Topic:"Unplanned Outage" in M12707

Outage Restoration Profile: Metric Result Unique Customers Impacted 44,223 Customer Interruptions 56,114 Total Customer Hours 235,134 Event Start Time Dec 3 04:02 Event End Time Dec 3 18:21 Main Regions Impacted Valley, Northern, Halifax

AI summary The outage restoration profile details an event that impacted 44,223 unique customers, resulting in 56,114 customer interruptions and 235,134 total customer hours. The outage occurred between December 3, 04:02 and 18:21, primarily affecting the Valley, Northern, and Halifax regions.

1 1 1 1 1 1 // \ 5 Zone Date/ Time Weather Station Direction (Degrees) Max Wind Gusts (km/h) Temp (°C) Cause Sub-Cause Description Customers Impacted Duration (Hours) Valley 12/3/2025 5:09 Greenwood d 20 31 31 1 Tree Contacts Falling Trees...

AI summary The document presents a table detailing several power outages in Nova Scotia on December 3, 2025, caused primarily by heavy snow accumulation leading to falling trees contacting power lines, and one instance of equipment failure due to strong winds. Each entry includes the zone, time, weather station, wind conditions, temperature, cause, sub-cause, description, number of customers impacted, and duration of the outage.

Customers Restored within X hours of Storm Onset Valley % Within 6 Hrs 19.40% Within 12 Hrs 77.38% Within 24 Hrs 95.56% Within 48 Hrs 100.00% This table represents the percentage of customers restored within 6, 12, 24, or 48 hours of the s...

AI summary The table shows the percentage of customers in Valley restored within specific timeframes after a storm, with 95.56% restored within 24 hours and 100% within 48 hours. The average restoration time was 14.47 hours.

Adverse Weather Cause of Outage (CHI) \ elapsed time from first outage event to restoration of last event

AI summary The document includes figures and images related to the cause of outages, specifically focusing on adverse weather as a cause of outages (CHI), and includes a note about elapsed time from the first outage event to the restoration of the last event.

Outage Summary: Customers Impacted: 4,359 Customer hours of interruption: 6,883 Full Restoration\ : 32.2 Hours

AI summary An outage impacted 4,359 customers, resulting in 6,883 customer hours of interruption. Full restoration was achieved after 32.2 hours.

SECTION 5: COMPARISON TO SIMILAR OUTAGE EVENTS - The December 3, 2025 weather event was similar to other heavy snow accumulation events experienced in the province. - As with past storms (such as December 13, 2022) involving heavy, wet sno...

AI summary This section compares the December 3, 2025 weather event to previous heavy snow events, noting that similar outage patterns occurred due to tree contact with power lines. Heavy snow accumulation and light winds contributed to outages and restoration delays.

- In both December 3, 2025 and December 13, 2022 events, only a few regions experienced significant impacts, while the remaining regions saw minimal disruption. Event December 3, December 13, 2025 2022 Customers Interrupted 56,114 48,944 C...

AI summary Two significant weather events occurred on December 3, 2025, and December 13, 2022, causing power outages in Nova Scotia. While only a few regions experienced significant impacts, the majority saw minimal disruption. The number of customers interrupted and the hours of interruption varied between the two events.

NON-CONFIDENTIAL 1 Request IR-4: 23 2024) shows the system automatically restored service to an average of 61 percent of 24 impacted customers during fault events, avoiding 14,484 customer interruptions and 25 35,643 customer hours of inte...

AI summary The document discusses outage events attributed to equipment failure, focusing on failure rates by asset class, age profiles of failed assets, and preventative maintenance history. NS Power explains that failure rates for specific storms cannot be calculated due to lack of reference points and that age profiles for most distribution equipment are not maintained.

(b) Of the 56,114 customer interruptions experienced over the December 3 Major Event Day, a breakdown of the customers that experienced outages lasting more than 24 hours is below: Region Customer Count of 24hr+ Outages Cape Breton 182 Met...

AI summary The document provides a breakdown of customer outages lasting more than 24 hours during the December 3 Major Event Day and requests an evaluation of field resource utilization during the event, including crew deployment, time intervals between outage detection and dispatch, and productivity indicators.

multiple outage locations within a given area simultaneously or provided with grouped assignments to support situational awareness, travel planning, and safe access, rather than being dispatched on a strictly one‑outage‑at‑a‑time basis. As...

AI summary NS Power does not track outage restoration metrics on a per-crew-hour basis during storm events due to the complexity and variability of outages. Crews are assigned grouped tasks across geographic areas, making individual productivity metrics unreliable. Detection-to-dispatch timing is also not consistently recorded during large-scale outages.