County annual report · FIPS 25007
2021 Dukes County, MA Power Outage Report
In 2021, customers in Dukes County, MA went without power for an average of 13.1 hours, a total of 273K customer-hours (Massachusetts average 7.4 hours). That ranks 4th worst of 14 Massachusetts counties and 635th of 2,974 nationally.
Compared with MA, the US and 2020
Coverage line is EAGLE-I's share of Massachusetts customers tracked each year.
Biggest outages in Dukes County, 2021
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | October 27, 2021 04:45 | October 28, 2021 15:30 | 1d 10h | 13,854 | 185K |
| 2 | November 3, 2021 12:00 | November 3, 2021 12:45 | 45m | 4,607 | 1,154 |
| 3 | October 28, 2021 20:30 | November 1, 2021 07:30 | 3d 11h | 3,240 | 73K |
| 4 | July 16, 2021 20:45 | July 16, 2021 22:45 | 2h | 1,874 | 1,090 |
| 5 | July 4, 2021 22:15 | July 4, 2021 23:45 | 1h 30m | 1,149 | 1,345 |
| 6 | November 26, 2021 15:00 | November 26, 2021 15:30 | 30m | 988 | 251 |
| 7 | December 16, 2021 12:30 | December 16, 2021 14:00 | 1h 30m | 673 | 239 |
| 8 | January 4, 2021 08:45 | January 4, 2021 14:45 | 6h | 533 | 1,868 |
| 9 | February 7, 2021 20:30 | February 8, 2021 14:00 | 17h 30m | 532 | 1,413 |
| 10 | September 12, 2021 17:30 | September 12, 2021 20:30 | 3h | 489 | 247 |
Outage episodes by size in 2021: 17 reached 100+ customers, 5 reached 1,000+ customers, 1 reached 10,000+ customers.
Utility reliability filed with the EIA
SAIDI (average outage time per customer) and SAIFI (average interruptions per customer) that utilities serving Dukes County reported on EIA Form 861 for 2021, or their most recent earlier filing. Utility-wide figures, not county-specific.
| Utility | EIA year | SAIDI | SAIFI | SAIDI excl. major events | SAIFI excl. major events |
|---|---|---|---|---|---|
| NSTAR Electric Company | 2021 | 10.7 hrs | 1.10 | 76 min | 0.73 |
About this data
- Outage figures come from DOE/ORNL EAGLE-I, which records customers out by county every 15 minutes. EAGLE-I tracked about 99% of Massachusetts's customers in 2021; utilities it does not see are not counted.
- Hours per customer = outage customer-minutes ÷ 20,864 customers (ORNL modeled county customer count), including major storm days. It is comparable across counties but is not the SAIDI a utility files.
- An outage event is a continuous stretch with customers out; counts at 100, 1,000 and 10,000+ use its peak.
- Years loaded: 2015–2025. Dukes County has data for 2015–2025.
Cite this report
MassOutage (massoutage.com), Dukes County, MA annual power outage report, 2021, data as of Oct 3, 2026 02:41 UTC, sources: DOE EAGLE-I (https://eagle-i.doe.gov/); EAGLE-I modeled customer counts (MCC) (https://figshare.com/); EIA Form 861 (utility reliability) (https://www.eia.gov/electricity/data/eia861/). https://massoutage.com/reports/2021/massachusetts/dukes-county