a second 345 kV AC transmission line between Nova Scotia and New Brunswick to support renewable energy integration and meet provincial renewable energy mandates.
5.4.2 Synchronous Condensers In order to accommodate the generation identified in Sectio[n 5.2.1](#page-23-2) , new synchronous condenser installations are required to be added to the transmission system by 2030. At present, five condenser...
AI summary To accommodate identified generation, new synchronous condenser installations are required by 2030, with five units planned at specific locations. Each unit will need dedicated circuit breakers and substation terminals, and additional condensers may be needed for future wind projects.
5.4.3 Transmission Development Project List [Table 9](#page-26-0) below lists the transmission system development projects identified by IESO Nova Scotia which must be completed over the 10-Year System Outlook horizon.
AI summary The document outlines the transmission development projects identified by IESO Nova Scotia that must be completed over the 10-Year System Outlook horizon, as listed in Table 9.
Table 9: Transmission Project List 2026-2036 Project Type Location Year Status Project Description 2026 Line Upgrade L6531 2026 Planned L6531 Thermal Upgrade to 60 deg C 2027 Line Rebuild L6004 2027 Planned L6004 Thermal Upgrade (75 deg C...
AI summary Table 9 outlines a list of planned transmission projects in Nova Scotia from 2026 to 2036, including line upgrades, rebuilds, new capacitor banks, transformer replacements, and new lines. These projects aim to enhance grid reliability and capacity in response to load studies and future energy demands.
6 CONCLUSION This report constitutes IESO Nova Scotia's 10-Year System Outlook for the 2026-2036 horizon and satisfies the requirement under Section 3.3.1.3 of the Nova Scotia Wholesale and Renewable to Retail Electricity Market Rules . Th...
AI summary IESO Nova Scotia's 10-Year System Outlook (2026-2036) outlines the province's transition to 80% renewable energy and coal phase-out by 2030. The report highlights the need for successful implementation of projects to maintain system adequacy and meet decarbonization targets, while studying impacts of load and generation, including inverter-based resources, to ensure system reliability.
Disclaimer: These summaries were generated by AI from the filings they describe. We take care to make them accurate, but errors are possible - and they aren't advice. Only the filings themselves are the record: if you're relying on something here, confirm it against the source documents or the Nova Scotia Energy Board's own record. Full disclaimer →