County annual report · FIPS 25019
2021 Nantucket County, MA Power Outage Report
In 2021, customers in Nantucket County, MA went without power for an average of 23.4 hours, a total of 16K customer-hours (Massachusetts average 7.4 hours). That ranks 3rd worst of 14 Massachusetts counties and 362nd 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 Nantucket 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 07:45 | October 27, 2021 22:45 | 15h | 1,886 | 1,831 |
| 2 | July 2, 2021 04:00 | July 2, 2021 07:45 | 3h 45m | 1,306 | 1,087 |
| 3 | May 17, 2021 02:30 | May 17, 2021 06:45 | 4h 15m | 1,120 | 2,464 |
| 4 | December 10, 2021 09:30 | December 10, 2021 13:00 | 3h 30m | 1,105 | 3,868 |
| 5 | January 8, 2021 22:45 | January 9, 2021 00:15 | 1h 30m | 1,097 | 741 |
| 6 | November 12, 2021 22:45 | November 13, 2021 01:00 | 2h 15m | 669 | 1,286 |
| 7 | May 25, 2021 13:30 | May 25, 2021 18:30 | 5h | 222 | 464 |
| 8 | August 4, 2021 23:00 | August 5, 2021 00:30 | 1h 30m | 205 | 267 |
| 9 | September 22, 2021 15:15 | September 22, 2021 20:00 | 4h 45m | 159 | 524 |
| 10 | August 11, 2021 08:00 | August 11, 2021 12:30 | 4h 30m | 136 | 170 |
Outage episodes by size in 2021: 12 reached 100+ customers, 5 reached 1,000+ customers, 0 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 Nantucket 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 |
|---|---|---|---|---|---|
| Massachusetts Electric Co | 2021 | 7.9 hrs | 1.26 | 1.6 hrs | 0.94 |
| Nantucket Electric Co | 2021 | 73 min | 0.62 | 56 min | 0.54 |
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 ÷ 680 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. Nantucket County has data for 2015–2025.
Cite this report
MassOutage (massoutage.com), Nantucket 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/nantucket-county