Topic:"Infrastructure Planning" in M12694

Matter: Nova Scotia Power Inc. - Cold Weather Event, January 23-26, 2026

6 passages 3 documents

Infrastructure Planning across all matters →

N-1Report 3 passages

Distribution p. p. 5

Distribution - The team reviewed the work completed in response to the February 4, 2023 extreme cold weather - event and confirmed completion. Additionally, the Distribution Planning team used 2025 peak - load data as well as data from the...

AI summary The Distribution team reviewed actions taken after the February 4, 2023 extreme cold event and confirmed completion. Using 2025 peak load data, heavily loaded feeders at risk of tripping during extreme conditions were identified, and protective device settings were validated or updated. Restoration plans were prepared for areas prone to cold load pickup to streamline outage recovery.

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Transmission Line p. p. 5

Transmission Line - All transmission elements that were out of service due to planned maintenance were returned to - service in advance of the event. DATE FILED: March 6, 2026 Page 7 of 23

AI summary The text notes that all transmission elements out of service for planned maintenance were restored ahead of an event, ensuring reliability. Filed on March 6, 2026, page 7 of 23, it highlights proactive maintenance efforts.

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3.9 Lessons Learned from the February 3-5, 2023 Cold Weather Event NS Power completed post-event analysis and reporting after the February 2023 Cold Weather event. As a result of this analysis, actions were identified for follow up and were completed. Consequently, the NS Power system was better positioned to withstand extreme cold temperatures. Specifically, during the 2023 event rotating feeder outages were performed to alleviate overload conditions at seven (7) substations and on-off-on outages were experienced by 25 downline reclosers. During the 2026 event, under similar or higher loading conditions, overloading occurred at only one (1) substation and on-off-on outages were experienced by only one (1) downline recloser. The two issues that were identified in the 2023 event and also noted in the 2026 event were: • L-5545 transmission line protection limit was reached, which resulted in rotating feeder outages at 70W High Street (discussed in Section 3.7.1) • Downline recloser 512N-311 experienced multiple outages (discussed in Section 3.7.2) In both instances protection settings were reviewed and adjusted after the 2023 event. During the 2026 event, engineering resources reviewed the protection settings for these assets and were able to revise them during the event to resolve the issue. The long-term resolution to the L-5545 overloading issue is a proposed new substation which will offload the transmission line 4.0 CONCLUSION NS Power's Event Monitoring Team identified the potential impact of the forecasted extreme cold weather and engaged the Operation Coordination Team in advance of the event to ensure the power system was optimized to respond. System load reached a new record peak during the January 23- 26 cold weather event. During the event, the power system was operated in a safe, stable manner with no system-wide firm load shedding due to system generation capacity shortages. Engineering teams worked with operations to implement learnings from the February 2023 cold load event to minimize customer impact due to localized extreme feeder loading. The Company's key p. pp. 20-21

3.9 Lessons Learned from the February 3-5, 2023 Cold Weather Event NS Power completed post-event analysis and reporting after the February 2023 Cold Weather event. As a result of this analysis, actions were identified for follow up and wer...

AI summary NS Power conducted a post-event analysis following the February 2023 Cold Weather event, leading to system improvements. Actions taken after the event helped the system better withstand extreme cold. In 2023, rotating feeder outages occurred at seven substations, but in 2026, only one substation experienced overloading. Protection settings were reviewed and adjusted, and a new substation is proposed to resolve the L-5545 overloading issue.

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N-2NSPI (NSEB) RIR 1 to 17 2 passages

1 field, resolving the issue. This device was originally missing from the list of at-risk devices p. p. 10

1 field, resolving the issue. This device was originally missing from the list of at-risk devices 7 Link operating at 900 megawatts, please provide an estimate of the Maritime Link imports 8 that could be expected in the future events, ass...

AI summary The response discusses the Labrador Island Link (LIL) and its current operational capacity, noting that while increased flows are possible, they depend on factors like generation availability and market conditions. It also clarifies that increased LIL capacity would not affect NS Power's system reserves.

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Date: Sun January 25, 2026 p. p. 38

Date: Sun January 25, 2026 HOUR LOAD FORECAST RESERVE REQMT SYSTEM MARGIN PA1 LIN1 LIN2 LIN3 LIN4 TR5 TR6 PT2 TUC1 TUC2 TUC3 TUC6 CT TOTAL IPP TOTAL PT BIO HYDRO TOTAL BESS WIND TOTAL FIRM NB PURCH FIRM NFLD PURCH 12 383 2 2 7 4 4 23 15 3...

AI summary The document presents a detailed table with hourly load forecasts, reserve requirements, system margins, and various line and transmission values for a specific date. It provides a comprehensive overview of the power system's operational status during the specified time period.

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101630NSEB (NSPI) IR-1 to IR-17 1 passage

Request IR-10:

Request IR-10: - Reference page 18 of the report. - 70W High Street "Rotating feeder outages were initiated at 70W High Street to avoid overload - conditions reaching the protection limit for transmission line L-5545:" … "At 10:41, it was...

AI summary Request IR-10 seeks details on Transmission Line L-5545's capacity during a January cold-weather event, temporary solutions to avoid rotating outages, timeline of actions taken since the issue was identified, and changes to protection settings in 2023. The report references a proposed new substation and adjusted protection settings post-2023.

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